Cheers Peter. Yes, I did have a look at that a couple of weeks ago. Though doing it via software after the exposure, doesn't allow you to finely focus an acromat on only one wavelength at a time. Might be a complete waste of time but it's something I'll experiment with when the astro budget allows
I did give the Lenhance filter a go on my Askar fma 180 the other night with a 98% moon was out - much more effective than I would have guessed:
https://www.facebook.com/photo/?fbid...78646270165063