But we definitely are not interested in continuing to hear scrambled theories about why a small sensor works well for you. If you are not able to separate those two very different aspects, then I agree that photomacrography.net is not a good fit for you. --Rik If the math looks just scrambled theor...

@Justwalking, That requires arguing that small sensors have some intrinsic advantage over large sensors regarding the DOF/diffraction tradeoff, and sorry, they just don't. Washington state quarter[/url] and your ball point pen are beautifully illuminated and are very sharp. So, if you really want t...

My normankoren computation was for same MP on both sensors. The displayed images were for 7 MP small sensor versus 7 MP resized from FF. Sadly, I don't have a small sensor and FF sensor with same native MP, so resizing is the only way to do a same MP comparison. --Rik Than your computation is not c...

Theory and experiment agree completely. At same FOV, same MP, and same rule for optimal aperture, the small sensor image and the large sensor image look the same . Exactly as shown in my image pair at m=0.68 and f/8.5 on crop 5.5, versus m=3.74 and f/47 on FF. And as predicted by diffraction math, ...

Justwalking, I'm not sure I understand how you're thinking about this. Up to now, I have been trying to get you to realize that at same DOF and same FOV, the number of Airy disk diameters across the frame will be the same for all format sizes. Now, it sounds like you agree that the number of Airy d...

My equipment was still mostly set up, so I thought it would be worth the effort to show people what f/94 on fullframe actually looks like. I hope this is helpful. --Rik Also people can take close view of the F/100 vs F/16 on APS-C at Magnification m=3 here http://extreme-macro.co.uk/microscope-obje...

Accounting for the difference in criterion, that underlined 4 in the table at 35mm f/22 would become 4*2.44*2.44 = 24 MP, and then extrapolating from f/22 to f/92.4 would give 1.35 MP. A corresponding column for 1/2.5" would give the same MP for f/16.8. --Rik Unfortunatelly we can't just change the...

Let's say i take a lens El-Nikkor 50mm/2.8, set magnification X2 and put f(nom) = 5.6 with crop factor sensor 5.5. Then Feff will be 5.6(2+1) = 16.8 - still pretty acceptable to see the result and determine the DoF. To get same DoF on FF f(eff) must be = 16.8x5.5 = 92.4(!) for the same FoV. Then th...

:lol: Do you realise that 16mpx FF pixel is way bigger than 16mpx 1/X" sensor? Yes, small sesor can give in macro same Dof with less diffraction. or more Dof with same diffractioin, or both at same time Only if you use low resolution sensor that is severly limiting overall resolution, yes. Someting...

We can easily get more DOF on either size sensor, by stopping down more. To go along with the more DOF, the increased blurring due to diffraction will also be the same on both sizes of sensor. Your belief that it won't is apparently based entirely on imagination and scrambled math. There is no corr...

What I've done here is to image an 8.5 x 6.4 mm FOV, at NA 0.04, on two sensors that are different in size by a factor of 5.57. To be precise, one sensor is nominal 1/2.5", 5.744 x 4.308 mm, native 4:3 aspect ratio, and the other sensor is fullframe cropped to 4:3 aspect ratio, so 32 x 24 mm. With ...

Need to say that in astronomy there is specific reason for take 3 pixels. There works usually with bright beams on dark field and there need to avoid any artefacts to count flux from the stars of very different brigthness very accurate. Although these aliased artifacts are at a low level, they would...

About correct sampling of Diffraction Limited Images

http://wiki.astro.cornell.edu/twiki/pub ... 111212.pdf

Thanks again for the information. I will experiment this myself using same lens at same aperture with both APSC and 4/3 cameras then let you know. I will try to fix the working distance too. May be with a 5X Mitty or a Apo Rodagon 50. For a given magnification, DOF is independent of focal length. I...

So lonepal is correct when wrote: I think I will get more dof with a m4/3 sensor than the apsc right? And answer must be YES. Sorry, but the answer is that it depends entirely on how you set the optics. Here are two images that I shot recently. One of them was shot on a 1/2.5" sensor, 5.744 x 4.308...