[Aavso-photometry] Bruce Gary's book and other material

[Michael Koppelman]

I've never understood those GEMs (like the Paramount) which force you  
to move the scope the moment it hits the meridian. A GEM can traverse  
the meridian and doesn't need to be moved for hours afterward. You can  
start 3 hours on one side and end 3 hours on the other. GEMs do not  
perform poorly at the zenith.

I'm not religious about this mount versus that mount but I have had  
great luck with GEMs.

M.


On May 14, 2008, at 1:21 PM, Jeff Hopkins wrote:

> I'll second the not recommended GEms. The best photometry is near the
> zenith where GEMs work the poorest. A fork mount is much superior.