Thanks for the vid it was very useful. On my copy the front lens ring was not glued and I got it off by cutting a large soft drink bottle in half near the neck to produce a funnel. I then kept reducing the size of the funnel with a pair of scissors until the opening just fit around the lens first ring. I then used this as a friction tool to unscrew the first ring. I did not have lens tools so I bought a child's tooth brush with a sucker on the end and used a long screwdriver to unscrew the rings inside the lens.
I have a canon 70-200mm f4 usm lens that has fungus in it. I'm very scared to disassemble it but i would like to know how to go about doing it myself. Do i follow your steps to clean it or is my lens more complicated and would i need to have the tools you used in the video?
Hi Robert You can not use the rubber tool's i use in my Sigma video, because the Canon lens is built in a different way, the Canon 70-200mm f/4 is assembled with screw's shims and small plastic parts. The helicoid's is working like most of the new lenses, they are made of Aluminium or plastic and sometimes Brass. Here you can get a Parts list for your lens, you search here at this website: elektrotanya.com/?q=showresult for Canon 70-200mm f/4 parts list. I think you can figure it out, BUT take care NOT to disassemble too much that is not necessary and take a lot's of photo of the process, so you have a kind of backup of what you came from. Put the things in groups that they belong to, it will make it easy'er. cheers :-)
No Rick, because the front glass is only a simpel coated glass with NO magnification, i just left it out and instead put in a lock ring so the real front lens element would stay in right place, and it actually works fine.
Awesome! I came across your video because I have a Pentax 500mm/4.5 that has a bad case of fungus and needs to be disassembled and cleaned. I'm hoping mine will be a lot simpler than yours, but I still haven't started. I need to buy or build some sort of spanner wrench. I actually have an idea in mind to build one from some scraps of oak I have in the garage--we'll see.
I did the same with my 400 APO and end up with a ruined front thread ring. However, I replaced it with a threaded ring from a cheapo 72mm lens filter. Hope this may help.
I have the same lens and I actually like to remove the front element which I think is just a UV filter with almost no coating. How did you remove it? Its retaining ring does not have notches to fit a spanner wrench. Also, do you see the difference with and without the front element? The is a pretty sharp lens but not very contrasty and I suspect the front element may have something to do with it.
Rick Rose I demolished the final retainer ring, because it was glued on, so the only way for me was to break it gently out.... (as much as i could..)Rick Rose
Aha, I see. I'm going to attempt a disassembly, cleaning, and reassembly of an old Pentax 500mm lens as soon as I find the time and courage. Thank you for posting your instructional videos!
@@mikeno62 The first lens is only a UV glassa or what? I've removed fog from this same objective and i've one now with fungus, but i find again this lens useless for the focus image, what do you think about?
Hi David The rubber tools you can get them here... rover.ebay.com/rover/0/e11400.m1842.l3160/7?euid=0d552ee8035c44e0af6706625ecffd1d&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D151001908497%26ssPageName%3DADME%3AL%3AOC%3AUS%3A3160 The loooooong metal tool is a "walkin stick" or a compass, that i grind so it fits on the retaining ring.
Have you ever tried to clean some of the Canon/Nikon big lens? Big I mean like 400/2.8, 500/f4, 600/f4 etc. These lenses came with very big glasses and may very hard to clean. BTW, very rare info about how to clean them.
Lu Luke I don't yet have the opportunity to clean those big lenses, but maybe some I my photo club will have there big lenses have a cleaning one day, I have cleaned a lot of the old large format lenses, but of course they are not that complicated just like the new ones.
Well Avelino, when i disassembled this lens (or other lens's), i write an arrow in the edge on every lens elements wich direction they should point at, so ALL the lens elements are set back to the right position... I can see your point.., at some place in the film it seems to that i change direction of some of the lens element, but they all sit where they should. The lens actually works good, except for that it is a soft lens, the sharpness is okay so i'm happy, because i got for free :-)
Nice video. Hi folks, does anybody know any link for assembling from back or does anybody know any link to a catalogue parts for this lens, scheme for this lens or also a dissasemble from back article or video? I have dissasembled mine, and a little metal piece jumped (like a "T" shape) and I have no idea where does it fit. :0) Any feedback I'll appreciate. Please, check out this thread to see the images: www.dpreview.com/forums/thread/3884991?page=1
Hi babetooz, here you can get the rubber tools like I have, rover.ebay.com/rover/0/e11400.m1842.l3160/7?euid=0d552ee8035c44e0af6706625ecffd1d&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D151001908497%26ssPageName%3DADME%3AL%3AOC%3AUS%3A3160
Thanks for the vid it was very useful. On my copy the front lens ring was not glued and I got it off by cutting a large soft drink bottle in half near the neck to produce a funnel. I then kept reducing the size of the funnel with a pair of scissors until the opening just fit around the lens first ring. I then used this as a friction tool to unscrew the first ring. I did not have lens tools so I bought a child's tooth brush with a sucker on the end and used a long screwdriver to unscrew the rings inside the lens.
Interesting and useful. Even more so if i knew how to take it apart. Have recently acquired sticky one with what looks like water vapour in it?
Can be any fine lens adjusting for optics?
Where your got spanner lens like that???
How did you stick it back again???
I have a canon 70-200mm f4 usm lens that has fungus in it. I'm very scared to disassemble it but i would like to know how to go about doing it myself. Do i follow your steps to clean it or is my lens more complicated and would i need to have the tools you used in the video?
Hi Robert
You can not use the rubber tool's i use in my Sigma video, because the Canon lens is built in a different way, the Canon 70-200mm f/4 is assembled with screw's shims and small plastic parts.
The helicoid's is working like most of the new lenses, they are made of Aluminium or plastic and sometimes Brass.
Here you can get a Parts list for your lens, you search here at this website: elektrotanya.com/?q=showresult for Canon 70-200mm f/4 parts list.
I think you can figure it out, BUT take care NOT to disassemble too much that is not necessary and take a lot's of photo of the process, so you have a kind of backup of what you came from.
Put the things in groups that they belong to, it will make it easy'er.
cheers :-)
Great video! Do you do maintenance? Please let me know.
Thank's, but I do not have repair service.
Too bad! Took down mine and having issues to put it back together! Sigma not responding and local show charging ridiculous price!
hi love the vid can I ask how long did it take to do from start to finish ??? keep the good work up
As I remember, I spend around 1 ½ hour, but I was because the front glass was really difficult to get off and I have NO (0) repair manual.
Oh--now I see your explanation. Did you come up with a way to replace the demolished ring?
No Rick, because the front glass is only a simpel coated glass with NO magnification, i just left it out and instead put in a lock ring so the real front lens element would stay in right place, and it actually works fine.
Awesome! I came across your video because I have a Pentax 500mm/4.5 that has a bad case of fungus and needs to be disassembled and cleaned. I'm hoping mine will be a lot simpler than yours, but I still haven't started. I need to buy or build some sort of spanner wrench. I actually have an idea in mind to build one from some scraps of oak I have in the garage--we'll see.
I did the same with my 400 APO and end up with a ruined front thread ring. However, I replaced it with a threaded ring from a cheapo 72mm lens filter. Hope this may help.
c62506250 Many thanks for the advise :-) I have many of the 72mm old filters where take the retaining ring from.
Cheers
Kenneth
I have the same lens and I actually like to remove the front element which I think is just a UV filter with almost no coating. How did you remove it? Its retaining ring does not have notches to fit a spanner wrench. Also, do you see the difference with and without the front element? The is a pretty sharp lens but not very contrasty and I suspect the front element may have something to do with it.
So who demolished the final retainer ring?
Rick Rose I demolished the final retainer ring, because it was glued on, so the only way for me was to break it gently out.... (as much as i could..)Rick Rose
Aha, I see. I'm going to attempt a disassembly, cleaning, and reassembly of an old Pentax 500mm lens as soon as I find the time and courage. Thank you for posting your instructional videos!
@@mikeno62 The first lens is only a UV glassa or what? I've removed fog from this same objective and i've one now with fungus, but i find again this lens useless for the focus image, what do you think about?
Where did you get the tools and what are the tools?
Hi David
The rubber tools you can get them here... rover.ebay.com/rover/0/e11400.m1842.l3160/7?euid=0d552ee8035c44e0af6706625ecffd1d&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D151001908497%26ssPageName%3DADME%3AL%3AOC%3AUS%3A3160
The loooooong metal tool is a "walkin stick" or a compass, that i grind so it fits on the retaining ring.
Have you ever tried to clean some of the Canon/Nikon big lens? Big I mean like 400/2.8, 500/f4, 600/f4 etc. These lenses came with very big glasses and may very hard to clean. BTW, very rare info about how to clean them.
Lu Luke I don't yet have the opportunity to clean those big lenses, but maybe some I my photo club will have there big lenses have a cleaning one day, I have cleaned a lot of the old large format lenses, but of course they are not that complicated just like the new ones.
At some time you put someone of the lenses upside-down and could you correct it?
Well Avelino, when i disassembled this lens (or other lens's), i write an arrow in the edge on every lens elements wich direction they should point at, so ALL the lens elements are set back to the right position...
I can see your point.., at some place in the film it seems to that i change direction of some of the lens element, but they all sit where they should.
The lens actually works good, except for that it is a soft lens, the sharpness is okay so i'm happy, because i got for free :-)
Nice video. Hi folks, does anybody know any link for assembling from back or does anybody know any link to a catalogue parts for this lens, scheme for this lens or also a dissasemble from back article or video? I have dissasembled mine, and a little metal piece jumped (like a "T" shape) and I have no idea where does it fit. :0) Any feedback I'll appreciate.
Please, check out this thread to see the images: www.dpreview.com/forums/thread/3884991?page=1
Where your got spanner lens like that???
Hi babetooz, here you can get the rubber tools like I have, rover.ebay.com/rover/0/e11400.m1842.l3160/7?euid=0d552ee8035c44e0af6706625ecffd1d&loc=http%3A%2F%2Fcgi.ebay.com%2Fws%2FeBayISAPI.dll%3FViewItem%26item%3D151001908497%26ssPageName%3DADME%3AL%3AOC%3AUS%3A3160