The DA* 300 is a good choice for a try on deep space objects.
Extreme sharp and good contrast, f4 is rather fast and the lens is small and lightweight - so very handy in the field!
Here is a first try from December 2019 - the Andromeda galaxy with the K1 and DA* 300 at f4 and ISO3200
For there is a bad light situation in my home town, this is a stack of about 100 shots, each at 20s (I think longer exposure is possible ...depends on the quality of the calibration of the astrotracer)
The spikes at some stars is a result of post processing.
Last edited by bratzmahn; 06-27-2020 at 02:46 AM.