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Question ... Sony FE 100mm f/2.8 GM OSS STF
#15
Quote:@Wim - Regarding the "graduated aperture" - is that even possible ?

Diffraction does only occur at the edge of materials that have a different refraction index, doesn't it ?

I have a hard time to believe that the APD element has a variable refraction index.

 

THAT BEING SAID - when looking at the bokeh highlights - the effect is only extreme (and I mean really extreme) at f/2.8. It is already massively reduced 1/3 stops down. That could indicate that the APD element does indeed consist of two different segments - with the outer ring having a very different refraction index. 
Wim does not know these things.

 

Anyway, here is a discussion about it:

https://www.dpreview.com/forums/post/59063567
  


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Question ... Sony FE 100mm f/2.8 GM OSS STF - by Brightcolours - 08-05-2017, 10:06 AM

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