Ok so im not really new to planetary so i understand the basics. and ive looked at the FAQ page which is nice and helpful but i have a few things that are still just being bounced around my head and i would like to discuss.
just and fyi to get it out of the way, My scope is a celestron 127mm mak and i use a asi585mc and i use an orion sirius (same as heq5) mount. both scope and camera are fairly new to me and im learning from experience. I came from a big dob and had an 8" sct for a while.
Anyway ive been trying to figure out the best barlow to get for my scope (F/12.5) and camera (2.9 pixels) setup. Ive read a bunch of info on google and these forums and i get the 5x pixel rule and i also get that im supposed to match the barlow and scope to get me close to that pixel rule. so 2.9 x 5 = 14.5 my scope is native at 12.5 which is pretty close. a 1.5x barlow gets me around 18.75 and a 2x puts me at 25.
this is where i get sorta confused. I have looked and imaged at native f/12.5 and with a 2x barlow at f/25 and the barlow seems better in my eyes and in my images. but in threory native should be better right? because its closer to the 5x rule of 14.5 for my camera, also ive looked at others who have imaged with the same scope and a 120mc (3.75pixels) using a 3x barlow (f/36) and got better results that i can get. How and why (minus the obvious seeing and conditions)?? is it because the 5x rule on the 120mc puts it at 18.75 and thats pretty much half the F/36 they are pushing with the scope?? does that add up to being ok in some way?
I really wish there was a local telescope guru around my area that could just come make it all work for me, but im alone and rely on the internet for help. so help me obi-wan telescopey your my only hope. lol
Also im not very smart and math isnt my strongest area, so if possible keep it simple and use small words. lol