Re: [APML] A few more barn door shots

[Jerry Lodriguss <jerry@astropix.com>]

Hi Eric,

That's interesting information about the barn door mount. You are having 
good success with you methods.

If you want more accuracy to go to longer exposures, you could also build a 
double arm mount. See:

http://hometown.aol.com/Davetrott/page17.htm

I'm guessing that the scans that Walmart would do would only be 
web-resolution. But if they were high resolution, and you had 24 images on 
a 650mb CD, each one could be 27mb. That would be roughly 2650 pixels per 
inch for the 24mm x 36mm size of a 35mm negative. That would be very high 
resolution.

Jerry




At 10:16 AM 6/30/2003 -0400, you wrote:
>Here's a link to a picture of the mount:
>
>http://members.aol.com/IC4703/equipment.html
>
>I have a small finder mounted, but I actually feel better about the
>alignment when I just sight down the hinges.
>
>The reason I went from getting maybe three or four round star shots per
>roll to getting round stars in practically every shot is a little
>embarassing: I assumed that given the inherent inaccuracy of a barn door
>mount, counting in my head for a few minutes would be adequate: wrong!
>Now I have an analog wristwatch attached to the back of the mount - I
>crank it manually, and once I started watching the seconds hand, I
>realized I have a tendency to rush through it.  I didn't post any of the
>5 minute exposures, since they were all wrecked by dew, but the stars
>were still good, so next time I'll stick to f/2.8 and shoot from 4-6
>minutes.
>
>Anybody know of an easy/cheap way to keep dew off the lens while
>shooting without adding much weight to the setup?
>
>As far as getting the images on CD when they are developed, I asked
>about the resolution and I couldn't get a good answer.  Cramming 24
>shots onto a CD means I can't possibly get better than 600dpi.  What I
>really need to do is break down and get a negative/slide scanner.


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