Got a new RASA 8" telescope and would like to find a proper camera for it. I'm not planning to use the scope with filters, for the ease of use I would like to use an OSC camera. So I'm not sure if a Zwo Asi 183MC Pro or the Zwo Asi 294MC Pro is the better choise.
I started with some theoretical thoughts:
While the 294 camera has almost the ideal sensors size for the RASA 8 (perfectly illuminated field) it has a pixelsize of 4,63µm. The 183 camera has a quite smaler sensor (diagonal ~16mm) but has a pixel size of 2,4µm.
Using the formula 206*pixelsize/focal lenght to get the arcsec/pixel for the RASA 8-camera-combination, I get for the 294 camera 2.4 arcsec/pixel and for the 183 camera 1.3 arcsec/pixel. Let's assume a not that perfect seeing and some tracking issues and so on and assume the resolution I will get on a good night is in the range of 3 or 4 or 5 arcsec. Using a 183 camera with 1.3 arcsec/pixel the sensor would be capable of giving a resolutions of 3.3x it's arcsec/pixel value, that is for the 183 cmaera 4,29 arcsec, well in the range of my approximated seeing. Using the 294 camera with 2.4 arcsec/pixel, the sensor is only capable of giving a resolution of ~8arcsec - well below my average resolution due to seeing condiction etc.
So now I'm not sure what's better: larger field, but very much undersampling the average seeing with the 294 camera.... or a smaller field but a very good fit of the sensor resultion for my expected seeing with the 183 camera.
I read and saw the users got some nice pictures with the 294 camera (e.g. Trevor from Astrobackyard). What do you think? What would be your choise and why?
Looking forward to hear your opinion :-).
P.S.: The Zwo Asi 1600 camera is no choise for me, cause it's a mono and I don't find a dealer still listing the color versions of this camera here. If available the 1600 MC color camera would be my first choise because of large sensors and a pixel size in between the 183 and 294 camera...
Edited by Monsy, 16 September 2019 - 06:16 PM.