Re: [APML] Re: Star Measuring WAS: Horsehead and Pleiades testshots with 6x9 camera/OAGand BRC

["tan@home.com" <tan@home.com>]

Based on my limited experience, I have found that for film imaging the 
size of the CO, whether it is 0% or 50% is no where near the limiting 
factor in resolution. The caveat here is that the FLs of the scope be 
moderate which is what most of us are doing.

However for CCD imaging, you can get a detector size which is quite a 
bit smaller than the typical film grain size. Under these conditions, 
the resolution of the system can be very high. Furthermore, in practice 
one can use an AO-7 device for tracking. As such it would be capable of 
getting us a lot closer to the achievable resolution of the optical 
system. This is when the CO will begin to matter.

Loke



Aplanatic@aol.com wrote:

> Tony,
> 
> 
>>Bottom line in all of this theory... rare is 
>>the night when the seeing will allow 
>>theoretical performance... unless you are 
>>the HST. 
>>
> 
> Good point.  Even with a 1 meter focal length instrument with close to perfect optics, it's very rare to actually acheive the theoretical resolution of the optics + film or optics + CCD combination because of seeing.  If you get ~30 micron star images with a 5" f/8 refractor on color film, you're doing quite well indeed.
> 
> Dave Rowe
>  
> 
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>
> 



--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>