Thanks, Vlaiv
I'll have to try this out for myself one of these days. It would be great to be able to image smaller targets sometimes. Guiding more critical, of course. One thing though - it will obviously depend on the camera. For instance, my Atik383l+ has 5.4um pixels whereas my qhy183m only has 2.4um pixels. However, the 183m has a much higher qe - 84% vs a mere 40% (peak at 540nm). I guess if I were to attempt imaging with a x2 Barlow I'd still be better off with the smaller pixel 183m (but bin 2x2). I wish I had loads more imaging opportunities than I do so that I could try these things out. The proof of the pudding (is in the eating) as they say!
Louise