Re: [APML] Lagoon and Triffid Region

["Bobby Middleton" <bobm@koyote.com>]

Now we can see it Loke. Thanks for the big file. There's lots of detail in
that huge piece of sky.
The mosaic work gets most difficult when there's lots of uneven illumination
across the field. If you're doing much to fight that with the tri-color work
already, then it would be not so easy to mosaic with your Schmidt. But if
your illumination is pretty even then it might work OK.

Boy I bet a 12-14" Schmidt would be something.
Bobby Middleton


----- Original Message -----
From: "lkt" <tan@cox.net>


> Bobby,
>
>  Thanks. I have not done mosaics with the Schmidt. I am sure it's
> possible but I expect it to be a lot of work. Actually, I have never
> done any mosaics with anything <g>.
>
> Here is a much higher rez version.
>
> http://www.starryscapes.com/tmp/m8_m20_wide_large.jpg
>
> Let me know what you think. I believe this resolution is getting to the
> breaking point. If I had to guess the resolution of the 8" Schmidt with
> TP is somewhere between that of a 5" to 6" refractor with color emulsion
> but with a noticeaably larger field.
>
> Loke
>
>
> Bobby Middleton wrote:
> >
> > Really deep Loke. The HC110 plus the red channel composite was excellent
> > strategy for this high dynamic range target. Schmidt cameras are just
> > capable of sooo much with the TP. Excellent work. Would you post a high
res
> > shot for us to see just what that Schmidt camera is capable of on TP?
> >
> > Have you ever attempted mosaics with the schmidt shots?
> > Bobby Middleton
> >
> > ----- Original Message -----
> > From: "lkt" <tan@cox.net>
> > To: <astro-photo@seds.org>
> > Sent: Wednesday, May 29, 2002 3:54 AM
> > Subject: [APML] Lagoon and Triffid Region
> >
> > >
> > > OK, here is another shot of the M8 (Lagoon) and M20 (Triffid) region
in
> > > Sagittarius. This was taken with an 8" F/1.5 Schmidt camera with
> > > tricolor filters on hypered Tech Pan. HC110 Dil. B was used to process
> > > the film for 14 mins. This developer was selected due to the extreme
> > > brightness of the core of M8 and M20 which means that the image would
> > > have a lot of dynamic range. Even so, the red channel was done with a
> > > composite of a 5 min and a 25 min exposure with a #92 filter. The long
> > > 25 min exposure with the #92 filter can extract a lot of the red
> > > nebulosity in this region but the cores of M8 & M20 were saturated.
More
> > > exposure data is on the webpage. Comments are welcome.
> > >
> > > http://www.starryscapes.com/nebula/m8_m20_wide.html
> > >
> > > Loke
> > >
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