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Forum: Troubleshooting and Beginner Help
05-17-2018, 05:09 AM
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Bill exposure is exposure. There can be subtle differences in lens designs that have the same f stop (but different T stops) and cameras don't always rate their sensor iso precisely (Nikon!) But assuming those factors are the same the full frame lens set to the same exposure will give the same basic exposure on a crop body and a full frame. Also an equivalently fast crop lens will do likewise.
The advantage in low light that you see in full frame isn't based on a different exposure response - it is based on the inherently better performance of the sensor at a higher ISO which allows higher ido to be used with less noise.
Depth of field and equivalence get really contentious. But read the article linked in the previous post for more details.
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Forum: Troubleshooting and Beginner Help
05-07-2018, 09:17 AM
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Perhaps - but I was not limiting myself to those sensor sizes. This really starts to be a bigger deal as the size of the sensor drops. My point is that pixel sizes are related to (but there is overlap) the sensor size and these determine when diffraction starts to diminish the sharpness enhancing that stopping down can supply.
@Normhead - your dog is remarkably well trained!
---------- Post added 05-07-18 at 12:22 PM ----------
I think you are focused on APSC vs. FF here which is fair given the topic of the original post. But my statement isn't limited to those formats. There are small sensor formats where the first f stop is already into diffraction so the peak performance is wide open. My point is made to illustrate that a given lens may have an optical peak at different places on different sensors if diffraction comes earlier on one vs. the other. This isn't as simple as knowing where the lens peaks - but where the lens peaks on a given sensor. But as @normhead pointed out - sometimes the loss of absolute sharpness isn't as important as the other factors. I have shot many macro shots past the point of diffraction trying to eek out a little more DOF for example.
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Forum: Troubleshooting and Beginner Help
05-06-2018, 05:54 AM
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However... The diffraction effects are tied to pixel size which is related to sensor size. So a lens that has peak performance on the k-1 at f11 might peak at f8 on the KP since diffraction onset is earlier the smaller the pixel sites are.
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