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.