Re: Nikon D800 announced -- 36mp, w/ & w/o AA filter
sebboh wrote: Thorsten wrote: zhangyue wrote:
you are use lens wide open, hand hold shot, you don\'t need worry about it since either your lens resolution or your blur hand will be a low pass filter for 36M sensor.
Over on Nikongear, Bjorn Rorslett wrote that aliasing will hit worst when shooting very fast lenses (f/1.4 and faster) wide open, though I have no idea about the theory behind it. He posted some examples, too.
that sounds crazy to me. things have to be in focus to cause aliasing. most (certainly not all though) lenses that fast cannot resolve enough detail wide open to provoke moire (the lens itself acts as an AA filter). more importantly though, when you shoot at those apertures the dof of field is so slim you won\'t even notice the moire. a one cm thick plane of focus falling on part of a dress is not going to create any image ruining aliasing artifacts. the only way this would become an issue is if somebody is shooting something flat and in the focus plane wide open with one of the best f/1.4 lenses made. so really only people who shoot flat art pieces made of textiles at f/1.4 will have such issues.
f/2.8 to f/5.6 and shooting people with a flash is where the real difficulty will be. i have to say i\'m surprised by the f/9 moire examples as diffraction should already be limiting resolution at f/9 if i remember correctly? i guess just not enough.
The sample Bjorn posted is with the D3x and f/1. Crazy or not, it\'s reality. I downloaded it and checked the EXIF.
Feb 17, 2012 at 01:58 AM
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