clickhappy From United States of America, joined Sep 2001, 9444 posts, RR: 72 Reply 5, posted (11 months 2 days 16 hours ago) and read 5336 times:
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The Cargolux shot is pretty blurry, but most likely due to it being 400mil at 1/400. But is that really ISO100? That grain is quite noticeable. That shot was also at f/7.1, have you tried stopping it down to f/8 or f/11?
The (I think?) Hawker is also long (370mm) and relatively slow (1/500). Again at f/7.1
jpmagero From United States of America, joined Apr 2012, 149 posts, RR: 0 Reply 9, posted (11 months 2 days 9 hours ago) and read 5269 times:
I shoot with the same combination (7D + 100-400) and haven't had the focus issues you mention, but I do see that all my shots are very grainy, even at ISO100. Except in extremely bright light on a very bright surface, I *always* have grain in my images. It's not so much of an issue for printing through 13x19, but is noticeable on screen and for sites like this can cause issues (not that this is my only problem getting HQ photos on here). I've always attributed this to the 7D sensor, not the lens. Other IQ issues are my technique, I'm sure.
This sample 100% crop is not a HQ shot, but I don't have many samples on my work PC. Either way, you can see the extreme (IMO) grain present in the shadow and sky.
The noise/grain at ISO 100-200 is a characteristic of the 7D. It's usually not a big issue and is easily managed with slight noise reduction in ACR or LR, but I will say I'm getting tired of the 7D image quality. Fantastic camera, but it suffers in the IQ department.
Back to the OP, I'm wondering if you have hada flawed lens this whole time but couldn't see the problem at the relatively small resolution of your 30D. At 18mp, the 7D shows any weakness in a lens.
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JakTrax From United Kingdom, joined Jun 2005, 4732 posts, RR: 8 Reply 11, posted (11 months 2 days 6 hours ago) and read 5224 times:
Quoting Silver1SWA (Reply 10): Back to the OP, I'm wondering if you have hada flawed lens this whole time but couldn't see the problem at the relatively small resolution of your 30D. At 18mp, the 7D shows any weakness in a lens.
Exactly what I was about to say. I had a 28-105mm lens on my old 30D and it was fantastic, but once I put it on the 50D the softness at the frame edges was noticeable. My first 100-400 was terrible one side (I forget which - seem to recall the left), so I swapped it for another and that one was (and still is) fine. Had I coupled it with my 30D the issue may have been less obvious.
I have to be honest and say that, in addition, it appears that you are using the 100-400 in conditions that any lens would falter in. This time of year I keep mine in its box as atmospheric conditions are just too unreliable to guarantee great pictures. Both your example images seem to be at very long focal lengths, with mediocre/poor light, and insufficient shutters. The thing with this theory, of course, is that such limitations would have presented themselves way before now, with the old 30D.
I personally reckon it's a case of the first theory - the resolving power of the 7D revealing softness in the lens.