Originally posted by jsherman999 Since you're responding, care to elaborate on your claim that at f/11 and smaller there's no resolution benefit on FF to the 36MP with any lens? Or how Roger Cicala obviously doesn't know how to test lenses, because his results prove you wrong? (did he get back to you on that?)
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Let's make this really easy for you.
Supposing that your image has N lines to resolve. Unless you don't believe in the physics of light, diffraction will present only M lines to your sensor. M is always less than N. There is no way in hell you can resolve N when you only see M. No way.
At f5.6 for a 36mp FF, N = M. At apertures smaller than f5.6, you will see that N is reduced to M. At f11, M is only half of N...unless you have photoshop kung-fu like those jokers LOL!!! Sorry, I still can't get over that thing. It was just too funny.
And, no he hasn't replied to me. I still think his methodology was wrong. Let me explain:
f11 is capable of resolving say 50lpmm. Same as any aperture wider than that. So if all you have is 50lpmm then plotting the resolution of f5.6 to f11 will look flat. Very very basic. Don't tell me I still have to explain graphing to you. Anyway, his sample was only half of the max res of a 36mp sensor that's why he is not seeing the full potential of the lens. 1000 lp/ih for a 50mm lens is pathetic. It's either he had a very bad lens or a bad image sample.
---------- Post added 02-28-14 at 04:28 PM ----------
Here's another example: Car headlights. If the car is very very far, you won't see two headlights but only ONE!!! Diffraction is like that. Light spreads such that adjacent light sources appear to merge. Now tell me if your 36mp camera can see two separate headlights better than my iphone in that scenario.
ROFL!!!