[Aavso-photometry] Adequate FOV size?

[Tandy, David]

I'm about ready to buy a CCD camera to get started with a photometry program
(I'll also take the occasional pretty picture, too).  I'm a photometry
novice but I do have about a year's worth of CCD experience.

I have a Meade 14" F10 on a AP 1200GTO mount in a permanent setup.   My
polar alignment is good and the mount points well with the mirror locked in
the OTA. 

Obviously, a large FOV has advantages but a large format camera required to
get a large FOV at 3556mm fl is very expensive  I can always add a focal
reducer to widen the FOV but I've read that doing so can hurt the quality of
the observation due to the refractive nature of the focal reducer,
vignetting, etc.  

My question is:  Do I need a 30' x 30' FOV or is 10' x 10' adequate for most
type of photometric observations?   For most variable stars are the
reference stars within a few minutes of the target star?

My seeing is average so I'm thinking that a 1" or so pixel scale is good.
At F10, that translates to around 17 microns.  At F6.3, 10 microns.  It
seems like a 9 micron pixel chip would work well.  I'll be a bit oversampled
at F10, but that's better than being undersampled, right?  Plus, when I want
to shoot some pretty pictures through my widefield scope, 9 microns is just
about perfect.  Lastly, I've seen only one 16 micron pixel camera and it is
nearly $8k.

So, for such a long focal length setup (3556mm) am I going to need a larger
format camera (SBIG STL) or will a ST-8XE (9' x 13' FOV) be perfectly
adequate?    Any camera suggestions are welcome!

Thanks,

Dave