11-12-2010, 07:53 AM
[quote name='genotypewriter' timestamp='1289528233' post='4114']
This happens when the CA is very strong. It confuses us when manual focusing because sometimes focus can be seen coming in and going out at multiple distances (but at very close distances and at high magnifications only... like in your magnified LV). I've had the most trouble with this problem in the Nikon 24 1.4G corners and the Canon 50 1.2L corners.[/quote]
The CA isn't there in the focus zone, it is only really visible once you get a little out of the focus region. The focus ring of the 50 f/1.8 II really doesn't help <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />
I was just making an observation, and this is just a speculation on my part on the possible cause of it. If I hadn't put it side by side with another lens I wouldn't have suspected it. I guess without samples, it might sound worse than what I saw, which was such a minor difference it's not far off the limit when I wonder if it is there at all. I'm not intending to spend any time analysing it. I think I've done far too much pixel peeping over the last day or so <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' /> Now I'm getting on with using the lens, which of course is the reason I got it in the first place...
This happens when the CA is very strong. It confuses us when manual focusing because sometimes focus can be seen coming in and going out at multiple distances (but at very close distances and at high magnifications only... like in your magnified LV). I've had the most trouble with this problem in the Nikon 24 1.4G corners and the Canon 50 1.2L corners.[/quote]
The CA isn't there in the focus zone, it is only really visible once you get a little out of the focus region. The focus ring of the 50 f/1.8 II really doesn't help <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/tongue.gif' class='bbc_emoticon' alt='
' />Quote:Fractionally different at same f-numbers? Well there are other lens-specific things that can cause a difference in exposure... e.g. vignetting, light transmission, flare, etc. But I'm not sure why this should be such a big deal because we meter for each lens using TTL metering.
GTW
I was just making an observation, and this is just a speculation on my part on the possible cause of it. If I hadn't put it side by side with another lens I wouldn't have suspected it. I guess without samples, it might sound worse than what I saw, which was such a minor difference it's not far off the limit when I wonder if it is there at all. I'm not intending to spend any time analysing it. I think I've done far too much pixel peeping over the last day or so <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' /> Now I'm getting on with using the lens, which of course is the reason I got it in the first place...
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.