Help: Summicron 40 C hood stuck!

[Cagliostro73]

Hi everyone.
I have just received a very well kept leica CL along with her 'cron. Everything is ok but the rubber hood. It is broken and as i tried to unscrew it the entire lens group moved with it.
I managed to fix everything (or so i hope) but i still cannot get rid of the rubber hood. It seems stuck.
I'm wondering if i'm wrong with something. Is it permanently joined qith the lens?
Any suggestion?
Help!

Thank you!

 

[Ronald M]

You probably need to put a ring wrench on the lens and on on the filter. Consult a repair person.

Never screw in things to tightly they can survive a bomb blast. It is not necessary. For aluminum mount filters, sometimes I will apply a TRACE of silicone paste to prevent sticking. Hardware store, plumbing section.

You might try a little WD40 on a cotton swab applied to the joint, small amounts. Let it sit overnight

 

[silent1]

I have a similar problem, with a yellow filter being stuck on the lens. The main problem here is that my lens is a v4 Summicron which has a detachable head, so when I try to force the filter, the whole lens head begins to unscrew.
Any suggestion on how to get rid of the damn filter?
I'm stuck with shooting black and white for now eheh

 

[Cagliostro73]

Thank You, RolandM.
I have probably the same model as silent1 because the entire head turns around.

I've not screwed it in, I simply received that from e-bay in this shape.
I'll try with the WD40 but i've already looked for a service center in Rome to fix the problem if I would not be able to.

I'll let you know.

Best of light.

To silent1- Roma: dove? Io centro. Buona luce.

 

[Keith]

I have a similar problem, with a yellow filter being stuck on the lens. The main problem here is that my lens is a v4 Summicron which has a detachable head, so when I try to force the filter, the whole lens head begins to unscrew.
Any suggestion on how to get rid of the damn filter?
I'm stuck with shooting black and white for now eheh

Warm the lens by sitting it in front of a heater (not too close) for a while.

Put something solid like a copper based frypan in your freezer for an hour or so ... place the lens filter side down onto the chilled pan surface for a few seconds so that the filter and not the lens is making contact with the chilled surface. It should contract slightly from the lens and that should free it sufficiently to undo it comfortably by hand.

 

[Cagliostro73]

Warm the lens by sitting it in front of a heater (not too close) for a while.

Put something solid like a copper based frypan in your freezer for an hour or so ... place the lens filter side down onto the chilled pan surface for a few seconds so that the filter and not the lens is making contact with the chilled surface. It should contract slightly from the lens and that should free it sufficiently to undo it comfortably by hand.

Great suggestion!!!
I'll let you know.
Thanks.

 

[silent1]

To silent1- Roma: dove? Io centro. Buona luce.

Testaccio.

Ciao

 

[snausages]

Try turning it with as little pressure as possible. Sort of a zen thing, but I've had luck loosening a stuck filter with an exaggeratedly gentle approach...

 

[Cagliostro73]

Hi everybody.
I applied the process suggested by Keith. Unfortunately with no success.
I heated the summicron and then i put it upside - down towards a chilled flat object for some second. Some condensation appeared inside but no way i could not remove that thing. I'm still having hard times to keep the head while unscrewing...
I'll try the WD40, then I'll bring it for a set-up.

Any other suggestion is welcome.
Thank you.

 

[Sonnar Brian]

Usually works for me: a rubber mouse pad to hold the lens, and a slit rubber grommet to turn the filter. Rubber grommets, like from an electronic department to run cables through a box. Cut a strip from a rubber mousepad will also work. I used this most recently for a filter stuck on a 90/2 Summicron with removable optics head.

Really Stuck: I have a set of pliers with a round head. I put the rubber over the rounded head of the pliers, grasp the filter (or hood), and use the mousepad to keep the lens from moving. Got a Nikkor 35/2 AI for $50, stuck filter. Pliers paid for themselves.

 

[silent1]

Usually works for me: a rubber mouse pad to hold the lens, and a slit rubber grommet to turn the filter. Rubber grommets, like from an electronic department to run cables through a box. Cut a strip from a rubber mousepad will also work. I used this most recently for a filter stuck on a 90/2 Summicron with removable optics head.

Really Stuck: I have a set of pliers with a round head. I put the rubber over the rounded head of the pliers, grasp the filter (or hood), and use the mousepad to keep the lens from moving. Got a Nikkor 35/2 AI for $50, stuck filter. Pliers paid for themselves.

Thanks! I was also going to try with pliers and something rubber to hold the lens. I didn't thought about mouse pads though, that's a great idea!

 

[Cagliostro73]

Thank you Brian!
I'll try but I must admit I'm scared to damage the front lens this way.
Great idea to use mousepad and pliers.
Thank you!

 

[Cagliostro73]

Hi everybody.
I tried everything without success...
I hope the lab will remove that ugly thing.
Even the pliers made no effect.
Thank you for all your advices and support!

 

[Keith]

Sorry we couldn't help you more.

Good luck with the lab.

 

[jonmanjiro]

I wouldn't use WD40 on a lens.

Why not just unscrew the front optical group of the lens along with the rubber hood, and then screw the front optical group back in once the hood is removed. It will be much easier to remove the rubber hood if you can get a good grip on the front optical group. You should be able to do it by hand.

Here's a lens I had in pieces last night. Works fine now

Before

After (the lens I disassembled is on the left)

 

[Cagliostro73]

I wouldn't use WD40 on a lens.

Why not just unscrew the front optical group of the lens along with the rubber hood, and then screw the front optical group back in once the hood is removed. It will be much easier to remove the rubber hood if you can get a good grip on the front optical group. You should be able to do it by hand.

Here's a lens I had in pieces last night. Works fine now

Before

After (the lens I disassembled is on the left)

I have dismantled the lens in parts but it seems different from your pictures.

This is the lens dismantled in its main parts.

I grabbed the lower part of it with a champagne plier.

I grabbed the metal part of the rubber hood with another plier then with all my strenght i turned them in opposite directions.

I only managed to turn the F marker around...

I give up.

Thank u so much for your support guys.

D.

 

[Ming Rider]

I had a second hand lens once. Couldn't get the hood off. Then I noticed a thin blue line around the base of the hood. I had seen this many times in the motor trade. They had stuck the hood with Loctite Thread Lock.

If this is the case, the only way you will get this off is to bake the hood mount and lens front (without glass) in the oven at maximum heat for 1 hour. Remove any plastic or rubber bits first. Then GENTLY grip one end in a vice with alloy jaws, the other end with equally padded adjustable pliers and very GENTLY turn.

Alternatively, stick with the hood (no pun intended).

 

[SolaresLarrave]

I had a Vivitar filter stick on the back of the hood of my Hexanon KM 35/f2 lens... and it wouldn't come off. I panicked and cursed... and then, after a number of attempts applying all my strength to the stupid filter, it just came off after a somewhat gentle turn.

Needless to say, I did not keep the filter.

Best of luck detaching the lens from the vestigial hood! Let us know about the results too!