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| p.1 #17 · Some new images from my Canon 500D/t1i without AA filter ... |
Ben Horne wrote:
.... There is a perception out there that removing the AA filter will provide a much better image, and that this filter hinders detail. However, that filter is there for a reason. In my experience, any benefit you receive by increased sharpness is negated by "crunchy" looking fine detail, and false color readings. Dealing with these artifacts essentially brings you back to square one.
"I was particularly interested to see if the removal of the AA filter meant better quality images, and whether or not there was any trade off in the other qualities of the camera.
(The AA filter present in most cameras has always been there because without it interference patterns (moire) can appear in fine detail. Slightly blurring the image prevents this, but the consequence is that images then need to be sharpened post-capture. Unsharp Mask in Photoshop is one effective way to do this, although the “sharpening” depends on our contrast perception and is an illusion. However, images look crisp and sharp, so the technique is effective.)
The result is amazing. Examining the images shot on both camera, especially impressive is how a fine tangled mass of branches suddenly becomes clear. How lovely hair texture becomes amazing hair texture. How the surfaces of decaying metalwork come alive with fine detail. This is perfect for detailed, texture-filled subject matter, such as landscapes and architecture, close-ups and macro, and, pleasingly, even portraiture. In the case of portraits we may have to diffuse slightly with some subjects, but we might anyway.
The K-5 IIs which seems to require little or no sharpening and adds a micro-clarity to the texture of subjects. It may be a matter of taste, but I can only say that speaking for myself I am very impressed.
That only leaves the question of moire, and try as I might I could not make it a problem. I have no doubt that as we have been warned of the possibility there may be circumstances, but the instruction book advises that using wider apertures than f/8 will reduce the possibility. Diffraction at smaller apertures can add to the moire effect, although I see no evidence of it so far."
— From the review of the Pentax K-5 IIs, ephotozine.com