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

Started Mar 8, 2013 | Questions thread
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Mako2011 MOD
Forum ProPosts: 19,229
In reply to ultimitsu, Mar 12, 2013

ultimitsu wrote:

Mako2011 wrote:

ultimitsu wrote:

Mako2011 wrote:

Not when comparing formats....The distance needs to be the same when comparing across formats.

There is no logical basis for such claim.

not true at all


nothing on this essay sayings anything that contradict with the view 6D + 24-105 outresolves 7D + 15-85

in fact it expressly discusses this subject:


4) Larger sensors require sharper lenses

In fact, the exact opposite is true. First of all, as discussed in Myth #1, it is important to compare systems at the same DOF when discussing sharpness, since if we don't, the system with the more shallow DOF will have less of the scene within the DOF, and thus appear less sharp. So, given that we are comparing systems at the same DOF, consider the following scenario: we have two targets, each with the same number of squares on them covering the entire area. Since both targets have the same number of squares, the squares on the larger target will be larger than the squares on the smaller target. Thus, when trying to hit the squares on the smaller target, we need to be more accurate than when aiming at the squares on the larger target. For example, if the larger target has twice the length and width of the smaller target, then we need to be twice as accurate to hit the smaller squares on the smaller target. This is why the MTFs for 4/3 lenses use 20/60 as compared to 10/30 for FF. In the same way, a lens on a larger sensor does not need to be as sharp as a lens on smaller sensor to resolve the same amount of detail. Lenses that are able to resolve the same detail on sensors with the same number of pixels on their respective formats have the same relative sharpness."

Correct...and The photos all have the same DOF (as well as diffraction softening) when they have same perspective (subject-camera distance), AOV, aperture diameter, and display size. You are getting closer, that's a good thing and why a great discussion.

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My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)

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