Re: [APML] Another September Image

["John C. Mirtle" <spampit@shaw.ca>]

Richard,
    You are right - the SII, Ha and OIII filters really do bring out some
interesting structure in the nebula. I would like to try this tri-colour
using tech pan in my Schmidt, but it would require full aperture filters.
Glass filters in the light path would knock it way out of focus.
    Just a minor point, but one of you guys has IC1396 flipped E/W......

For another wide-field view for E/W orientation, try the top image at:
http://members.shaw.ca/jmirtle/ha.htm

John Mirtle
Calgary, Ab. Canada

----- Original Message ----- 
From: "Richard Crisp" <rdcrisp@earthlink.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, October 21, 2003 8:44 PM
Subject: Re: [APML] Another September Image



that's a nice 1396. Here is a very widefield view of it in Ha, OIII and SII
filtered light, sorry but it is a CCD image:

http://www.rdcrisp.darkhorizons.org/ic1396_S2HaO3_page.htm

I like how this filter set lets me see more detail in the central region
than I do with either color film or standard RGB CCD images. The narrowband
"nebular diagnostic" filters, namely [SII], Ha and [OIII] really do reveal a
lot of otherwise latent structure, or at least improve the contrast of the
structure. Seeing how the [SII] line is at 673nm and the Ha is at 656, both
are normally showing up as RED in the standard RGB or color film renditions.
But assigning [SII] to red and the Ha to Green really makes for some great
contrast.

It would be really interesting to see this done with Techpan as a tricolor
image using the same filters!

rdc

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