APS-C IMAGE QUALITY VS fULL fRAME AT TESTING

Started Feb 24, 2013 | Discussions thread
qianp2k Forum Pro • Posts: 10,350
Re: A bit more help.

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. 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. FF has better IQ in multiple areas, not just high ISOs and sharpness but in other areas as described above. In general photos from FF has better look, more popup and more dynamic. 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. They have the same AOV but not exact the same in FOV as shown in photos if you really differentiate between two.

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