My Canon glass isn't so hot on the 1Ds Mk. III...

Started Feb 2, 2013 | Discussions thread
rrccad
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Re: My Canon glass isn't so hot on the 1Ds Mk. III...
In reply to CanonKen, Feb 3, 2013

CanonKen wrote:

I have used a 30D for years (well, since it came out, so 6 years I guess). I built up a few lenses since then:

35mm f/2, 85mm f/1.8, 17-40mm f/4L, 70-200mm f/4L (non-IS). They all work great on this camera and I fully trust the camera and lenses under any use (wide open, hard lighting conditions, etc.)

Overall, not at all thrilled with what I see on a FF body.

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The 35mm is pathetic and miserable wide open, but EXCELLENT at f/8-11.

--The 85mm is so-so wide open but EXCELLENT at f/8-11.

--The 17-40mm is decent, probably fine for landscapes and such (corners get soft/distorted). Not good wide open, but for a landscape lens, not a concern.

--The 70-200 is great at 70mm, but not as good at 200mm (some slight softness on one side). Not so hot wide open.

Overall, all 4 lenses can look great, but I have to really stop them down to get something that can make use of the camera.

My question is about expectations. On a high-MP FF body, what should I expect from these lenses? All 4 worked great on my APS-C body, but on FF, the outer areas quickly degrade to a point they look bad on even an modest sized print. Do I have bad copies, or is this normal for lower-tier glass on a flagship FF camera?

very normal.  with most lenses stopping down will improve performance.  wide open, the center may be sharp, but the rest will suffer.  very few lenses are good wide open and are not cheap - especially ones faster than 2.8

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