SV: [APML]: Is f/7 too slow?

["Jonas Carlsson" <jonas.carlsson@mbox322.swipnet.se>]

Hi Paul,
Congratulations on buying a classic scope! Im sure you will have lots of
nice moments with it.
It's not a big differrens between a f/6 and a f/7 scope. I have a 10"/f7
Cave mirror in a home built scope and the contrast is very good. I think
your exposures will be about 25-30 % longer than with a f/6 scope but how
about all S-C with f/10?
Clear Skies
Jonas

----------
> Från: Paul Sterngold <psterngold@hotmail.com>
> Till: astro-photo@nightsky.com
> Ämne: [APML]: Is f/7 too slow?
> Datum:  den 3 januari 1998 19:46
> 
> 
> Yesterday I bought a used Cave 8" f/7 reflector on thier "premium" hd 
> mount.  I thought it was f/6 until I removed the mirror to clean it, and 
> read the engraving on the side.
> 
> I'm concerned that f/7 may require too long exposures.  Does anyone use 
> an f/7 scope and find it satisfactory?  Also, can anyone recommend a 
> focal reducer for it?
> 
> Clear skies,
> Paul
> 
>
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