APS-C IMAGE QUALITY VS fULL fRAME AT TESTING

Started Feb 24, 2013 | Discussions thread
MOD schmegg Veteran Member • Posts: 5,768
Re: APS-C IMAGE QUALITY VS fULL fRAME AT TESTING

Donald Duck wrote:

schmegg wrote:

TDP has lens tests.

Wrong, those are camera-lenses tests. For lens only tests, you would need different equipment.

Nope - they are lens tests. Just because they are conducted on some different cameras does not mean they are in any way designed for comparing the resolving capabilities of the different cameras. And, in fact, doing so is flawed as the target distance is variable.

The test are not designed to determine which camera is capable of resolving more detail. I explained it all before. Perhaps you could tell me the distance to the target that TDP used for both of those tests?

Whatever it was, it was the same (within <10%). Equivalence.

Whatever! No - it's relevant.

And, while your at it, why you would think a 50/1.4 at f1.4 would deliver anywhere near the image detail to the sensor plane for recording as an 85/1.8 at f2?

That is the whole point that MAC made and you agreed. It makes sense to compare (1) systems at (2) equivalent settings. You keep insisting on your interpretation of what "a sensor can resolve", something that nobody cares about, not even you.

If you wish to compare which of two cameras is capable of resolving more detail, the only sensible way to do this is to present exactly the same detail to each sensor and then see which one resolved more of it.

Any other methodology is flawed as it will lead to the inevitable conclusion that "it depends on" which lens, what situation etc...

What you describe says nothing about which system is capable of resolving the most detail as you wont be presenting the same detail to the two systems to record. It analogous to trying to determine which of two microphones is more sensitive by recording the same sound from 50ft with one microphone and 5ft with the other!

And to show you just how flawed this is, here's a comparison using the method you suggest -equivalent settings and different lenses and TDP lens tests. It clearly shows the crop easily out-resolving the full frame.

Full frame resolution comparison using flawed methodology.

Crop resolution comparison using flawed methodology.

So, from this we can conclude that crop does indeed out-resolve full frame with equivalent settings using your prescribed method of comparison.

Of course, it's easy to come up with a different comparison that shows a different result. And that is precisely why the method you are describing is completely useless if you wish to talk about comparing resolving abilities of two different systems.

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