I got a big brass plate on my Canon TV Lens 50 mm / f0.95 how do I get it off?!

I

isakb

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Hello!

I have come across a Canon TV Lens 50 mm 1:0.95 (no101199).

However it has been used in some sort of medical equipment and it came in a metal barrel so to speak. I Managed to strip away this metal casing but the lens sits in a brass plate which I do not know how to get off. So I was wondering if anybody has come across this before and how you do to remove it? It is 4 visible screws around the back glass that is screwed in to the brass plate (from above) is this something I can drill out to get the brass plate off? I Tried cutting it from the sides but couldn't get all the way thru because the lens was in the way 🙁



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Interesting problem 🙂

From the back, remove the span ring, take the optical barrel out. Then disassemble the focus mount from the front until you see the screw heads.

Note that I've only had Canon 50/1.4, 1.2 and 1.5 apart, they were all pretty identical, and for those the above would work. Never touched a 0.95.
 
If you are not sure what you're doing, bring it to a camera repair shop and have them remove it. Better to spend a few dollars and make sure it's done right without damaging the lens.
 
If it's anything similar in design to the Canon 50mm 1.2 lens, this might be of help.

It might be that the notched ring in the back of the 50/1.2 is replaced with the flat metal ring in the back of your 50/0.95.

I would try to unscrew that ring using the rear of a foam mouse mat or something similar. If it works, you should be able to remove the whole optical block and aperture assembly from the focus mount in one go, and the screws that hold the focus mount to the brass plate would be exposed instantly.

I hope that makes sense? I'd like to see the successful approach once you find it! Good luck!
 
Joe,

our new member likely cannot identify the kind of camera it should go onto since it's mounted on a fat brass plate that does not fit any camera.

Seems to me the Canon forum would be the next best thing, since it should not go into the lenses and optics forum either.

Or, can we please have an 'unidentified mounts' forum? :angel:
 
As best I can tell from the pictures, the four screws may be Torx headed screws. If so, just get the matching size Torx tipped tool and unscrew them. If the screws don't have Torx heads (I can't be sure from the pictures), then obviously you can forget this suggestion.
 
Wow. Looks like Torx, or rivets. I haven't taken apart a Canon lens, but, there are some screws that need to be accessed from the back. This plate may be covering them.



Vick
 
buzzardkid said:
Joe,

our new member likely cannot identify the kind of camera it should go onto since it's mounted on a fat brass plate that does not fit any camera.

Seems to me the Canon forum would be the next best thing, since it should not go into the lenses and optics forum either.

Or, can we please have an 'unidentified mounts' forum? :angel:
Click to expand...

it says canon on the lens...
 
The span ring can be seen in your third picture.

Don't think these are torque screws, looks like tips of screws screwed in from inside the focus helix.
 
Interesting modification. Looks like the lens was disassembled in order to mount it into the brass "recessed lensboard". You could take it apart and get it out from the front? Or maybe have a machinist drill out those four screws holding it in from the back.
 
Drill out the screws from the bottom and lift it out.

Have you tried just twisting the things that lock the lens in and removing it?

It might be very simple.
 
Nokton48. I have access to a metal workshop so I probably take it there next week and see if they can help me drill out the screws. I wouldn't know where to start dissemble it from the top, do I need some special tools or can it all be done by hand?
 
Probably neater and safer to take it apart, it dosen't require any special tools. Have a photo repair shop do it. Drilling it out creates a lot of mess (use a vacuum while drilling) and there is a possibility of damaging something.

Lens is worth alot of coin, me, I would take it to a photo repair shop. If it's a "TV" lens mount, Canon did make an adapter to turn it into a "C" mount. Then it will fit right onto a Sony Nex, or Olympus 4/3rd's, by usng the proper generic adapter. That would be fun.
 
Are you certain there isn't a Canon lens mount riveted or screwed to that brass plate? It normally mounts with four screws. Have you tried sliding the lens release lever on the side of the lens? (Shows in first photo.)

Of course maybe they glued it together.
 
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