Ryderscope
04-02-2023, 03:25 PM
Given that it was my birthday in January I decided to shout myself and new toy and acquired an Askar FRA300 Pro OTA to pair with my ZWO ASI6200 full frame CMOS camera. I like the specifications for the Askar FRA300 as when it is paired with the ASI6200 it provides a field of view of about 6.8d x 4.6d for an image scale of 2.6" / px. A slightly reduced field than when using the 200mm lens that I have been for a noticeable improvement in resolution. The FRA300 is petzval design as well which are designed to have a flat field out of the box obviating the need for additional field flattening or focal reducing hardware. From my testing with the FRA300 so far it is in line with these specifications. This particular image is taken with a 48mm adapter in the image train connecting the OTA to the ASI6200 filter wheel whilst I am waiting for a 54mm adapter to arrive.
The image has been processed from 19 Ha subs @ 900s all captured on Wed night/Thu morning 1/2 Feb with a 90% moon about. Processed in Pixinsight and calibrated with darks and flats.
Link to image on Astrobin here. (https://astrob.in/h0b37l/0/)
Clear skies,
Rodney
The image has been processed from 19 Ha subs @ 900s all captured on Wed night/Thu morning 1/2 Feb with a 90% moon about. Processed in Pixinsight and calibrated with darks and flats.
Link to image on Astrobin here. (https://astrob.in/h0b37l/0/)
Clear skies,
Rodney