On Tuesday, July 19, 2016 at 11:16:10 AM UTC-7, wrote:
On Tuesday, July 19, 2016 at 2:08:46 PM UTC-4, StarDust wrote:
On Tuesday, July 19, 2016 at 9:43:35 AM UTC-7, Chris L Peterson wrote:
On Tue, 19 Jul 2016 09:24:59 -0700 (PDT),
There's another factor, the cooled camera, longer the exposure more photons it collects.

Cooling reduces noise. But the noise level of the camera is
independent of the type of telescope. Regardless of camera, exposure
time is determined by aperture.

of course a larger diameter telescope OTA , has more resolution, also collects more photons!

In a few cases the relationship between aperture and resolution may be
important. But usually, resolution is determined by the atmosphere.
The higher resolution of a large aperture scope is usually more
apparent to visual observers, who can take advantage of fleeting
moments of excellent seeing in a way the imagers generally can't.

I've seen some images with SCT, because the large CO, the stars look very bloated.

No. A large CO does not produce bloated stars. It was either a scope
with poor optics, it was the result of poor collimation (very common
with SCTs), or some other factor.

Well, my C 11 SCT, does have a large airy disk around stars for sure!
More magnified the more it shows.
So, you don't think a camera would record that?

The Airy disk size is directly proportional to the focal ratio.

No sht? How about the CO, ingenius?