If you put threads on the front, it isn't thin any more. 'Thin' isn't
just the glass and how it is held in, but the total protrusion from the
front of the lens. The bit that would stick out with the threads would
add to the possibility of vignetting, defeating the very purpose of the
filter design.
Moose
julian_davies@xxxxxxxxxxxxxx wrote:
That makes it doubly annoying that they don't put a thread on the front of
their own - brand thin mounts.
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