Re: [APML] Another September Image

["Richard Crisp" <rdcrisp@earthlink.net>]

----- Original Message ----- 
From: "Jon Kolb" <jkolb@datawest.net>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Tuesday, October 21, 2003 7:06 PM
Subject: [APML] Another September Image


> Here's another one I shot last month, of IC1396 in Cepheus.  Not the
> best rendition ever seen, but certainly my best my best attempt at this
> object in six years of shooting at it.  The image posted is barely
> cropped at all - just enough to get rid of a raw edge from scanning, so
> it shows the vignetting from the Pentax 67 camera body and the TMB field
> flattener.  90 minutes on E200, unpushed.  I had another shot of this
> from a different night on Provia 400F that I intended to stack, but I
> botched the composition, and since it takes up most of the frame, there
> isn't much room for error.  Even without the 400F shot involved, I'm
> pretty happy with how VDB 142 shows up, along with all of the dark
> globules in this area.
>
> http://home.datawest.net/jkolb/ic1396_tmb152.htm
>
>

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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