I am experiencing vigeneting at approx 50 mm area now that I have fitted filter & correct lens hood for the lens, any ideas
The depth of the filter may be enough to push the hood into the visible area.
This will be noticable at short focal lengths. Remember that the image of the hood will be very out of focus, and so even if the edge of the hood would 'land' oustide of the image with a tiny aperture, the out-of-focus fuzz may impinge on the corners of the frame.
Also that the viewfinder area is usually a little less than the actual frame area so you may not see vignetting in the viewfinder that appears on the picture.
One possible solution is to mount the filter on the front of the hood. Some hoods allow you to do this, others don't.
If not your solution is a different hood.
(Note that deep hoods work better, as a certain amount of stray light reflects off the inner surface of the hood.)
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