Quote:
Originally Posted by Craig_
Ah right, for some reason I thought Antlia was priced quite a bit higher. I guess in that case one must choose between the narrower bandpass and the bigger halos?
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Yep, that's it. For me, there's another factor as well... I have Astrodon LRGB, and they're 3mm thick. Antlia are 2mm thick, Astronomik 1mm thick. Those differences shift the focus point of the imaging camera when I change between the filters. I use an OAG, which for obvious reasons is in front of the filter wheel, so this basically meant that I couldn't do LRGB and NB in the same night in an automated imaging run because the guide stars would go too out of focus. The Antlia and Astrodon are close enough that I can position the guide camera mid-way between best focus for the LRGB and NB filters and still get reasonable guide stars for both... so for me, the Antlia is still the winner, but I'll probably replace the O with an Astrodon at some point.