FWIW $65 80 mm USSR optical flat on ebay

I thought some of you might be interested.

I just received a pair of these in immaculate condition and packed incredibly well.


Shipping took 5 weeks.

@rhb If you need to translate the documentation for these plates - write, i will help it any way i can.

That's very kind of you. Here's the certificate from one.

I bought a 3rd so I can make 3 way comparisons. Plus a few others ;-)

I'm rather stunned to have these at the price I paid. I've wanted an optical flat, but not willing to spend several hundred dollars on one.

GRADUATION CERTIFICATE (this is literally translated, in fact it would be more accurate to say "final documentation")
PI PLATES (not 100% sure, but it seems to be P - flat, I - interference)
Diameter 80

1. Verification results

The flatness tolerance of the working surface is 0.3 interference fringes.
Local deviations from the flatness of the working surface 0.1 of the interference fringe.

2. Complexity

The kit includes:
1. Plate
2. Case
3. Graduation certificate
4. Technical description and operating instructions

3. Acceptance certificate

Plate PI No. 5927 corresponds to the 2nd accuracy class according to GOST 2923-75 (Soviet / Russian standard), recognized as serviceable.

4. Manufacturer's Warranties

rhb said:

I'm rather stunned to have these at the price I paid.

Click to expand...

Oh yes, we have a bunch of remnants from the USSR here at the price of scrap metal. Things like machine tools can be scrapped, so they are always in price, and precision meters, etc. often just go to landfill. In Ukraine, the situation is about the same. Before the annexation of Crimea, it was possible to buy something to Ukraine from Russia without any problems, or vice versa.
The Union, it seems, made so many measuring instruments that they should have been enough to restore industry after the Third World War ....
If you need something else - write, I can say the name of the device according to the description (maybe ) etc.

That's the same Ukranian seller I bought my optical flats from early this year. Both showed up in pristine condition and as far as I can tell meet their specs. Mine were bought right before the latest Russian invasion, and shipped right after. Took a little while to get out of the country (go figure) but made it here pretty quickly after that. Solid communication when I had some questions and a great product. Also good packaging. Glad to know they're ok and still operational.