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

Started Feb 2, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 40,342
The natural question, of course, is...

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?

Do I see a 24-70 & 70-200 f/2.8 in my future?

...did you compare those lenses with what you'd get on crop for the same AOV and DOF?  For example, one wouldn't compare 35mm f/2 on crop to 35mm f/2 on FF, but to 56mm f/3.2 on FF, since elements of the scene outside the DOF, by definition, will not be sharp.

Of course, there are situations where you might get the whole scene within the DOF even at f/2, and stopping down FF to f/3.2 to get the corners up to snuff will take away the noise advantage it has over crop if there is motion in the scene and we cannot use a lower shutter speed at the more narrow aperture.  Then again, 50mm f/3.2 on FF is going to resolve rather more detail than 35mm f/2 on crop, so, if you like, that additional detail could be traded for less noise with NR (noise reduction).

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