Return of Interesting article on DxO about 5D III and D800...

Started Apr 10, 2013 | Discussions thread
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Just another Canon shooter
Senior MemberPosts: 4,691Gear list
Re: You bet
In reply to Mako2011, Apr 14, 2013

Mako2011 wrote:

Just another Canon shooter wrote:

Mako2011 wrote:

Just another Canon shooter wrote:

The distance depends on the FOV, not on the format. Equivalent FL = same FOV = same distance to the same target.

Note that I am talking about equivalent lenses, not about the same lens.

We were discussing resolution. To compare resolution across different sensor formats have to maintain the same distance to target or your resolution results will not be comparable.

When you shoot with equivalent FL's, you do shoot from the same distance.

Yes...for example... 40mm f/4 1/100 ISO 200 on 4/3 is equivalent to 50mm f/5 1/100 ISO 320 on 1.6x which is equivalent to 80mm f/8 1/100 ISO 800 on FF when the photos of the same scene are taken from the same position and displayed at the same size.

Not sure our friends at DxO are so picky

BTW, even if you don't, the results will be comparable.

Not when comparing resolution across different formats.

Yes, always. The slanted edge test which DXO uses is largely independent of the shooting distance. If they used some periodic pattern, then changing the distance would require changing the spatial frequency.

Again, this is of topic, really. The reason FF resolves more at medium to high contrast (with EF lenses, at least) is the crop factor. There is no conspiracy, no distance cheating. The good lenses resolve more on FF than on crop despite the FL; again, at medium to high contrast. At low contrast, more mp win. I am not sure why we need long threads for this.

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Canon EOS 5D Mark II Canon EF 15mm f/2.8 Fisheye Canon EF 35mm f/1.4L USM Canon EF 50mm f/1.2L USM Canon EF 135mm f/2.0L USM +4 more
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