ROSS Symmetrical F16 ANGLE?

[seanwang]

Does anyone know ROSS Symmetrical(protable) f16 angle? 75? 90? or 100?
Thanks.

[Steven Tribe]

There two F16's from Ross ( apart from the licensed Zeiss and Goertz lenses).

The "portable" is a a standard RR - scaled down in size to be ....... portable!

The other is a wide RR - but not that wide, I think.

Deciding which is which is a real problem as the size numbers and the focal lengths are very similar, if not identical!

[lucaas]

Hi Sean,

Below is a catalog page of Ross portable symmetrical lens. It is a pretty old one because it only existed in Ross catalog till 189x.
The 8" focus length one can cover 8x10 so it should be a 80-degree lens.

[seanwang]

There two F16's from Ross ( apart from the licensed Zeiss and Goertz lenses).

The "portable" is a a standard RR - scaled down in size to be ....... portable!

The other is a wide RR - but not that wide, I think.

Deciding which is which is a real problem as the size numbers and the focal lengths are very similar, if not identical!


Thank you , the portable is portable, hahaha:cool:

[seanwang]

Hi Sean,

Below is a catalog page of Ross portable symmetrical lens. It is a pretty old one because it only existed in Ross catalog till 189x.
The 8" focus length one can cover 8x10 so it should be a 80-degree lens.

lucaas, thank you, this catalog is very useful.
I have no.3 and no.7, as my imprecise measurement, the "light circle" is about 95-100 degree, so in actual use might 80-90 degree.