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- เผยแพร่เมื่อ 14 ก.ค. 2018
- This Mamiya-Sekor C 1:3.8 f=127mm for Mamiya RB had some Shutter problem, and it was because of old sticky grease in the advance and shutter gear, I clean it with some Isopropyl-alcohol 99% and relube very, very little on the gear ring, and the lens was back to working order.
To disassemble the lens, you need some tools:
This is the type of the rubber tool I use from Amazon:
www.amazon.co.uk/Camera-Repai...
Those are the cone rubber tool to unscrew the lens name plate and the lens element's:
www.amazon.co.uk/Japan-Vacuum...
This is a adjustable wing compass divider from Amazon, I file and grind the tip's to fit in the nothes to unscrew the lens elements or name plate:
www.amazon.co.uk/Adjustable-D... You will also need some JIS crosshead screw driver's it means, JIS0, JIS00, JIS000. I use the German WERA. NOTE: Philips crosshead screwdriver is NOT the same as JIS crosshead screwdrivers, so ONLY use JIS crosshead screwdriver's www.amazon.de/JIS-Typ-S-Schra... www.amazon.co.uk/Moody-Tools-...
My friend, using young people jargon, "You are a beast~" - I have been able to fix my Ritinette IIb, and remove fungus from my Mamiya 80mm 2.8 by following your videos. Very to the point and educational. I wish I could spend a week at your shop just absorbing knowledge. Not too many young ones are willing to learn this trade nowadays to carry on repairing our valued analog camera equipment. Thank you for what you do and teach.
Without Your help, I wouldn't even start, but today, I fixed my shutter. Thank for this tutorial!!!
I have had to repair so many lenses by just going in blind; thank you so much for such a great resource.
This is fantastic, thanks for posting this very detailed video. Your calm and thorough walk through is most impressive!
Thank you very much for doing such videos ! My 180mm is now back to business and working like a charm !
Thanks a lot mate, i was struggeling a with the rear lens element and almost give up. Your video showed me how tight it can sit, even with solvent. Great job.
Thank you. Based on your video I was able to fix my Sekor C 127mm.
Muchisimas gracias desde Buenos Aires, Argentina. Con tus conocimientos arreglé mi lente Mamiya 90 mm f 3,8 que es muy parecido al 127 mm. Gracias nuevamente!!
Great work, wow... so many rubber tools
Hello and thank you a lot for this detailed video, i fully repaired my lens thanks to this !
for real your resource is invaluable!! you must have a backup in case of anything happening, this information is precious!
Many thank's, and yes I have 3 backup's of all my video's, just in case of something happen.
@@mikeno62 blessings to you!
@@mikeno62 happy new year, by the way!
Excellent thank you!
Mamiya RB is a very popular camera these days. They are getting old and will need maintenance and repair.
Thank's Jon, I will make more video's about the Mamiya-Sekor C 1:3.8 f=127mm, it will be about the aperture blades and the shutter blades
I was able to repair my 90mm C using this guide. It's incredible people with your knowledge post detailed videos like this one.
A few hiccups & solutions:
Getting the nameplate off: couldn't get it off with a rubber tool, which was just slightly too slippery. I cut open a latex glove and pressed that in-between to add additional friction.
Getting the element back on around 1:28:00: you have to move the mirror up mode, this prevents it from fully falling down. as shown in the video you also have to slightly touch the shutter cocking mechanism, it clicks into place.
Again, THANK YOU.
That's great Zeno, and thank's for the extra info :-)
Thank you so much for a wonderful video. My lens is now like new 😁😁😁 this is another of your video which help me. Thank you 🙏
I’m happy it could help you 👍😃
Love the amount of detail in this video. The problem of the shutter was a lot more basic than I expected. The ring on front was indeed just a Depth of Field scale. It's a bit fancy for one, on the Sekor Z lenses it's just a rubber ring you slide around instead of the fancy hidden ring.
Thank's Jan, yes the shutter look's more complicated than it is, and the repair manual do not tell everything about how to disassemble/assemble and adjusting the shutter.
I will make more video's about the Mamiya-Sekor C 1:3.8 f=127mm, it will be about the aperture blades and the shutter blades.
@@mikeno62 looking forward to that video
Fantastic, thank you for documenting.
Hi Mike thanks a lot for the tutorial, It helps a lot. from korea. you are the hero. I also had same problem but I haven't started to fix. but sooner i will try
Great! Take a lot's of picture or make a video during the process so you have a kind of a backup just in case.
Gran trabajo. Muy agradecido.
Thx a lot! My shutter had the exact same problem
Mike,
I just came across your channel. Absolutely amazing attention to detail. You had briefly mentioned a lubricant with teflon. What was the name of the product?
Thank you so much for these videos! You are a real treasure to the film community!
Could you tell me, does this cleaning and lubrication of the shutter mechanism also fix inaccurate shutter times?
I have a 127mm were the times are OK from 1/1 to 1/8. 1/15 & 1/30 are a stop longer and the faster times are actually around 1/15. I also have a 180mm that is behaving similarly. I am wondering if the steps you showed could also fix my shutter issues?
Hi Mike, I have a Sekor 90mm that I successfully opened (and cleaned fungus) by watching your other videos, thank you! But unfortunately the shutter was not working. I watched this video to try figure out what was wrong, and hoped that it too was just dirt.
After carefully looking around I realised that the thin cable seems to be broken - it is the longer one you check at 1:15:29.
My question is, is this repairable, or should I sell it for parts? Maybe I can send it to you for your channel! It was included "as is" as an additional lens to a RZ kit I purchased, so I am not really losing out.
Thank you so much for this precious resource - I have learnt so much and giving old lenses a little love is so satisfying!
Hey there Mike ! Thanks for the detailed video, it really helped me go through the dissasembly... My problem is that while the shutter kinda works, when I try to fire the shutter just stays open till the end of the expected shutter speed instead of closing - opening up- closing.... Would you by any chance know what's the problem there ? It's obviously in the shutter mecanism itself but i cant seem to find anything visibly faulty...
Thanks again ! :)
Hi Léo, I just repaired my lens and faced the same problem, the solution, in the end, was super easy. (Go to the Video to Minute 59:31 and stop it! ). There you can see the mechanism, which is opening the shutter when cocking it. As you can see, there is a small spring (touching the black "bump" closer to the centre of the lens) on the left-hand side. which should usually close the shutter again after cocking (before firing it). In my case, this small spring was not properly attached to the mechanism and therefore I had exactly the same problem. If you do not understand my explanation, send me a message, then I will send you a picture of the part that I mean. Greatings Dennis
Ok.więcej takich
Mine has the shutter open until the release is pressed, and it instantly closes (at any speed, it never actually opens for the picture, only for the mirror)
I just received a 90mm with a stuck shutter. The tiny pin you press in to release the shutter is sunk into the body of the lens. It can be pressed, and the shutter arms advanced halfway, but it does not fire or go further. Any advice? I intend to pull it apart anyways, just curious if I need to get all the way to the shutter or if the pin is the issue.
Do you know, or maybe tried, if the front/back element can be disassembled? I mean not only take it out of the lens’ casing but taking out each of the glass parts. For example to clean fungus in the inner side of the element of the lens. Thanks!
Hi, a late answer:
do you refer to the last element? This consists of 2 cemented lenses glued into the barrel and additional fixed by the bent metal border. If the fungus sits between the lenses, you need to seperate the cemented lenses, clean the surfaces and recement it. But that's a difficult task where you need special knowledge and tools.
Mike you are a magician but honnestly this video doesn t make me confident to disassemble it ! It’s not your fault at all but how complex these lenses with internal shutter are !!! When I compare to the 645 ones which are probably the more simple lenses to service these rb67 are a nightmare :(. Fantastic job on your side anaway but really for professionnal only :).
I can see what you mean, it's just like in a way disassemble a clock, great puzzle :-)
@@mikeno62 true that an « internal” shutter looks like a clock mechanism. So I will buy my rb67 lens working :).
Hello! I also have some issues with my Sekkor 50mm f4.5 :) I thought about trying to fix it myself, as it sometimes work according to what shutter speed I select, other times not, but it looks so complex. I was wondering if you are offering any repairs service because I also live in Denmark :D
Hey Mike, thanks a lot for this great video. It helped me out a lot !!! One question, do you have a video that shows how to adjust the shutter times, of a SEIKO shutter, if they are of? Greetings from Munich, Dennis.
Thank's, when I have the time (I'm busy at the moment..) I will go deeper into this shutter and take it apart into the shutter blades and the aperture blades and figure out how to make the adjustment, and of course make videos about it. It's on my To Do list.
Hi i have a giant problem and you can maybe help me! I had the same sticky problem so i did the repair. Everything is working fine but when i place the lens on the camera the shutter is closing and running internaly but sometimes it will not open again during the exposure time. It stays closed for example at 1 second. Can you help me?
Hi (Jeg er også dansk :-)) I have the same lens, but it looks to be a different / newer shutter mechanism. Do you happen to have any documentation for the newer version of the shutter?
Previous owner tried to fix the shutter but failed and i think he put some parts wrong, and smeared the shutterblades in oil - total nightmare. I have cleaned the shutterblades from oil and reassembled the blade assembly, but the slow speeds seems to have stopped working and the shutter seems to fire at same speed, no mater the setting. Any advise og video/pictures would be a great help! på forhånd tak :-)
The slow shutter speeds works again, i missed to load a small spring - now the remaining problem is that when the shutter is fired, it does not close - it just stays open for the given shutter time and then closes - What am i missing? :-)
I'm planing to make a video about this lens because I got one for free, with aperture problem's (a small pin fall out...).
Are you in business ? Have a Zenzanon-PG lens with a sticking SEIKO shutter. Would love to have you fix mine too.
Sorry, I do not have repair service.