Bulent, you really made me curious. So I went and looked up the focal
length distribution of this zoom lens...
This is what I've found:
By far the most used FL is 17 mm, second most used is 70 mm, which is
rather natural - as far as typical usage pattern of a zoom lens goes.
Then the FLs from 34mm to 63mm together amount to approximately the same
number of frames as 70mm...
Nonetheless, I will do as Paul suggested. I will probably start with
70mm, then go down to 40mm and then finally try for 17mm hoping that by
the time I arrive there no correction will be necessary and that
correction at 70mm will be very close to that at 40mm...
Boris
On 1/25/2014 8:52 PM, Bulent Celasun wrote:
Hi Boris,
The sheet for a gadget (don't remember the name) I use for such
calibration says there is no right focal length.
You can either select the length you use most frequently (perhaps better) or,
select a length in the middle.
In any case, the calibration will not be perfect at 17mm and 70mm
(assuming you haven't calibrated for these).
In the absence of a physical defect and with a x3 zoom like yours, the
calibration should still work acceptably.
Bulent
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