Canon FD lens hood sticky mount

[Deleted member 88956]

Referring to the bayonet mount Canon lens hoods of the past in FD lenses. These hoods have bayonet mount, which I always liked in the idea department. Older hoods had metal parts, then replaced with all plastic with some light colored inserts, apparently to help "lock" the hood in mounted position. In 3 out of 5 hoods I have, these inserts are clearly in a state of "decomposition" and leave sticky residue on the lens' ring every time they are mounted. It appears the problem is well known and linked to the material Canon used.

I doubt there is a fix, but doesn't hurt to ask. Has anyone found a way to get this addressed, short of switching to a screw in hood?

 

[AgX]

Canon used a plastic that turns into a brittle, wax-like material. Seemingly the same material they used as caps for the hubs at their flashlights.

There are several approaches possible for the hoods. From metal leaf-spring to spongy material, substituting the decayed studs.

 

[gorbas]

I run to similar problem with Canon FD metal hoods. By chance I have ~1.45mm thick sheet of soft milky plastic. Used 5mm leather punch and then halved discs with heavy duty razor. Cleaned and replaced "decomposed" ones with replacement. It works! For how long, I'm not sure? But it was easy project.
For plastic hoods most likely I will use thinner plastic, something similar to credit card thickens. For those, tricky part is to clean gunk deep in the grooves of the hood.
Good luck!

 

[gorbas]

Please let me know if you find right tool for cleaning plastic groves? Most likely some dental tool with L shape end will do the job?

 

[AgX]

The standar tool for such would the old wooden toothpick soaked in solvent, but you might try miniature inter-dental brushes.

 

[Deleted member 88956]

Thanks guys, good to know the surgeries of this kind have been done with success. Will give it a go.

 

[gorbas]

Witold, I finally had a time to tackle plastic hood issue. Cleaned gunk from grooves. Could not find proper plastic material with thickness of ~1.30mm so I used SIM card leftover 0.7mm thick. Used 7mm punch and halved circles. Pushed half circles in the grooves with flat end down. It works!

 

[Yeeski]

https://www.photo.net/discuss/threads/loose-canon-fd-lens-hood.485873/#post-5130108

 

[Deleted member 88956]

Witold, I finally had a time to tackle plastic hood issue. Cleaned gunk from grooves. Could not find proper plastic material with thickness of ~1.30mm so I used SIM card leftover 0.7mm thick. Used 7mm punch and halved circles. Pushed half circles in the grooves with flat end down. It works!

Great tip thanks.