09-09-2010, 09:07 AM
[quote name='admin' timestamp='1283980924' post='2596']
I can see what you mean. However, I'm not 100% convinced that the cause is really the mirror - the effect should be more gradual I think. I just had a look at their sample gallery and I didn't really find something obvious.
Here's a typical candidate according to your logic:
http://masters.galleries.dpreview.com.s3...489311.jpg
Lots of hard contrasts in there yet there's nothing suspicious as far as I can tell.
However, I've seen images with the same kind of "ghostings" in another scope - produced by the Pentax FA* 80-200/2.8. And according to Pentax this was a normal behavior of that lens (caused by internal reflections).
Anyway, my A33 will arrive during the next few days and I will have a look.
[/quote]
I am sure there have been lenses in the past which have produced ghost images of some sort. They never produce an image with an off-set copy of the original image like we see here, though.
And it is not just my logic, others have come to the same conclusion. People have even warned about this possibility when the use of beam splitting mirrors was only still a patent application last year or so (yes, you can patent the silliest "don't we know that already?" ideas).
And it surely is not "the lens". Because: A. Lenses just can not cause a double image, and B. Imaging resource showed a comparison from an A55v with the same 18-55 kit lens as on the A560. Ghost flash light images for the A55v, not the A560.
And other lenses from users also show it.
I can see what you mean. However, I'm not 100% convinced that the cause is really the mirror - the effect should be more gradual I think. I just had a look at their sample gallery and I didn't really find something obvious.
Here's a typical candidate according to your logic:
http://masters.galleries.dpreview.com.s3...489311.jpg
Lots of hard contrasts in there yet there's nothing suspicious as far as I can tell.
However, I've seen images with the same kind of "ghostings" in another scope - produced by the Pentax FA* 80-200/2.8. And according to Pentax this was a normal behavior of that lens (caused by internal reflections).
Anyway, my A33 will arrive during the next few days and I will have a look.
[/quote]
I am sure there have been lenses in the past which have produced ghost images of some sort. They never produce an image with an off-set copy of the original image like we see here, though.
And it is not just my logic, others have come to the same conclusion. People have even warned about this possibility when the use of beam splitting mirrors was only still a patent application last year or so (yes, you can patent the silliest "don't we know that already?" ideas).
And it surely is not "the lens". Because: A. Lenses just can not cause a double image, and B. Imaging resource showed a comparison from an A55v with the same 18-55 kit lens as on the A560. Ghost flash light images for the A55v, not the A560.
And other lenses from users also show it.