Bright Star Wide Angle Camera Photometry?
Hello! I read the Sky and Telescope review of ZWO's new camera - ASI120MM - and it came with a 2.1mm wide angle lens that covers up to 150 degrees.
I had a strange thought. Could such a set up be used for for bright star photometry by pointing the camera straight up and taking images periodically without the need to direct the camera to different star fields?
The review article stated that the visible stars were captured on the test of the wide-angle lens. I scanned some other websites, and I wonder if the magnitude limit might be 8 or so, perhaps more with longer integration times?
When I checked the FOV with the 12D string FOV calculator, with 3.75mm pixels and the 2.1mm lens at f2.0, the coverage is 4.58'/pixel and the chip coverage 98 x 81 degrees (I'm not sure why this differes from the 150 degrees from the commpany).
Bright star photometry needs defocused stars, so defocus to FWHM of 10' would be reasonable? Additionally, long integration times are possible with the ZWO, though it is uncooled, so frequent dark frames would be needed.
With flats and darks, could this setup perform bright star photometry without the need to direct the camera? Simply point it straight up and take images when the star fields are above 30 degrees? Thank you and best regards.