Anybody recognize this filter?

[M_alice]

Hello
I have just bought some second hand filters, two of them I can't identify. Round, glass filters in black metal rings (size is 77mm). One looks to me like an ordinary orange filter for B&W, and on the ring 0-2,8* is written. Second looks like a piece od dark glass (UV maybe?) and there is H-4* written on it. Any ideas?

 

[sevo]

The former could simply be O for orange, and the filter factor. Hard to tell what the latter is - "dark glass" sounds like ND (UV is clear glass), but I don't know a H designation for filters (outside astronomy, and there the filter factor would be much higher than 4).

 

[M_alice]

Yes, orange is just standard orange. Like this one
http://www.ebay.pl/itm/Filter-Orang...612798?hash=item230cccf03e:g:fXYAAOSwPe1UIUxy
, only different size.
As for the other one it could be NDx4. I don't have any glass ND filters to compare.
Who made filter from linked auction? I don't know this logo and my filters are just the same (the same logo).

 

[sevo]

I've only ever seen that logo on filters that came with Soviet cameras, so it will be a USSR (or if they delegated filter production, at least Comecon) maker.

 

[David Hughes]

Hi,

The logo on the Polish ebay filter is from part of KMZ - I think - LZOS or Лыткаринский завод Оптического Стекла or the Optical Glass Factory at Lytkarino or Lutkarino or Lytkarinsky. The town name ends in ский which suggests sky or ski (like the end of Zorki on cameras) to me but this seems to be a minority opinion.

You see the logo on lenses as well. I've a Jupiter 12 marked in English with a Kiev/Contax mount, for example.

Regards, David

 

[sevo]

And if it is a USSR filter, the inscription will be Cyrillic, making "H-4*" a "N-4*", that is, a factor four ND filter...

 

[M_alice]

Exactly. It's not "H" but russian "N". And ND filter.