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1.6 crop IQ tests don't look as sharp compared to full frame, why?

Started Feb 1, 2017 | Questions thread
ffabrici Senior Member • Posts: 1,353
Re: 1.6 crop IQ tests don't look as sharp compared to full frame, why?

In the first comparison, you are comparing the resolution of a 7DII with the internal extender engaged which equals 400x1.4x1.6 = 896mm (1.6x560mm) with the resolution at full frame 400mm. The softness you spot with the 7DII test picture shows the limitation of the lens resolution and should be compared to the full frame picture enlarged 2.24 times.

Even dedicated extenders are deteriorating lens resolution and lens contrast so they are no magic solution, but a very cost-effective alternative to buying a lens with a longer focal length.

Conclusion: The 7DII is not softer; I use it extensively on my 100-400L II, 300L II and 800L with and without Extender 1.4X III, but never with a 2X Extender where the quality takes too much of a hit for my taste.

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