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IQ of 7d w 15-85mm Vs 6d w 24-105mm?

Started Mar 8, 2013 | Questions thread
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Re: Correct
In reply to usedtobedontrustme, Mar 12, 2013

usedtobedontrustme wrote:

Here is some conjecture on my part. I would think that an a asp-c camera with an asp-c lens gets more magnification from the lens and imprecisions in the less would be more conspicuous under the scrutiny of the magnification. However, I'm confesson that I never took a lesson.

Yes, an APS-C lens needs to be more precise for the same IQ. But reality is that it is often easier to make small lenses to better perfection, for a reasonable price. Look at the tiny lenses from e.g. some Panasonic/Leica lenses on the Panny TZ, they often have very high optical quality. But it is impossible to say such a thing in general, because there are lots of factors involved (e.g. homogeneity of the glass and surface finish, precision of the internal lens threads and mounts, etc.). Most of that is related to the lens design / the type of lens.

FF will have higher image quality if you use a good prime, especially those in the normal to tele range and possibly zooms like the 70-200L, as those are relatively close to perfection (but often you can't make a valid comparison, because there are no L APS-C tele primes/zooms). A 4x standard zoom with midrange price is a different story. Quite often such an FF zoom will be a bit better in the image center, but worse in the corners compared to a similar APS-C zoom. Same applies for SWA range, e.g. 17-40 against 10-22.

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