"Dennis Persyk" wrote in message
om...
IC405 is an emission nebula glowing richly in red H-alpha light. By
employing a selective spike filter that passes only the H-a emission
line, one can block out light pollution and even the effects of a
nearby full moon.

You may view filtered and non-filtered views of IC405 that illustrate
the unique properties of the H-a filter at
http://home.att.net/~dpersyk/new.htm

I hope you will take a look and find the comparison interesting.


Ahah! you have stumbled onto my secrets, Dennis!

I love to image faint nebulae during full moons with emission line filters.

Here's a 12.66mag planetary shot with Ha, [OIII] and [SII]. This was taken
under a FULL MOON.

http://www.rdcrisp.darkhorizons.org/pk164_page.htm

here are some IC405 shots taken with various emission line filters.
Unfortunately they are rather undersampled.

http://www.rdcrisp.darkhorizons.org/ic405_Ha_page.htm

Keep up that good Ha imaging. I suggest you get an [OIII] filter too. That
camera of yours will work even better with [OIII] because the quantum
efficiency is better at that wavelength (500.7nm).

Best regards
Richard