RE: [APML] My longest shot

[Éder Iván <eder@prof.hu>]

Thanks Wade,

I will try to make this 3.5 hours, but i have to admit I'm afraid of 
getting some flexure between the main and guidescope. Do you use off axis 
guider, or different guidescope like me?

Thanks for the link, I've never heard about it. I will have a look at this 
site.

Just a bit about the importance of temperature. Last winter (at -10°C) i 
shoot 60 min for f/6, and i got brighter background on the slide then now 
with 120min at +16°C! And the sky was much better that time, then now. In 
this case there were a big difference between the speed (reciprocity 
failure, sensitivity, ...) of the slide.

Best regards,
Ivan


At 16:30 2005. 09. 19.t Conve, you wrote:
>Ivan,
>
>I have a really dark site and this is the approximate time needed to reach 21
>magnitude/arc second at F/5.0.  I'm not quite sure if there are any 
>fainter nebula
>to "discover"; however, it should make those already faint nebulas stand 
>our more
>clearly.  If it's really cold, I'll probably decrease the exposure to just 3
>hours.  As an aside, I can easily go 90 minutes at F/4.0 with E200 developed
>normally.
>
>Wade
>---- Msg sent via @bmi.net Mail v4 - http://www.bmi.net
>_______________________________________________
>Astro-Photo mailing list
>Astro-Photo@seds.org
>http://seds.org/mailman/listinfo/astro-photo


____________________________________________________________________
Miert fizetsz az internetert? Korlatlan, ingyenes internet hozzaferes a FreeStarttol.
Probald ki most! http://www.freestart.hu
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo