Image scale question for a 16” meade
Posted 18 September 2020 - 10:10 PM
Posted 18 September 2020 - 10:43 PM
Most modern cameras have small pixels. I think the common approach is to bin and up the scale. You can always image at 1x1 first and then at 2x2 and see if there is any gain in resolution. Tracking will need to very good to sustain that focal length.
Posted 19 September 2020 - 10:18 AM
Posted 19 September 2020 - 11:22 AM
Posted 19 September 2020 - 03:16 PM
Since I use a Meade 16 LX200, I'll explain my setup for imaging. I use a Starizona reducer/corrector for about 2500mm efl at f6.2. Coupled to an Atik 460ex mono CCD that I bin 2x2 yielding 9 microns/ pixel for 0.74"/pixel which is just about right for my average 2" seeing. Binning a CCD results in very low noise and very efficient gathering of photons. There are plenty of forum threads about binning a Cmos camera and that it results in no gain. I do have an ASI1600MC-cool that I use on my 80 APO, but test on the 16 have shown me that the Atik is far faster and less noisy. Of course, there are other things to do to the scope like replacing the standard Meade back plate for a 2 inch size and getting a micro-focuser or custom adapter to fit the bigger plate and moving to a Bortel 2-3 site to take advantage of the scope.
My standard imaging run is 9/5 minutes of luminosity and 2/5 minutes of RGB, a very short amount of time for many, but suits me fine. Average magnitude reached is 21. Field of view is small, about 17 by 14 minutes, so this rig is a galaxy getter, which is my passion. Just an example of that FOV and exposure time attached at 60% full size:
- michael8554 likes this
Posted 22 September 2020 - 12:36 AM
Posted 22 September 2020 - 08:52 AM
In my case, wedge, pier, bolted to one ton of concrete, I have not found a load limit yet. Scope usually has an 80 APO mounted on rails above the OTA and either another 80 or my Meade 4in sct mounted below. Then a camera, reducer, OAG, filter wheel combination out the back. The 80s have cameras too. Probably 30 additional pounds of gear.
Biggest problem for me has been cable management, just too lazy to sort it out, I guess.
Posted 22 September 2020 - 08:56 AM