[Aavso-photometry] Time series for GK Persei

[Michael Koppelman]

Except that a faster focal ratio will focus the light on a smaller  
number of pixels so that it may indeed saturate faster, if I'm not  
mistaken.

M.


On Mar 23, 2008, at 3:19 PM, Jim Roe wrote:
> I'm afraid this is a common misconception.  F/# does not improve the
> exposure of point sources (like stars) - aperture rules!  F/# impacts
> exposure of extended objects like nebulae.