However, this is not a Vivitar or Tamron, etc. The Sigma 600/8 has a
slide-out filter holder on the side of the lens almost back at the
mount. Easy to change filters with lens on the camera. With an extra
holder or 2, switches would only take a couple of seconds.
My suspicion is that only ND filters will work in this posititon (on any
brand) as the image is close enough to formed that waterhouse stops
would cause vignetting. I think this partially for vaguely formed
theoretical reasons, but mostly from the fact that nobody has ever done
it on a commercial product. I can't imagine that some manufacturer would
not have tried to get a feature jump on the competition (and an actually
useful feature, at that) if they could figure out how to do it.
Moose
Jeff Keller wrote:
Unfortunately the filter on a Vivitar Series 1 resides inside the T-mount so
changing the filter involves taking the camera off
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