Sonnar aberrations?

[weoul]

Has somebody encounted with such effect at aperture wide open ( 2.8)?
http://www.rangefinderforum.com/photopost/data/4936/medium/Sonnar_abberation_crop.jpg
this is crop of that image:
http://www.rangefinderforum.com/rffgallery/gallery/1522/U1522I1146412626.SEQ.0.jpg

[RObert Budding]

Maybe you forgot to remove the lens cap.

[Socke]

Weoul, I'm still waiting for your crop as I can't find out what you mean with aberrations.

[weoul]

Weoul, I'm still waiting for your crop as I can't find out what you mean with aberrations.
I mean those ultraviolet oreols around white regions :bang:

[netzspannung]

I mean those ultraviolet oreols around white regions :bang:


Fugget about it.. seriously.

The Sonnar abberations are spheric abberation and coma, most apparent when shot wide open and in faster Sonnars (50 \ 1.5 Sonnar, Zeiss-Opton, Jupiter 3), near the edges of the frame, of course. When you see them, you see them, and they are actually very pleasing indeed. Too lazy to find an example, but there are plenty in the RFF galleries

[Socke]

I see some purple cast on your picture and what they call purple fringing in digital tests at the benches.

I haven't seen this in my pictures up to now. Could it be the scanner?

[weoul]

I donn't think that this is scanner.
Look at this crop from the same roll of film (Planar 45/2 f16) - scene is of much more of contrast:
http://www.rangefinderforum.com/photopost/data/500/medium/Planar_crop.jpg

Full image:

http://www.rangefinderforum.com/rffgallery/gallery/1522/U1522I1146420403.SEQ.0.jpg

[Nikon Bob]

I would have guessed that it is from scanning too. I would bet that it does not show up in a print?

Nikon Bob

[weoul]

Forgot to say - scanner Nikon Coolscan 50-ED

[Socke]

I scan with a Canon FS2710, it might just not see the problem at 2720dpi.

I have this as 11x17 hanging on a wall and there I can't find purple fringing but if my memory serves me, it was stopped down to f4 and I had a B&W skylight on the lens.

http://www.hett.org/files/0001/crop00210600.jpg

[weoul]

Thanks Socke for answerring, but I think that the key word in you message is f4
This reminds me the test of Jupiter-3 at f2 (sonnar scheme) - all the same,to much more extent though

[Socke]

I don't think the Contax G Sonnar 90 has much in common with a Jupiter-3. Starting at the focal lenght over glas to coating.

The purple fringing you have in your picture looks too close to that in digital cameras where it's usualy caused by reflections between the back element and the sensor or parts of the sensor like lowpass filter and infrared filter and it doesn't change with the aperture.