Re: [APML]: New Photos from 10/5-6/96

[Brad Barton <bbarton@holli.com>]

Chuck Vaughn wrote:
> 
>
> NGC672/IC1727 - A pair of SBc galaxies in Triangulum about 6'x2'
>                 each separated by 8'.

Chuck,

In the lower right hand corner of this picture, there is a "bright" 
star.  Right to the left of that star is a small dash.  Have you 
captured an asteroid, new comet or is it a defect?

Just curious.  

By the way, excellent pictures!  I'm continually stunned by the pics I 
see on this group.

Brad
> M1 - A 3 hour exposure through an H-alpha interference filter
>      shot entirely with the moon up. The film never new it. :-)
> 
> The links are at the top of my astrophoto page.
> 
> http://www.aa6g.org/Astronomy/astrophotos.html
> 
> It looks to me that on the NGC672 photo I managed to get the
> camera tilted very slightly so the stars are not as good as
> they could be across the entire field. The other two are fine.
> 
> After a test the previous day, I used Brad Wallis' suggestion to
> extend the development time of Tech Pan (I went 10 minutes) and
> use a continuous gentle agitation (about 6 RPM). I definitely got
> more speed out of the film but at the expensive of a grainy looking
> image. I also had some problem with uneven development. This was
> just a roll of Lumicon Tech Pan. The base plus fog was around 0.6.
> 
> I also employed the suggestion of reducing the concentration of
> my fixer in hopes of eliminting pin holes. One had a number of
> pin holes still but the other two had none. I don't know what to
> make of this. For information, I use an AR coated fused silica
> blank in the off-axis guider to limit dust that can reach the film
> during these long exposures.
> 
> It wouldn't be astrophotography without a few problems to solve!
> 
> Chuck Vaughn  <aa6g@aa6g.org>