Zeiss Anastigmat Patent Ross London 119mm, f/12.5, №173

**electronick** · 25-Jun-2023, 09:02

Hello, friends.

Maybe somebody would be so kind and tell about that lens more information - first of all its production year.
Thank you in advance!

**Vaidotas** · 25-Jun-2023, 09:37

Beware - infected links on thumbnails.

**Steven Tribe** · 27-Jun-2023, 02:51

Mid to late 1890’s. Zeiss patent lenses made by Ross had own their serial number progression.
This is a series IV wide angle design (Protar) covering just 12x15cm. Front lens has a diameter of 12mm. 80 to 100 degrees.

**electronick** · 2-Jul-2023, 02:55

Originally Posted by Steven Tribe

Mid to late 1890’s. Zeiss patent lenses made by Ross had own their serial number progression.
This is a series IV wide angle design (Protar) covering just 12x15cm. Front lens has a diameter of 12mm. 80 to 100 degrees.

Many thanks about the answer!

**arri** · 3-Jul-2023, 07:36

I guess this lens covers much more than 12x15cm.
I have a f/9 75mm Protar and Zeiss listed it with 90° angle of view and it really covers 4x5 inch.
The f/12.5 protar lenses have a larger angle of view. I mean 110° when I remember right.
So it should cover 8x10 inch.
Don't await an extreme sharpness but it is usable.

**Steven Tribe** · 4-Jul-2023, 10:48

No it is the Series V (F1:18) which is the 110degree WA. The 112mm focal length covers 5x7”. The series IIIa (F1:9) has a 97 deg coverage so the no.3 ( focal length 172mm) is OK for 5x7”.