Re: [APML] Copygraph finished and hypering Q

["John C. Mirtle" <jmirtle@shaw.ca>]

Agreed Kent - for long exposures. Brian, why ARE you shooting the moon with
hypered TP? If you need hypered tech pan to shoot the moon, then I think
that your new copyscope might possibly benefit from some slightly faster
optics! :-) You might want to save the hypered stuff for H-alpha work where
you need the performance......

John Mirtle
Calgary, Ab. Canada


----- Original Message -----
From: <kgkirkley@aol.com>
To: <astro-photo@seds.org>
Sent: Tuesday, March 11, 2003 9:57 PM
Subject: Re: [APML] Copygraph finished and hypering Q



John:
I think we're comparing apples to oranges.
Perhaps I should have questioned why he was wanting to use hypered Tech Pan
to photograph the moon, because it is a waste of good hypered Tech Pan. You
are probably correct that for short exposures (like 1/1000 to 1 sec.) and
bright light the speed isn't effected by hypering. However, for it's usual
application in astrophotography; ie. nebulae, galaxies, etc. with HA
filters,
long exposures (like minutes to hours), hypered Tech Pan does have an
increased exposure index over unhypered Tech Pan.

Kent Kirkley

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