72x1mm filters - what the ...? :)

Hello friends,

today I picked up a pair of 72 mm Russian filters, yellow and orange - wanted these to put on my Fujica G690. So imagine my nice feelings, when I discovered that Fujinon has a 0.75 mm thread, and the filters are 1 mm! Do you have an idea what these were made for? I understand I should know it for better - my suspect is one from Tairs.

Cheers,
Zhenya

The various MF lenses that take 72mm filters are all 0.75 mm.
I know the Mir 38 is. Even the 88mm filters for the tair 33 are supposed to be 0.75.

Nick Zentena said:

The various MF lenses that take 72mm filters are all 0.75 mm

Click to expand...

That's why I got so impressed with these If anyone can figure out what they are for, I am ready to give it away - I am sure that it's impossible to find those highly original filters if someone wants them badly

Zhenya