FB101
Well-known member
yes, same cancellation method used by canon in the 5DS / 5DS R a little later.
Are you ok with AA filter bodies for shooting wildlife?
- Thread starter sid_19911991
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yes, same cancellation method used by canon in the 5DS / 5DS R a little later.
Doug Herr
Well-known member
I didn't see the point of the AA filter on the Sony a7II because I'd still get color moire and aliasing in feather detail.
The benefit of the OLPF is to reduce moire and false colour. On higher resolution cameras the risk of moire is reduced.
I can't always/usually tell the difference between moire and CA.
Moire is usually a patterned rainbow effect on highly consistent lines or grids just at the edge of in focus areas. There is usually a nearby sharp area, and with higher resolution cameras, the detail is excellent. But if you have a very detailed grid or line pattern that extends to barely out of focus areas, in some cases that area shows moire. It's most common in manmade patterns because of the consistency - a metal or shingled roof, fabrics, or window screens. It can show up in feathers, but is uncommon. It's very rare in fur or hair.
If you have a high resolution image, you can create moire through resizing or downsizing and image that did not have moire originally. In this case the in focus area is reduced in size having the effect of creating a barely out of focus pattern. These patterns are usually resolved by changing the resizing algorithm. In Lightoom, the algorithm for downsizing is a bit of a blackl box and can't be changed (to my knowledge). In Photoshop it's easy. Normally Bicubic Sharper is used in Photoshop, but you usually can eliminate moire by choosing another option such as Bicubic, Bicubic Smoother, or even adjusting Preserve Details to soften the image.
Sometimes the graphic card and video driver create moire on a monitor by resizing an image to fit your screen view. In this case you can ignore the moire because it's unlikely to show up elsewhere, but you can verify that by zooming in for a closer look at the file. There usually is no moire zoomed in and magnified because the algorithm for resizing has changed.
If you have a high resolution image, you can create moire through resizing or downsizing and image that did not have moire originally. In this case the in focus area is reduced in size having the effect of creating a barely out of focus pattern. These patterns are usually resolved by changing the resizing algorithm. In Lightoom, the algorithm for downsizing is a bit of a blackl box and can't be changed (to my knowledge). In Photoshop it's easy. Normally Bicubic Sharper is used in Photoshop, but you usually can eliminate moire by choosing another option such as Bicubic, Bicubic Smoother, or even adjusting Preserve Details to soften the image.
Sometimes the graphic card and video driver create moire on a monitor by resizing an image to fit your screen view. In this case you can ignore the moire because it's unlikely to show up elsewhere, but you can verify that by zooming in for a closer look at the file. There usually is no moire zoomed in and magnified because the algorithm for resizing has changed.
sid_19911991
Well-known member
Wow, that's some good intricate info.
I was wondering if the intensity or severity of the AA filter varies from one AA filter camera to another AA filter body. Or is it all standardized?
As I understand it the filter has to be made specifically for a given sensor. Based on the pixel pitch of the sensor the filter is designed to remove/alter the wavelength of light that will cause problems.
Yes, there are a range of AA filters out there and there's no single standard design. Also as Dan posted above the amount of low pass filtering varies by wavelength so it's not unusual to have better Moire suppression on the green channel relative to the green or blue.
Good info.