Quote:
Originally Posted by koputai
Strange though, as my terrestrial macro shots look
fine. .
|
Well, not really... Star test is the most revealing of all tests you can do.. and many lenses (including the most expensive ones) will not pass it as satisfactory for astrophotography.
However, some much cheaper lenses will perform quite well actually... so here you go.
Also, macro lenses are designed for focussing on close objects.. while star fields are far away. Personally I don't have experience with Macro lenses, but I wouldn't be surprised if some designs would not perform well on stars... However I would expect symmetrical coma around star images, so something is definitely not right with your copy.
F/5.6 will certainly help.
And try to get rid of filter.. also try with external diaphragm (in front of the lens.. in general this works with longer lenses only)