HELP! lens stuck in mount

[LewisGoldstone]

Got a new c7700 pro enlarger with a 50mm schneider lens chucked in. Having not known that the mount can be inserted differently for different formats, I put the lens in the wrong side and now it won't budge, no matter how much pressure I put on it. I've tried freezing it/warming it up but to no avail. Any ideas?

Pic of lens:

 

[Sirius Glass]

Wrap a wide rubber band around the lens and see if that gives you the grip you need.

 

[MattKing]

You may have cross-threaded the lens and mount.

 

[John Wiegerink]

Before you lose patients and damage the lens or the mount or both, do yourself a favor and buy two strap wrenches and you'll be happy you did. These work so slick you'll wonder how you ever got along without them. Where I live there are some home supply and tools stores that sell them cheap, but they can be worth their weight in gold at times. This sounds like one of those times for you?

 

[LewisGoldstone]

You may have cross-threaded the lens and mount.

I'm pretty certain I haven't cross-threaded it, it's sitting flush against the mount.

Before you lose patients and damage the lens or the mount or both, do yourself a favor and buy two strap wrenches and you'll be happy you did. These work so slick you'll wonder how you ever got along without them. Where I live there are some home supply and tools stores that sell them cheap, but they can be worth their weight in gold at times. This sounds like one of those times for you?

Unfortunately the lens has an aperture lever/switch which isn't pictured which would prevent being able to put a strap on it.

 

[John Wiegerink]

I'm pretty certain I haven't cross-threaded it, it's sitting flush against the mount.



Unfortunately the lens has an aperture lever/switch which isn't pictured which would prevent being able to put a strap on it.

Well, you can do whatever you wish, but I'd still get the little strap-wrenches and use them. The little preset lever you talk about is not a problem. It is held on with one small screw right through the middle. Just remove the screw and take the lever off while you use the strap wrench. When finished just put the lever back on. I'm just trying to help you avoid kicking yourself in the behind later on 'cause you buggered up the lens. Hey, I been there and have the T-shirt to prove it. Actually a whole drawer of T-shirts.

 

[mshchem]

Well, you can do whatever you wish, but I'd still get the little strap-wrenches and use them. The little preset lever you talk about is not a problem. It is held on with one small screw right through the middle. Just remove the screw and take the lever off while you use the strap wrench. When finished just put the lever back on. I'm just trying to help you avoid kicking yourself in the behind later on 'cause you buggered up the lens. Hey, I been there and have the T-shirt to prove it. Actually a whole drawer of T-shirts.

Or you could just spend 30 bucks and buy another lens . At this point you got nothing to lose strap wrenches are great . Chain wrenches are even better
Maybe put 2 drops of liquid wrench on the threads and walk away for a couple days . You might try a little heat , blow dryer not torch .

 

[LewisGoldstone]

Well, you can do whatever you wish, but I'd still get the little strap-wrenches and use them. The little preset lever you talk about is not a problem. It is held on with one small screw right through the middle. Just remove the screw and take the lever off while you use the strap wrench. When finished just put the lever back on. I'm just trying to help you avoid kicking yourself in the behind later on 'cause you buggered up the lens. Hey, I been there and have the T-shirt to prove it. Actually a whole drawer of T-shirts.

Away from the lens atm but I can't remember there being a screw, I'll give your idea a try later tonight.

Or you could just spend 30 bucks and buy another lens . At this point you got nothing to lose strap wrenches are great . Chain wrenches are even better
Maybe put 2 drops of liquid wrench on the threads and walk away for a couple days . You might try a little heat , blow dryer not torch .

I'm under the impression that Schneider lenses are worth way more than 30 bucks.

But yes looks like I'm going to need to try some lubrication and some brute force

 

[John Wiegerink]

I think what he was implying was that you can usually pickup another Componon-S very cheap these days even if they are "worth" much more that's the demand price. Brute force will do it, but it has to be very even brute force. Look close and you'll see the screw. Good luck and let use know how it goes, just don't leave us hanginginginginging!

 

[Rick A]

You may need a spanner to remove the retaining ring from the rear of the lens, inside the cup of the plate.

 

[bdial]

A strap wrench will be your friend here. A little penetrating lubricant may help, but if it's threaded straight, and all of the threads are undamaged, what you need most is more force than you've been able to apply, and the wrench will help. A rubber band may work too.

 

[John Wiegerink]

You may need a spanner to remove the retaining ring from the rear of the lens, inside the cup of the plate.

It's just threaded into the lens cone. No retaining ring.

 

[removed account4]

do you have a camera repair shop near you that you are friendly with ?
bring it to them, they will be able to remove the lens

 

[BobMarvin11225]

Strap wrenches are great and they don't scratch the lens mount; I think you'll need just one. After you get the lens off go over the threads with the point of a pencil. The graphite will provide enough lubrication so i won't get stuck again.

 

[LewisGoldstone]

Ok, for the past half hour I've been going at the lens with a strap wrench and it's still not budging. I'm dumbfounded by this. The lens was only in the enlarger for 5 mins before realising that I'd put it in wrong, not like it had been sitting in their for years...

 

[bdial]

You are turning in the correct direction, true? (which would be to the left).
A silly and trivial question, but it occasionally trips everyone up.
Presumably the lens needed only slight force in threading it in? Did it run smoothly with each revolution?

You are sure that the threads on both the lens and the mount were in good condition? Was a lens mounted in the board previously?
Heat may help, but I'm not sure what the best way to get the board hot without affecting the lens. Do you have a soldering iron? Perhaps a clothing iron?

 

[LewisGoldstone]

You are turning in the correct direction, true? (which would be to the left).
A silly and trivial question, but it occasionally trips everyone up.
Presumably the lens needed only slight force in threading it in? Did it run smoothly with each revolution?

You are sure that the threads on both the lens and the mount were in good condition? Was a lens mounted in the board previously?
Heat may help, but I'm not sure what the best way to get the board hot without affecting the lens. Do you have a soldering iron? Perhaps a clothing iron?

I'm turning to the left, yes, and the lens screwed in as you'd expect. I've tried all sorts to warm up the board itself but doesn't seem to make any impact

 

[markbarendt]

Try heating the mount ring with a blow dryer or heat lamp. Have rags or gloves ready so that you don't burn yourself

 

[jeffreyg]

I'm not familiar with your exact equipment but it is possible that the threads are not exactly compatible and are of different metal hardness. When it was screwed in it wedged. You might check with a machine shop to see if they have the equipment to remove the lens. I had the experience of using an aluminum filter adapter with a brass mounted filter and finding it difficult to remove the filter. I only buy bayonet mount filters now.

http://www.jeffreyglasser.com/

 

[LewisGoldstone]

Got my gf to hold the lens with rubber gloves while I used the wrench, ended up moving it slightly then causing a shard of red plastic to pop out so now the aperture ring has stopped working...that's the end of that. Going to have to buy a new mount, if that's possible, and a new lens. Shame as it was a 50mm 2.8, which from what I've read is a nice lens

 

[LewisGoldstone]

At least I got it for free