Archived posting to the Leica Users Group, 2007/02/22

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Subject: [Leica] Mystery: Sensor Dust & Small f/stops
From: robert.rose at mac.com (Robert Rose)
Date: Thu Feb 22 10:11:18 2007
 
I have noticed that at small f/stops (say, f/16), I can see very tiny black
spots on my M8 images.

These spots become more like faint circles at mid f/stops (f/8), and are
completely unnoticeable at wide apertures (f/2).

[I should add, this is lens independent.]

So, is this dust on the sensor?

If so, what physics accounts for the dust being "in focus" and "out of
focus" as a function of f/stop?  If it is dust, then shouldn't it be
blocking a region of pixels, independent of f/stop?.

Thanks,
Bob Rose
Replies: Reply from michiel.fokkema at wanadoo.nl (Michiel Fokkema) ([Leica] Mystery: Sensor Dust & Small f/stops)