Eps Aur photometry with small telescopes .. anybody?
My standard DSLR + 55 mm lens procedure for eps aur is now becoming more and more impractical. Either I wait until it's reasonably dark (but then get a lot of extiction because of high air mass) or I have to cope with a bright twilight sky background.
So a cure might be to work with a longer focal length. I have a 6" f/8 Newton , and last night I finally had the opportunity to take some test shots.
I'm not sure when I will find the time to process them, but already some challenges are obious:
* you won't get eps Aur and comparison stars into the same field: one has to do photometry with the different stars on different frames.
* Because of the brighness of eps aur, with this kind of aperture you'll collect a lot of photons, so avoiding saturation requires a) heavy defocusing and b) shorter exposure times than you would like. So to fight scintilation effects you'll have to shoot lots of frames and average the results, I guess. or put some partial cover in front of the aperture.
Is anybody else tring something along these lines ?
I'll post more once I have my images post-processed.