05-22-2012, 09:03 PM
[quote name='Klaus' timestamp='1337720057' post='18447']
These are conventional ghostings that you will experience with all cameras and lenses in such situations. ~99.9% (roughly) of the light is transmitted directly to the sensor. ~0.1% is bounced back and forth creating such ghost images. Depending on the lens this can be more or less - it has little to do with the A33 (other than that the sensor is also reflecting light back towards the lens but this applies to all cameras anyway).
As a rule of the thumbs this is least pronounced with lenses featuring few lens elements and these elements should be all multi-coated.
I used the A33 for a while myself and I really enjoyed it. It's a good camera.
[/quote]
Not quite an accurate description of what happens. What actually happens is that light gets reflected back by the sensor, then goes through the lens system again. Normally it will go out the front of the lens and be gone. Now if you place a flat slab of glass in front of the lens, that outgoing light gets reflected back partly again, into the lens system. It goes through the focal point again, getting mirrored through the optical axis (that is why it ends up up side down. left side right, on the other side of the image). This then gets recorded by the sensor as party of the image.
Just about always the ghost light is caused by a filter. Only very few lenses have the ability to make a ghost light like that without a filter, this depends on the lens elements (there has to be one flat surface in front of the focal point).
Advice: do not use filters when they are not needed, ESPECIALLY in night photography where lights are very bright compared to the rest of the photo.
These are conventional ghostings that you will experience with all cameras and lenses in such situations. ~99.9% (roughly) of the light is transmitted directly to the sensor. ~0.1% is bounced back and forth creating such ghost images. Depending on the lens this can be more or less - it has little to do with the A33 (other than that the sensor is also reflecting light back towards the lens but this applies to all cameras anyway).
As a rule of the thumbs this is least pronounced with lenses featuring few lens elements and these elements should be all multi-coated.
I used the A33 for a while myself and I really enjoyed it. It's a good camera.
[/quote]
Not quite an accurate description of what happens. What actually happens is that light gets reflected back by the sensor, then goes through the lens system again. Normally it will go out the front of the lens and be gone. Now if you place a flat slab of glass in front of the lens, that outgoing light gets reflected back partly again, into the lens system. It goes through the focal point again, getting mirrored through the optical axis (that is why it ends up up side down. left side right, on the other side of the image). This then gets recorded by the sensor as party of the image.
Just about always the ghost light is caused by a filter. Only very few lenses have the ability to make a ghost light like that without a filter, this depends on the lens elements (there has to be one flat surface in front of the focal point).
Advice: do not use filters when they are not needed, ESPECIALLY in night photography where lights are very bright compared to the rest of the photo.