APS-C IMAGE QUALITY VS fULL fRAME AT TESTING

Started Feb 24, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 40,751
Re: A bit more help.

qianp2k wrote:

Great Bustard wrote:

But anyway your analysis doesn't prove lenses designed for smaller sensors are better than ones designed for bigger sensors. You cannot test lenses alone anyway.

The claim was never that "lenses designed for smaller sensors are better than ones designed for bigger sensors". The claim was that in the cases when they are, it narrows the IQ gap between crop and FF.

I can say other way around. For crop to compensate resolution loss from crop magnification (or perceptual sharpness or fine details) deficit, it's a uphill battle that you'd need a much better lens (more than often such lens doesn't exist) and lots more pixels.

That's not the "other way around", but rather exactly what I said.

Resolution is just one factor of IQ spectrum, there are others that FF prevails such as color tonality, DR (from the same manufacturer in the same generation) especially in highlight headroom, SNR, DOF control and of course high ISOs.

No one has said, or implied, otherwise.

FF has better IQ in multiple areas, not just high ISOs and sharpness but in other areas as described above.

FF can also fall behind, such as when the smaller sensor is more efficient and a particular DOF and shutter speed are needed.

In general photos from FF has better look, more popup and more dynamic.

All of these are subjective assessments, and the same language used by fanboys of every system.

For example the same equivalent FF 50mm has different perspective look from 1.0x with a 50mm lens and 1.6x with a 31.25mm lens.

No -- perspective is a function of only subject-camera distance.

They have the same AOV but not exact the same in FOV as shown in photos if you really differentiate between two.

OK, show me a photo taken of the same scene from the same position at 50mm on FF and 31.25mm on 1.6x, and convince me, on the basis of framing and perspective, why one is better than the other.

Pure sillyness.

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