How To Free Stuck Threads: Two-Part Lens Hood on 500mm CF Lens

[Arthurwg]

I'm trying to free the two-part hood on my 500MM CF Hasselblad lens to insert a drop-in filter. Seems to be frozen solid. What to do?

 

[Dan Daniel]

Get a Rolleiflex.

 

[ags2mikon]

Warm one side and cool the other? Is it the same as the 350mm?

 

[Kino]

Get a Rolleiflex.

Dan's feeling his oats!

Drop the hood into an ultrasonic cleaner with a tiny bit of detergent and see if that will loosen it up.

 

[loccdor]

Rubber band and/or pliers around one of the pieces for grip, then twisting the other?

Be careful you're not like me who tries to turn it the wrong way to loosen it after having an extra beer the night before.

 

[Arthurwg]

Get a Rolleiflex.

I have two. Had three but sold the Wide. Can't get a 500mm lens on either of them.

 

[Patrick Robert James]

Double sided tape on a table and elbow grease usually works. If you don't have any double sided tape you can double over some duct tape or use a thin rubber sheet or a mouse pad. You could also try a jar lid remover if you have one.

 

[mshchem]

350mm and 40mm use the same darn aluminum nonsense. I doubt Zeiss had anything to do with these accessories. I put Vaseline on the threads to prevent sticking, I ended up selling the 40mm (FLE) too heavy and the goofy accessories. Probably an effort to contain cost.

A rubber strap used like a strap wrench is the only thing I can think of.

This was a modern screw up, I have a 1973 Super Wide C, uses a beautiful lens hood that also holds series VIII filters, brass, threads in beautifully as do 1940s era Kodak series VIII brass retaining rings.

 

[Dan Daniel]

I have two. Had three but sold the Wide. Can't get a 500mm lens on either of them.

You are probably not using the right grinding bit on your Dremel to remove the old lenses. You need the structured carbide ones.

 

[Romanko]

1. Hose claps of suitable diameter with some rubber underneath to protect the surface.
2. I successfully disassembled Agfa lenses by using home-made lens wrenches similar to these:

What's the Best Filter Wrench?

A filter wrench will help get a stuck filter off your lens or help you separate two stacked filters.

shuttermuse.com

Mine were made from plywood using a jig-saw.
If you are curious why Agfa, search for Agfa grease.

 

[Arthurwg]

Freezing worked! All is well.

 

[ags2mikon]

You can also use that in reverse if you don't want it to come apart easily. Heat one and freeze the other.