I think Cosina did excellent work with the Zeiss formulae. I have the 2.8/35mm
Biogon ZM, too, and it's one of my favorite and most used lenses for 35mm and
digital.
Dave
________________________________
From: rollei_list-bounce@xxxxxxxxxxxxx <rollei_list-bounce@xxxxxxxxxxxxx> on
behalf of Thor Legvold <dmarc-noreply@xxxxxxxxxxxxx>
Sent: 22 October 2018 11:09
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: OT: Contax IIIa RD & Biogon 2.8/35mm ...
I have the 35mm Biogon f2.8 myself and can attest to it’s performance.
Thor
On 21 Oct 2018, at 23:09, Jan Decher
<wanderjan@xxxxxxxxx<mailto:wanderjan@xxxxxxxxx>> wrote:
Here is my Contax IIIa postwar coated Biogon 2.8/35mm tree picture on a
somewhat hazy day:
https://www.flickr.com/photos/mittelformat/31605133268/
This picture prompted me to sell this lens eventually. Admittedly, I also own
the modern Cosina/Zeiss ZM 2.8/35mm Biogon, so did not really need to keep both.
Should really reshoot this picture with the ZM 35mm lens and the AF Zeiss/Sony
35mm Sonnar which I bought this year for the Sony 7II to get the full
comparison of all three.
Jan
On Oct 21, 2018, at 9:22 PM, CarlosMFreaza
<cmfreaza@xxxxxxxxx<mailto:cmfreaza@xxxxxxxxx>> wrote:
Richard:
The following image was taken with a Canon EOS 5D Mark II, a
very sophisticated digital camera and a Canon EF USM 24-70 multicoated lens.
Sometimes the flare has a an artistic purpose:
https://flic.kr/p/NfJCqY
Carlos
El dom., 21 oct. 2018 a las 15:54, `Richard Knoppow
(<dickburk@xxxxxxxxxxxxx<mailto:dickburk@xxxxxxxxxxxxx>>) escribió:
That is a lot of flare. The Sonnar has only six glass-air
interfaces, same as a Tessar. I wonder if the flare is from
something else such as haze in the lens or the cement beginning
to separate. Shine a strong flashlight through the lens to see if
there is any haze. Biotar type lenses have eight glass-air
surfaces and do tend to be flary. Flare from element surface
reflections increases geometrically with the number of reflecting
surfaces.
