On Ven, 6 feb 1998 16:19, Rob Roy <mailto:royrg@xxxxxxxxxxxxxxxxxxxxxx>
wrote:
>Last night he showed me some astrophotos he had taken before he took the
>lens back to the store. I have never seen anything like them. The stars
>were football-shaped (astigmatism) and the brighter ones had blue halos
>around them (chromatic aberration). Any ideas as to what is going on? I
>have never even heard of such a bad lens!?
>
Maybe too long exposures and slight out-of-focus. You cannot set the lens
to infinity setting, you have to focus very carefully. I suggest your
friend to use very fast film, have 10 seconds exposures and to make
different shots adjusting focus every time.
Marco
mailto:tom@xxxxxxxxxxxx
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