In praise of AA filters

Started Oct 23, 2013 | Discussions thread
rovingtim
Veteran MemberPosts: 8,136
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Re: Pro AA filter users forget Sigma's Foveon sensor
In reply to Tom Axford, Oct 25, 2013

Tom Axford wrote:

rovingtim wrote:

Example:

In the middle of this crop, look at how the detail dissolves in patterns that do not exist in the fabric. In other words, the sensor is trying to resolve detail with partial information. The software constructing the missing 'detail' is getting it wrong.

Thanks, I see what you mean. I was thrown by the use of the word 'moire' which I think perhaps should be reserved for the larger-scale patterns produced by aliasing.

These effects seem to be fairly well muted, however. I think Sigma must have taken steps to alleviate the problems or they could be far worse.

All AA-less cameras must take steps because the camera is trying to present detail that the sensor cannot capture. Whether it 'looks' right or not does not change the fact that this 'detail' is software invented and not optically captured.

The result is colour shifts, detail oddities, and jaggies as I demonstrated in Basalite's image.

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