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Originally Posted by Leif
Don: As a result of your thread, it has struck me that an APS sensor is not as good for macro work as a so-called full size one. I used to often stop down to F22 for DOF, and perusing John Shaw's book Close Ups In Nature, I see he did the same. But, as you have pointed out, at F22 diffraction is significantly impacting the sharpness, and APS will only exacerbate that effect. So while F22 is useable on a full frame sensor (slight image degradation), F22 on an APS sensor is pushing the boundaries a bit too much. I will try to do some tests to see if F22 is useable (my criteria being the quality of an A4 print).
Leif
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Leif,
Agree totally provided the full frame has large pixels ( say total 8mp ). Hence my earlier reference to Harry's image stacking program. Only really usable in very controlled environment.
This was one of the reasons I considered the D2Hs. 4mp but with large pixel well and a diffraction limit of f16. I finally decided that I would go with the higher sensor resolution and opt for slightly less magnification - therefore greater dof. Use the higher sensor resolution to allow the image to be cropped as a better option. For this to be a viable option one is really relying on TOP GLASS.
I have not really had much time to try this theory. I will dig out and post the full frame and crop of my Hoverfly as that was at f9 as an indication of the degree of crop.
I think it will be a worthwhile exercise taking one of your most detailed shots and seeing how much of a crop would still give a good print.
Don