Cleaning an SLR or DSLR Camera Focusing Screen as Safely as Possible & Why Solvents Ruin Screens
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- เผยแพร่เมื่อ 3 ก.ค. 2022
- This video shows some different techniques to clean an SLR or DSLR camera's focusing screen. Always take care when cleaning focusing screens as they are fragile and prone to damage. Ideally, never touch them with anything. Also, if you have sticky foam on the screen avoid the brush step as that can smear foam into the focusing screen grooves.
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Amazing walk-through! Super informative and now I've added a new skill-set to camera repairs :)
Thank you!
Your videos have been so helpful to me getting into simple camera repairs and maintenance. It's a new hobby for me, so I'm turning to the internet often with questions, and it seems like you have a video with an answer every time i look something up. Thanks!
Thank you!
Very informative! Thank you!
Thank you!
Thank you this was so helpful!
Thank you!
Now that’s really helpful. Thanks.
Thank you!
Thank you - very useful!
Thank you!
Excellent presentation - I own four AE1+P Canon's - just adore these - I also adore the Pentax ME Super and MX
Very nice!
best video ever! thank you
Thank you!
This is great, my FM2 really needed a cleaning
Nice! Definitely worth cleaning up, too. Those are awesome cameras.
Thank you for this detailed tutorial! One time my RB67 focusing screen got "melted" by my own sweat! Luckily it was only a few spots on the corner of the frame; it is still usable.
Oh geez! That's bizarre, must have been a reaction to the salt.
That's why we use gloves when handling optics :)
This is a great video. 👍
Thank you!
I tried to clean mine and I used a cleaning solution rag that I used to clean my lenses and it was also the same solution that I clean my sensor with. In my brand new Canon 90d I had lots of what I thought was sensor dust but after cleaning the sensor it was still visible and aggravating me. So I blew some air on the focusing screen and got most of it off but there was still visibly one or two black dots. So I took my ragging solution to wipe the focus in screen and it just made a mess. Apparently there's a coding or something on it so I took the focus and Screen held washed it with Dawn dish soap and then I can visibly see where I had cleaned it with the sensor cleaning swabs had made light scratches all over it. So now I have a new one on order and I'm going to try to put this back together. Thank you for these videos.
Thank you and that's a bummer about the one you had.
Im a physicist who works with lasers and I know the detrimental effect of solvents on optic coatings (anti reflective coatings and so on) Never thought a camera focusing screen can be "melted" in this way.
Also a tip for everyone: please work with gloves :) our greasy and sweaty hands leave so much marks and from my experience it's a pain in the ass to clean them and leave a spotless lens surface.
Thank you! Good tip about the gloves and one I often forget.
They're only made of plastic for the majority, some are ground glass so are more tolerant but still wouldn't use any solvents on any of them.
I hate wearing gloves when repairing things, as no pair of gloves ever fits well enough for me to have an easy time manipulating objects in my hands, especially small delicate objects. My usual technique is to make sure I don't ever touch optical surfaces after I clean them. I'll hold filters, and in this case the focusing screen, by the edges only, just like we used to with CDs.
I recall a product I saw at a trade show that was similar to a piece of tape that could be placed on an SLR mirror and then peeled off to remove fingerprints and dirt. That tape might do a good job removing gooey foam debris from the fine ridges of a focusing screen too. Just an idea to consider.
Interesting. My only fear would be it pressing dirt into the ridges. Do you have to press it down to get it to stick to dirt.
thank you for this!! Your videos are really informative :)) I have a question though.. I'm restoring a hand-me-down camera but the photos are not coming out focused in the same area I focused it on. No matter what lens I'm using, it seems to be off and will end up focused further back. Is this something I can fix?
Thank you and it is possible, but the difficulty will vary based on the camera. In short, the light from the lens focuses on the focusing screen when the mirror is down and the film when the mirror is up. Your focusing screen is out of alignment. If your images are focuses CLOSER than your intent, then the focusing screen is some fractional millimeter further back from the mirror than it needs to be. If they are focused FURTHER then it's some fractional millimeter closer to the mirror. The further the light travels out of the back of the lens the closer the focus point (which is why focusing a lens closer physically moves the lens elements forward.
Okay, so how do you fix that? You need some really thin shim material. It could be paper, honestly. I used paper tape to fix this issue on my Bronica SA. It depends on the camera you're using how much of a repair you need to do.
So get some kind of material you can use as a stand-in for film. frosted cellophane tape can work in a pinch but is not perfect. A piece of clear acrylic the size of the inner film rails and ground to a textured finish on one side will be better. You want that piece of plastic to mimic the film's placement and plane. So the frosted side faces the lens and then you just tape it into the camera body on the inner guide rails, between the outer guide rails.
Then focus on something easily identifiable using the ground glass on the film plane (a tripod is mandatory here, BTW) and tape your lens fixed into that focus point. Next try shimming the focusing screen until the focused image there matches what's on the focusing screen in your film area. In theory, it should work. It may not be perfect if you're shooting an f/1.2 lens, but you can get it pretty darn close with that method.
I know this is a different thing but i recently got an old dof adapter (jag35) and was wondering if it is bad to use alcohol seems to be actual glass focusing screen thanks for your informative videos almost se3n them all
If it's actual glass, I'd suggest cleaning it like a camera lens instead.
Thanks a lot, that was very useful, but how to know that this or that camera has a removable focus screen or not?
Thank you, Najib! For individual cameras, that info should be online or in the manual. In general, there are two ways to access a focusing screen on cameras with a removable screen: take off the prism or through the lens mount. In the former, removing the prism is an obvious sign. In the latter, cameras with removable screens will have some kind of cradle with a retaining clip in them. They're not always obvious but there will be some way to release a clip or spring so the screen can drop.
Distilled water! Who’da thought? Thank you. I have to rescue some dusty old screens now.
Thanks for the video! I appreciate it. Just a quick question. Do you recommend using latex gloves for handling the focusing screen? Specifically when brushing the dust off?
Thank you and as long as you have clean hands I don't know of a reason to glove up.
Nice Video Great info. David, can you please make a video about Canon FT QL and Canon FTbs (AE1 FX) and other same line models..most often illness, about how pentaprism support foam (with long time), damage and causes corrosion and oxide the pentaprism mirror layer. This problem can be detected if you see the big black spots in the viewfinder. And to fix this you should take a new prism from the donor camera, cause to apply new mirror layer on the prism is very pricy. Again Great video, I am Vietnam war collector, got my Canon FT QL in great shape, but my friend got his FTb and this problem occured, he didnt know that this black spots in a viewfinder were a big red flag...problem.
Thank you! I do have videos on both of those cameras already. I haven't previously included sections in videos on known camera problems (though I do include that section in the ebook manuals I write for select camera models.) That's a good suggestion for a section to add to the videos.
This is the topic of the hour for me at the moment. I found a Ricoh XR7 which I really like more than any K mount Pentax I've used. Problem is the dirt and dark smears on the Focus screen. To remove or replace the Focus screen would entail removing the top plate. I did manage to buy a replacement focusing screen from a Ricoh XR-X which I'm pretty sure is the same, but I don't have to tools to dissassemble the camera. I'd give it a try if i did. I have used rubbing alcohol, but 99.9% Isopropyl which I read was non-corrosive to plastics (ethanol based solvents are the big NO NO), and it doesnt seem to have damaged the screen too much if at all. If I point the viewfinder at a light and look through the lens I can still see the concentric circles extending from the focusing prism. They dont seem to be damaged, but there is just still lots of black mirror foam dirt lodged between them which I cant remove at all
Thank you and good luck! Replacing a fixed focusing screen is a major repair.
This has happened with my Chinon CE4. The only thing I have learned is when you remove that black goo from any fixed screen camera do it with the camera over your head so you are forced to look up to do it and so this goo cannot fall on the screen and I would be tempted to use black felt (self adhesive) or the hairy side of velcro rather than foam. Both materials I have used gaining success and the possibility of history re-repeating is removed in one sweep.
@@markberry2969 Praktica MTL cameras use fabric and felt for light sealing. The felt flattens over time, but it doesn't cause any issues with light sealing.
Hey David, do you know if the focus screen on the pentax H2 can be changed? I would really like a split screen If It’s possible.
Yes but it requires a lot of disassembly. Check with Eric Hendrickson, www.pentaxs.com, to see if he's still fixing them.
Thanks David. So i melted my mamiya 645 screen. It does use split screen focusing. If i use that would my focusing me accurate ?
Ouch. It's probably ruined, unfortunately. I've been there, too, with a different camera. One of my other subscribers, just last week I think, recommended Oleson MAT screens and I think they make one for your camera. That might be the best route.
Can you immerse a focusing screen in distilled water to clean it without dissolving it? I am a newbie and just bought a Pentax K1000 that has gunk from the degraded mirror foam on the focusing screen. I'll likely have to have the screen replaced entirely, but I was just wondering if immersion would be the best bet to get rid of that gunk
You can, definitely, but your K1000 screen isn't removable. If it comes out, there's a bigger problem with the camera.
So I simply went to clean mine due to having dust particles that would not blow off with the blower. And found that a Q-tip left minor scratches all over it. After watching a brief simple looking tutorial off of TH-cam I decided to take my focusing screen out and clean it by hand to see if I can remove the scratches. At this point I used Dawn dish soap and warm water. And that's when I saw that the scratches would not come out. I also went back to look at my camera to see how hard it would be to reinstall for the Canon 90d because there is an extra clip that holds the focusing screen on that is not on a few other cameras and it was at that point that a bunch of other pieces fell out of my camera! So just a warning to everyone. I am very good at fixing stuff especially gadgets and gear and I must say that this was not as easy as I thought it would be and there was parts that were not in any tutorials and now I don't know where to put them back. Unfortunately now I have to take it to a camera shop which the closest one is about 45 minutes away. And I have no idea what the cost is going to be. So just please be careful if you try to do this at home
Yeah, the focusing screens are very fragile.
Hi David! Which screen brand or model should I get for a to replace mine its an ae-1 program
There should be some OEM ones on eBay. I don't know that there was a large aftermarket selection for screens.
For a removeable focusing screen I've had good results with weak solution of sodium percarbonate. Just drop the screen into the bath and leave for five minutes. Let it air dry and a lot if not all dirt is removed with no smears.
I haven't tried that. I'll give it a shot. Thank you!
what would be a weak solution? isnt sodium percarbonate a bleaching agent?
Man, that was a great video. Thanks for the explanation about the working process of the mirror. I wasn't aware and I definitely would have ruined it if I had to go on a freestyle method.
Thankfully, my AE1 Program doesn't have this issue. I will have a look at my OM-1n but I think I'll need distilled water for this one !
Thumbs up !!!
Thank you!
@@DavidHancock I tried to dismantle the 50/1.8 FD mounted on it but it seems that the 2 main haze sources are located within the elements of the 2 doubled-lenses groups while they seem fixed. Is it possible ?
@@Delmonteil unfortunately not, assuming it's on the balsam that joins glass elements.
There is distilled water in your breath! You can gently exhale on a lens surface, and the water vapor in your breath will condense, making it usable to clean the lens. Just make sure not to spit on it (saliva is not just water)!
How do you replace or take out a focus screen on a nikon FG or fg20 ?
I have video manuals for both those models and these should help with that a lot:
Nikon FG:
th-cam.com/video/hwpP_XSYAs8/w-d-xo.html
th-cam.com/video/ZmjCX3OJj4A/w-d-xo.html
Nikon FG-20:
th-cam.com/video/0wPizBq-4y4/w-d-xo.html
th-cam.com/video/5xUVulXu3ns/w-d-xo.html
Hi. I've bought used (but not much) Nikon d3200 from my friend. I haven't been using it much, but when i wanted to take pictures I notced few dust particles in my viewfinder,. I opened the body and used the blower like yours dfrom aliexpress. The point is that the plastic top fel into the body in the corner between mirror and focusing screen.y, but not that hard to make any damage. After that I noticed that one dust particle was gone but other 2 came in. Also I noticed a black tiny spot (like it was made of the top of the marker). I'm not sure if that spot was there before. Anyway, I continued to blow both to the mirror and focusing screen, but without success. The particles and the spot are still there. I can't see any dust on the mirror and on the focusing screen. May I use these cotton ear buds to gently wipe over the focusing screen without taking it out? I don't want to make more harm than it is. Thankyou.
I would recommend a lens brush instead of cotton. I have a video on cleaning lenses that shows what that looks like. They're reusable and great for lenses, too. One thing that you can do is glue the plastic tip into the bulb blower. I did that and it gives the blower a whole lot more force without the risk of the tip popping out.
@@DavidHancock Thank you. I have a brush for lensesthat I got in the chinese set. It is softI, but I don't know the quality and if it can scratch the surface.
@@djhot80 I would expect it's probably fine. A brush is definitely gentler than cotton swabs.
Isn't a cotton swab to coarse for the focusing screen and may damage it? Also it's pretty fuzzy and particles of it may get caught up by the ridges of the rough side? Or will soaking it with distilled water prevent this. Maybe a cleaning swab for digital sensors may be better as those have a smoother surface.
What do you think of using one of those sticky sensor swabs? Those that you also use to remove spots from a digital sensor. They're a little sticky, a little bit like gummy bears
Also I'm weary of a brush, I tried it once and had the feeling it causes more dust than it takes away.
The cotton swab approach, if used to dab and not wipe, is just fine because it's being used to wick up distilled water and dirt, not wipe it away. And a good brush should not leave fibers behind.
The sticky sensor swabs could be a good idea. I haven't tried them and I'm not sure if they would work well. The cotton swab approach came from two of the camera repairmen I used to send cameras I couldn't fix to, and that approach goes back to the fifties or sixties at least. There may, yes, be a better way now, though.
Regardless of one persons video, you should never touch the Fresnel Screen, especially a plastic one with anything, if you need too for some stubborn marks, use a Sable Brush.
Good afternoon. Tell me, please, how can you wipe the mirror in the chamber so that there are no streaks? Is there any coating that can deteriorate when wiping?
Here you go: th-cam.com/video/uUBX-MVYjTM/w-d-xo.html
@@DavidHancockthank you
Oh well, if I only saw this one video let's say 10minutes ago.. I was going a first time repair of a broken camera that I found online. The repair is actually going quite well, but I just ruined a non removable focusing screen (pentax ME super).
I guess I have one more thing to fix and learn now, let's see if I can somehow source a focusing screen.
Oh shoot. I'm sorry to hear that. If you can find a parts-grade ME Super online, that's the best bet for a new screen.
If your grocery store doesn't have distilled water then your pharmacy might? It is used to clean eyes in emergency situations for example. Also battery water from gas station would work too.
Could well. Most grocery stores stock it, but with people drinking (?!?) this stuff lately it seems to be often out of stock at the stores near me. Why anyone would drink distilled water is beyond me.
@@DavidHancock Must be some weird new age social media trend :D
the fun thing about slr cameras is,,,, I know basically how they work since middle school, but 20 years later I'm still finding new things to learn about them. Plenty.
ha I had this old raggedy lens brush from a pentax k3 kit i got a long long time ago, never had much love for that camera so I sold it quickly and recently I got back into photography and got a pentax mx with dusty mirror..... guess what... trusty old lens brush appears out of no where after 6+moves since I last give up photography and cleaned that dirty mirror right up.
I completely melted my focusing screen with alcohol before I knew it was made of plastic. Will it affect picture quality or just view through the viewfinder? It’s already blurry when looking through it.
Ouch. That won't affect the way your camera records images but it will affect your ability to focus accurately. That could affect image quality.
9:26 this part screwed me up so badly when I was cleaning mine. I have a digital EOS, and the shiny side of the focusing screen faces down, toward the mirror/lens/shutter. I spent quite a while trying to put it back together, because it didn't fit with the shiny side facing up. Luckily, Canon has keyed tabs molded onto it, so it can only be inserted in the correct direction. Definitely more anxiety-inducing than I would have liked, because I really didn't want to scratch it. Replacement 400D screens aren't as easy to come by.
So the screen doesn't always have the shiny side facing away from the lens. You have to insert it the right way for you model camera. They aren't all like an AE-1 Program.
Still super grateful for the walkthrough! I now also have this in my bag of tricks for when I have to do things. I was debating about just having a camera shop look at my camera because other tutorials made it seem way too complicated and dangerous.
Also, there is a very easy supply of distilled water available to anyone: it's in your breath! You don't want to spit on stuff, but if you gently exhale over something like a lens, the water vapor in your breath will condense on it, and there are no minerals in the water vapor in your breath. My dad cleaned his glasses lenses this way for as long as I can remember.
Interesting. Thank you! I've not removed screens from a digital EOS before. Curious that it would be installed in that orientation, but good that the tabs help keep it oriented.
@@DavidHancock I didn't think to take it out to clean it at first. I tried with a brush and blower, and then in my ignorance, I tried a lens cleaning wipe (while it was installed in the camera). If I had to guess, I would say that being a common first attempt would be the reason Canon flipped the design.
My camera was made well after inexpensive consumer level SLRs like mine were commonplace, so I would guess there was probably a generation where hobbyists were ignorantly damaging their focusing screens, and Canon flipping the design over and made them less easily damageable when not removed.
Likely I didn't damage mine, and the shiny side is still shiny and scratch-free!
@@DavidHancock being able to take one out and clean it is totally new to me. I had always thought the focusing screen was just molded/etched directly into the bottom of the pentaprism.
no matter what i do or use, i can never get all of the dust off of my focus lens, i have a T7 with a removable lens but there’s always at least some dust left when i re insert it back into the camera, any tips?
Is it showing up on your photos?
@@DavidHancock no, however, i used a sensor cleaner dipped in alcohol to clean the back side of the lens then used a dry one the clean it off. that got about 90% of the dust off but i have to get a new focus lens soon anyways
I did all the things I shouldn't do before watching your video😭😭,it takes me alot of money to rebuy it
Ah dang it. What kind of camera?
Ok.. so i got distilled water and tried to clean the prism again.. and for some reason there were still a few tiny hairs i couldn't clean.. i guess they were stuck deeper in the viewfinder system? behind the other side of the prism perhaps? any idea how to clean those?
When you look through the viewfinder, do they appear to be like black threads or chips that are in sharp relief (they don't appear blurry.) If yes, then those are areas where the silver coating on the prism has begun to fail and there's no fix for that except a new prism.
@@DavidHancock ohhh dang.. yeah they look like black tiny hairs.. very sharp.. altho if I change the diopter on the viewfinder system they all blurry away too.. one of them I was able to "move" around with a wet cleaning swab.. but I couldn't like.. take it out.. I just kept moving it around.. which was kind of annoying lol
When I had my focusing screen out to clean it, I took a few moments to look through the viewfinder without the focusing screen installed to see if there was dust further inside the penta-mirror. I ended up getting dust out of it several times (it took me a few times to put my focusing screen back) because I was checking before putting the focusing screen back. That dust is so good at getting in whenever there's an opening!
@@AlexandarHullRichter yeah.. I did this cleaning a couple of times but now I just give up.. It's so much work and annoyance and dust and hairs just keep finding ways to get in there lol.. as long as it doesn't affect my pictures I'm leaving then there now
I just did the mistake of using rubbing alcohol it has a black spot all over my viewfinder now is there any thing i can do to fix it
Can you get a new focusing screen?
@@janmelantu7490 yess if it is available to deliver in india
Depends on your camera. If the screen is replaceable with other screens, like on a Canon AE-1 Program, no problem. If it's fixed, like on a Canon AE-1, then it really needs a professional repair because replacing a fixed screen is a pretty significant disassembly.
Are all camera focusing screens made of plastic? Or just most? I have an edixa flex and it is shiny like glass on the top
Most. Some very old cameras have glass and many large format camera use glass. I'm not sure about your camera but I would think it's glass not plastic because I think it's a fifties camera and that's older than the plastic used in screens.
My Nikon f has glass focusing screens
As mentioned it depends allot on the camera and when it was made. But even if it uses a plastic focus screen, many still have a glass slip cover especially if they have interchangable viewfinders as glass is by far more scratch resistant than plastic.
How can i do this on a nikon DSLR? same process?
Yes, but I think most Nikon DSLR cameras have fixed focusing screens, so they compress it a bit.
Dang.. i tried cleaning the prism, because i could see some tiny hairs sticking on it.. and i gently tried to swipe them with a cleaning brush... and things got worse.. it all went downhill from there.. tried with a qtip.. and got more hairs.. tried blowing, barely any changes.. tried a microfiber cloth.. and got a ton of tiny tiny hairs on it..
idk what else to do anymore.. all i havent tried was using a fluid of some sort.. any suggestions?
Without seeing it, nope. If you use a cleaning fluid, distilled water is the only thing you should use. And use a wetted cotton swab with it.
@@DavidHancock do i just wet a cotton swab and let it dry? or what do i do if there's like excess drops of water?
im doing it on a nikon d3200.. is it dangerous to use an air blower to blow the little excess water off the prism bottom?
@@Meth0z This video demonstrates the process and I think that's probably the best guidance I can provide. I think this video also discusses air blowers.
Does this method work for the Pentax K1000?
Yes but that screen isn't removable. If you're seeing something black in the viewfinder that looks like tree branches, that's not viewfinder dirt and may be desilvering, which requires a new prism.
@David Hancock Thank you! I had noticed fine specks and an almost translucent streak on the view finder but upon further inspection it turned out that the mirror was dirty and the focusing screen had the streak. I just hope it's an easy fix.
@David Hancock One more question. Is all distilled water created equal or is there a particular brand you find better than the others?
@@LouisNavor insofar as I know, it's all equal.
@@DavidHancock thank you
I have a feeling that the focusing screen in itself is a Fresnel lens, am I right?
Some. It depends on the design. As a general rule with exceptions, the screen itself is ground glass or plastic and a separate Fresnel will be next to the screen. Most cameras after the 50s included either a Fresnel or a ground glass design that did the same thing to reduce the effects of light ray roll of and periphery darkness in viewfinders.
Do the screens really need to be cleaned? It’s just for reflective purposes.
If it isn't dirty, no. But the focusing screen isn't a reflective element. The texture on the screen provides a focusing surface for light through the lens. So when the screen gets dirty or damaged it can affect how accurately the camera focuses.
@@DavidHancock
Got it
I cleaned mine with acetone and it’s fine. I can still see the split circle and the little triangles that disappear when in focus.
That's fortunate. Most of the time acetone dissolves the fine ridges on the screen, which has a meaningful and detrimental effect on focusing.
Cotton sticks are not a great idea as they tend to leave very microscopic dust/fibers. Better is to get a fine "grained" medical gauze and put it on a spatula and moisture in the distilled water.
When blowing it's better to hold the camera so the dust travels down from the focusing screen and not back to it with gravity ;)
Thank you and good points.
Focusing screens a dime a dozen ?,
I just had to pay over $100 for one on eBay, postage included, but the screen itself was $60 US. Great vid though. 👍
Thank you and yeah, some camera screens have gotten very expensive
Well I wish I’d watched this before cleaning my focusing screen with rubbing alcohol.
Ooh. Does your camera have a replaceable focusing screen?
As you requested, one finger up.
Delivered as expected.
@@DavidHancock So, when can we expect the first episode of the manga and anime, 'Steinbark and His Photographic Journey'?
@@ZommBleed Just as soon as he learns to twitch his drew claw and tale a dozen photos of a rabbit.
@@DavidHancock I'm not going to spellcheck that; I know what you meant.
@@ZommBleed LOL
It was too late for me to view this clip, I just damaged my viewfinder by alcohol...😪
Oof. What kind of camera? Is it one that has a removable focusing screen?
same
Very dangerous advice to tell people to stick their blowers into their cameras, even up against the focusing screen: the focusing screen is incredibly fragile and will scratch with even the slightest touch of that nozzle.
And another thing people: when you use your blower always keep the camera mount opening downwards, unlike in the video, as you want the dust to fall out, not in.
Thank you and on the second point, I think the video clarifies that holding it down is important. It's rather hard to record video through a two-inch-thick table.
@@DavidHancock To be clear: I was not trying to critize you, just trying to warn and help others here. Thanks for your videos. :)
@@TimMer1981 Thank you. 😃
Distilled water, is a close and easy as your typical dehumidifier.
I didn't think dehumidifier water was all that clean.
I sure wish I had seen this before cleaning my in-camera focusing screen with rubbing alcohol 🥲lesson learned! Thank you for such an informative video, I will not be making that mistake again in the future!