That's called focus bracketing.
Another trick you can use is to get another lens cap and drill two holes
in it on opposite sides near the outside edge. Put the lens cap on then
focus the camera manually. When the double image that you see becomes
one, you are in focus.
I will say that you are not using the best possible lens choices for
astrophotography. Zooms have way too many elements. Pick up a 50mm
f/1.8 (even the series II) and you'll get better results.
Mr. Bill
Ken Lin wrote:
Why not just take a few test shots and vary the focusing slightly between
shots and take notes of the focus setting near the far end, then use the one
setting that works the best?
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