Cheers RB/Dennis, I usually equal the number of darks to the lights taken
I'll have to organise a library or something its not fun taking 10+min darks on a frosty night.
RB embarrassed to write I took the easy way with a Light box from Astro-handy with adapters to fit my scopes. Used it for the first time the previous night with the C9.25 and a F6.3 fr, added a pic of M83 with 5 exposures at 5mins, first dso taken with this scope
