Larry,
I do not know what is _typical_ for different Pentax cameras and lenses,
but from the general point of view, I fully agree with what David wrote.
Think about it this way: you have a set of deviation parameters
for the camera C1= {c1, c2, c3,c4, c5... }, and then a set of "coupled"
(sort of "reciprocal") deviations for the lens L1= {l1, l2, l3, l4, l5, ...}.
The number you get for each lens is an average number that sort
of minimizes the combined deviations {(c1,l1),(c2,l2), (c3,l3),...}.
Since each of those individual parameters are essentially random,
for a different set C2, the way you will need to minimize the combined
deviations C2*L1 could be very different from that for C1*L1.
So, in general, yes, for the best result, you want to calibrate each lens
on each camera.
However, I suspect that there will be some correlation. So,
your first scenario of calibration will give (with some good probability)
the result that on average [over all your lenses] is better than
in case you haven't adjusted the calibration at all.
Igor
David Parsons wrote on Thu Mar 17 22:19:46 EDT 2016:
The adjustments would only be similar if the two cameras were
absolutely the same. Tolerances will be different from body to body
and lens to lens, so you'd want to calibrate each lens to each body.
On Thu, Mar 17, 2016 at 7:03 PM, Larry Colen wrote:
I have been thinking of posting a related question. When you determine the
per lens focus adjustment for a lens on one camera, does that number tend to
work on another camera, perhaps with a slight offset.
For example if on camera 1 you have
lens A +5
lens B +2
lens C -1
would you use the same numbers? Or if lens A works out to be +4, could you
assume that the corrections would be
lens A +4
lens B +1
lens C -2
Or do they end up just being totally random?
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