theSuede wrote:
If you look at a picture - the finished picture - you think that \"sharp\" is when something has good contrast at pixel level (at the scale you\'re looking at the picture with).
Hmm, I think I understand, but it seems somewhat counter intuitive to me. So you don\'t look at what is projected on the sensor but on the final image. Since the crop sensor is smaller it will have to resolve more (lp/mm) to get the same amount of detail as the larger sensor. Hence per definition the circle of confusion will per definition have to be smaller. Am I right so far?
I think that what I did not think of is that the final image size matters. But it still seems incomplete. What about the lens for instance? Usually as spatial frequency increases MTF drops. If for instance a lens can do (I\'m just making up numbers) MTF50 at 40 lp/mm and MTF10 at 80 lp/mm - won\'t that affect the sharpness. AFIK DOF is defined as the distance between two that appear \"acceptably sharp\" in an image. What about other factors such as an AA filter?
An AA filter will blur the entire frame and therefor details that would have been just enough sharp to be considered within DOF without an AA filter now become blurry enough not to be considered to be within DOF. Would one say that an AA filter leads to a more narrow DOF? That sounds awfully strange to me...
Aug 05, 2011 at 06:29 PM
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