Re: [APML] 6 degree Gamma Cygnus field

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

Hi Herm and thanks.

> 1. thinking about taking the plunge into TP composites.. is this something
> that can be done by just switching camera bodies in the same night?.. will
> focus change be required due to the different thickness of the film?

Not that I have noticed but advice from I believe Chuck Vaughn was to use
thin scotch tape on the pressure plate for the TP camera. I've done this for
my 35mm TP but not my med format. Both seemed well focused. Just be sure you
keep that TP dry down in that Florida soup <g> Even when it's sitting around
not on the telescope.

>
> 2. if the E200 is used for the color data, and thus is not required to be
> too sharp why take multiple exposures?

On my composites I usually do a couple of interations of TP-color
composites. One of them will usually be a luminance composite typically at
30-40% opacity and the other is often a color composite of normal
combination. The color data will be much more important for this combo so
therefore the need for stacking.
Bobby

>
> "Bobby Middleton" <bobm@koyote.com>  wrote:
>
> >Here's my next effort from the Nov dark period. It is another Tak BRC
> >mosaic, this time of the Gamma Cygnus nebulosity around Sadr. It; like
the
> >last one I posted, is an E200-TP composite. The mosaic is 3 frames with
> >exposure times each frame = 2 x 60 min E200 + 1 x 50 min TP.
> >http://www.koyote.com/users/bobm/GammaCygnusWidefield.htm
> >Comments again welcome,
> >Bobby Middleton
>
> Herm
> Astropics http://home.att.net/~hermperez
>
>
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