[AZ-Observing] Re: Green Laser-Pointers as Scope Finder Pointers
- From: Tom Polakis <polakis@xxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Sun, 12 May 2002 16:25:08 -0700
At 04:06 PM 5/12/02 -0700, you wrote:
>They [laser pointers] will pretty much eliminate astrophotographers from
any organized star parties...
Before this discussion gets further out of hand, here's a link to my
observations on laser pointers at a dark site.
http://groups.google.com/groups?q=insubject:laser+author:polakis&hl=en&safe=
off&selm=3CB9C46C.6F25A3BC%40cox.net&rnum=1
My estimate was 15 feet off axis. Paul Dickson's was a more conservative
30 feet. I doubt that an astrophotograph is going to pick up stray laser
beams, as long as they are kept pointed skyward. The only way to tell will
be to take simple sky-brightness-limited exposures with a wide lens at
varying distances from the laser. I bet my Nagler collection that it can't
be seen from a distance of 100 feet in a one-hour exposure on ISO 400 film
at f/2.8. And if you are setting up to do long-exposure, wide-angle
astrophotography any less than 100 feet from the nearest visual observer,
then you're too close.
Tom
---
Tom Polakis
Tempe, AZ
Arizona Sky Pages
http://www.psiaz.com/polakis/
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