ОФ-233 / OF-233 210mm f/2.5

[monkeymon]

Hello

Does anyone here own this Russian version of aero ektar?

If so, can you confirm is the glass yellow tinted?

Regards. Aleksi Koski

[Dan Fromm]

http://www.photohistory.ru/1214755009023752.html

Filter, perhaps?

[monkeymon]

http://www.photohistory.ru/1214755009023752.html

Filter, perhaps?

I was asking from people who actually own this lens.

The photos on photohistory.ru are not shot so that you would see the yellow hue.

I have had 3 of these, all have the same yellow hue in the glass.

[Dan Fromm]

Hmm. Would you be eBay seller aero-ektar-alternatives? Would this http://www.ebay.com/itm/OF-233-210mm...-/321468609393 be your listing? Would you have received this

lens internal elements severely yellowed seller is denying refund at this moment

negative feedback on July 24?

[EdSawyer]

If it is yellowing due to radioavtive glass, that can usually be cleared with UV light.

[monkeymon]

If it is yellowing due to radioavtive glass, that can usually be cleared with UV light.

It's not a radioactive lens.

But anyhow, thanks for the input. But i'm kinda looking for people who own one on these.

[Jason Greenberg Motamedi]

I had one a few years back and its glass was yellow, but it was a light yellow, not the brown-yellow I have seen with thorium glass.

[monkeymon]

I had one a few years back and its glass was yellow, but it was a light yellow, not the brown-yellow I have seen with thorium glass.

Yes, this is what i have noted also. It's not thorium but it has a yellow hue.. constant from lens to lens. And it seems to be on all elements, so probably the glass type used to compensate thorium.

[Jody_S]

Yes, this is what i have noted also. It's not thorium but it has a yellow hue.. constant from lens to lens. And it seems to be on all elements, so probably the glass type used to compensate thorium.

From a physics point of view, it's a lot easier to build a high-resolution lens for one specific wavelength than for the entire spectrum, and yellow seems to be the best wavelength for aerial recon. So, instead of making these with a detachable yellow filter like most US aerial lenses, they colored the glass? If so, the lens is OK for B&W portraiture and landscape, but useless for color.

[monkeymon]

From a physics point of view, it's a lot easier to build a high-resolution lens for one specific wavelength than for the entire spectrum, and yellow seems to be the best wavelength for aerial recon. So, instead of making these with a detachable yellow filter like most US aerial lenses, they colored the glass? If so, the lens is OK for B&W portraiture and landscape, but useless for color.

It's not actually a yellow filter, more like warm tint (something like a 81a filter). It comes with a detachable filter. Works just fine for color, same as Aero Ektar whit tinted glass.

The lenses whit inbuilt yellow filter look completely different.

Liket this:
http://www.ebay.co.uk/itm/Air-Minist...-/191262250401