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Archive 2013 · OM-D has no AA filter?
  
 
ebrandon
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p.1 #1 · p.1 #1 · OM-D has no AA filter?


According to fairly well-known blogger / OM-D aficionado / gear tester Pekka Potka, the OM-D probably has no low pass / anti-aliasing filter. http://www.pekkapotka.com/journal/2013/5/5/olympus-om-d-no-low-pass-filter.html

If the OM-D really has no AA filter, why would Olympus hide it? Perhaps to avoid a firestorm of pixel-peeping looking for moire and aliasing?

Anyway, it does make sense. The higher the pixel density the less need for an AA filter and the 16mpx sensor in the OM-D has a higher pixel density than even the D800.

What do you think?



May 05, 2013 at 09:12 PM
jotdeh
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p.1 #2 · p.1 #2 · OM-D has no AA filter?


ebrandon wrote:
Anyway, it does make sense. The higher the pixel density the less need for an AA filter and the 16mpx sensor in the OM-D has a higher pixel density than even the D800.

What do you think?


For Moire purposes, pixel density must be considered in terms of "pixels per image height" (or width), not "pixels per mm". Not minding the aspect ratio differences between 4/3 and 3/2 format sensors you can simply take the megapixels directly to estimate how susceptible a sensor is to aliasing.

Edit: And of course it really depends on the scene you are photographing. A fine fabric (at small magnification) would not show any aliasing on a low Mpix picture because it will appear as a uniform surface.



May 05, 2013 at 09:48 PM





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