Thanks for that. Very interesting tests, Bojan! So it seems that using a fast lens (ie f1.4) and faster speed is not really any good! I might as well put on my regular DA* Pentax and take the shots at F5.6 or so and risk a longer exposure. The lower the f stop, it seems the more purple fringing around the stars!
Calculation.... 10 sec at f1.4 = 20 sec at f2 =40 sec at f4 =80 sec at f5.6 Sounds feasible! I willl try tonight
