So, I live around latitude 56 (yay). Is it possible or worth it to shoot in the summer when we loose proper darkness? I've been looking and can't seem to find a comparison. I'm doing mono.
Shooting in the summer from a high latitude
I live around latitude 56 as well, in Denmark. Sadly it's impossible to get any useful data from start june to middle july (unless you're a radio astronomer).
I live 53.2 N and I can manage with the use of dual NB filters. Short sessions though. In your case tight NB filters should allow you to do some work.
I lived at 56N for 24 years and had an observatory for half that time. For me a month either side of the summer solstice was equipment and observatory maintenance season. It might be possible to do a bit with narrowband filters, or go after star clusters, but short of switching to planetary and solar imaging those long days keep deep sky imaging out of reach.
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Also live at 56 degrees (latitude not temperature, not yet anyway). May till September is no point taking out the astro gear other than for cleaning.
Another 56 degree person here. As someone who travels to a dark site summer is even worse. A million mosquitos out there in the damp rural areas and whatever darkness we get it only starts at 23 pm or later. Oh and don't forget crazy fog when temperature drops from a hot day to a chilly night. At least the only other animals we get are rabbits and foxes, no scorpions like in Arizona 
Engaging
Looks like I will spend the time building an observatory
Looks like I will spend the time building an observatory
Time well spent! Building my observatory was my single best investment in the hobby.
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56 N is tough, even at 51-52ish I can see the light from the sun just barely peaking over the horizon in the summer during the dead of night. My only advice is try and shoot to the south if you can, but you will have a month or two where its just not feasible.
Vistors From Down Under
June is the latest that I have been able to go.
Vistors From Down Under
June is the latest that I have been able to go.