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

Started Apr 10, 2013 | Discussions thread
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Re: resolution
In reply to Just another Canon shooter, Apr 14, 2013

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 accurately...you 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.

"Equivalent lenses" is a bit of an oxymoron when you think about it. I can't think of a single pair of 'equivalent' lenses that would be suitable for determining the resolving power of a sensor. Any duo you pick will likely have one a little stronger or weaker than the other.

So, to remove this variance, simply shoot using the exact same lens at the exact same subject distance. That way, exactly the same level of detail is available at the sensor plane for the sensor to record. Then look closely to see which sensor recorded more of it. It's easy to do and the only variable is the sensor - making it a very good test, as it's the sensor that you are testing.

It's easy to see that the DxO tests (and most other MTF tests) are primarily concerned with edge sharpness - not resolution. One look at the test target will tell you that. And, though they are related for sure, they are not the same thing.

BTW, even if you don't, the results will be comparable. Read the Imatest explanations. But this is off topic anyway.

True that.

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