Moire in Canon A590

On Thu, 05 Nov 2009 23:51:45 +1000, Bob Larter <>
wrote:

>Alfred Molon wrote:
>> In article <wBpIm.349$>, Peabody says...
>>> Today I tried to take a picture of the strings of a grand piano,
>>> from the back end, and got a significant moire pattern in the area
>>> where the bass strings lie above the treble strings, but are strung
>>> in different directions. This criss-cross area looked pretty bad.
>>>
>>> Is there anything I can do to reduce or eliminate this effect? Any
>>> camera setting that I could select?
>>>
>>> Would a better camera do better in this situation, or is it just
>>> physics? Does the A590 not have any low-pass filter to reduce this
>>> aliasing problem?
>>
>> Canon uses too weak antialiasing filters in their cameras, to maximise
>> the perceived resolution in the images. Other manufacturers use stronger
>> AA filters to avoid this problem.
>
>You have that backwards. Canons have *strong* antialiasing filters, &
>tend to benefit from a bit of sharpening when processing from RAW.


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