previous page in this Vignetting
article
The last type of vignetting discussed here is Optical vignetting.
Optical vignetting may be from the lens , the camera body , or just be
something that happens from using a combination of the two.
Optical vignetting occurs when an obstruction prevents light from
illuminating the image plane evenly , from edge to edge , corner to
corner.
¨Why would a camera or lens have obstructions that can do this
??¨
Its not always the camera or lenses fault , It is just the way things
must be made.
Lens makers have to walk the fine line of compromise of what they
physically and optically CAN and CANT NOT do , and STILL make a lens
that performs well over the full range of focus and apertures.
At the same time being bright , sharp , have good colour transmission
but not be prone to flare , too heavy , too hard to use or hold , too
big , and especially , not go over the companies projects budget.
I am sure there are alternative lens designs out there that might
perform awesomely but are impossible to construct within the guidelines
set out above.
¨Does the Kiev60 suffer from Optical vignetting ??¨
SURE DOES !!
To understand this your going to have to use your imagination and look
at my less than perfect graphics I have made.
Remember once again that vignetting is UNEQUAL illumination.
The picture below shows my Kiev with the back door open and the shutter
open with a smallish aperture.
