Thread pitch of 34mm filters for Canon RF

[awilder]

Anyone out there that knows the thread pitch Canon used for 34mm filters for their RF lenses? I've got a 100/3.5 RF with filter attachment size of 34mm. I tried a Kenko 34-37mm step up ring that I think is 0.75mm pitch, but it fails to screw in fully because of thread pitch diffference.

 

[Kim Coxon]

Don't quote me on it but I believe it is 0.5 pitch.

Kim

 

[laptoprob]

I have two 34mm UV filters, a B+W and a no-name that fit perfectly...
I will try to measure the pitch tonight.