It is an unfortunate fact that many viewing locations skies are becoming less "dark", which is why I think this next request is increasingly crucial. I'm personally in Brooklyn (by the beaches where it's a bit darker) using an 18" Teeter f/3.7 and of course it's still challenging for DSOs beyond the popular object lists. So, it would be extremely helpful to add Surface Brightness (SBr) to the 'Object Info' screen but also to be able to Sort/Filter by that information. One of the formulas I have seen (from one of my favorite astronomy books "The Urban Astronomer's Guide") is as follows:
SBr = m +5 x log(d) - 5 x log(70) where SBr =Surface brightness, m=Visual magnitude, d=object size in Arcseconds
The popular example used is M101 -listed w/ a visual mag of +7.9 However, for most people viewing from local sites, a challenging SBr of 14.2.
So, it would also be really nice to sort the observing lists and searches by SBr (or SBr equivalent -whatever works for the programmers best). This way a person can begin to arrange a "Challenge DSO" list for themselves. When you combine this, w/ other requests (like for Filters, SQM, etc) observers can more quickly learn to stretch the perceived limitations of their scope & location -and improve their observation techniques to be able to bag those faint fuzzies.
Thanks so much!
FYI - I'm adding (and have already added) a bunch of requests only b/c I want to be able to drop my supplementary apps and save time at the scope. There's no disrespect intended - I love the program and in addition to SkySafari Pro, I also own Starry Night, SkyFi3 -and even SkyBT (which I rigged to use successfully w/ my Android phone back in the day). So basically, I'm your best customer ;-)