What was the focal length(s) used for the two photos, Alan?
Oh I forgot. They were shot at the wide end.

Also, was the Nikon rig mounted to the ball head by the lens' tripod
mount?  (I'm assuming that the Pentax rig was mounted at the base of
the SP.)
Correct.

Upon first look, it would seem that the A 70-210/4 did a pretty good
job against its expensive (or so I'm assuming) competition.  I think
that the Nikkor seemed to show a slightly higher contrast and a
slightly higher resolution.  But, in both cases, it would seem (at
least to my untrained eyes) that the differences are really quite
small.  As for the SP's shutter vibration, damping it might make the
resolution differences even smaller, I would think.
That's my observation too. Also, this particular Nikkor was very soft at 200/2.8, so soft I thought I made a mistake. For the SMC, it the sharpness didn't improve too much by stopping down. However, these 2 lenses were rated by photodo 4 & 2.2 respectively, so I must be missing something.

regards,
Alan Chan


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