Sensor back-reflection usually shows up as a 'hot spot' centered in
the image field, as what you are seeing when it happens is a
reflection of the unfocused rear of the lens.
It can't cause the exaggeration of lens chromatic aberration that
some lenses display on a digital sensor; that happens due to the
geometry of light path and photosite wells/micro-lenses.
Godfrey
On Sep 6, 2005, at 10:22 AM, David Oswald wrote:
Godfrey alluded in another post to the fact that there is a
possibility of sensor reflection affecting an image. This hadn't
previously occurred to me, but makes perfect sense.
So that begs the question; is it possible that some of what we
often think we see as CA is actually a reflection off of the CCD
back to the rear element, and from the rear element back to the CCD?
The CCD is a pretty reflective surface. I suppose that's a
necessary evil. This is asking a question of speculation... Is
there any point for camera manufacturers to investigate the
possibility of non-reflective CCD's? Or is that simply an
impossibility?
