12-02-2010, 08:28 AM
[quote name='Klaus' timestamp='1291276283' post='4675']
In simple words: an AA filter softens an image in order to avoid moire/aliasing effects. The softening can be (pretty much) reversed via a certain amount USM due to the linear nature of optical systems. Thus a very defined amount of USM is recovering (most of) the original amount of "resolution" information (at cost of sensor noise though).[/quote]
I'm not sure if I would refer to it using the terms "reversing" or "recovering". It's like you get milk (optical image), out of which you get cheese (AA-filtered image) and you turn it in to something else by putting it on a pizza (sharpening in post) <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />
GTW
In simple words: an AA filter softens an image in order to avoid moire/aliasing effects. The softening can be (pretty much) reversed via a certain amount USM due to the linear nature of optical systems. Thus a very defined amount of USM is recovering (most of) the original amount of "resolution" information (at cost of sensor noise though).[/quote]
I'm not sure if I would refer to it using the terms "reversing" or "recovering". It's like you get milk (optical image), out of which you get cheese (AA-filtered image) and you turn it in to something else by putting it on a pizza (sharpening in post) <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' />GTW