I am not a huge fan of birding, but I captured this “Seagull” with pleasure. Initially, I noticed on my wide-angle photo, that there is a giant nebula north of Sirius. I checked in Stellarium what would be the optimal focal length and found out that this is a perfect target for William Optics RedCat combined with an APS-C sensor. Moreover, I was able to fit the M50 open cluster into the field of view (on the left side).
|Telescope||William Optics RedCat 51/250 f4.9|
|Focal length||250 mm|
|Mount||Rainbow Astro RST 135|
|Autoguiding||ZWO 178MM, QHY Mini Guide Scope 30/130 mm|
|Camera||ZWO 071 Pro @-10°C|
|Filters||Optolong L-eXtreme 2"|
|Exposure||85x180s, gain 95|