Here's a trivial question for everyone
You've setup your system and you're just getting ready to image Saturn with a web cam and you want to make sure your focus is spot on. You decide to use a hartman mask to assist you. As luck would have it Gemini is right next door to Saturn with Castor and Pollux shining nice and bright just below Saturn. Now, we all know that Castor (Alpha Gemini) is brighter than Pollux (Beta Gemini, well not really but we'll leave that bit of trivia for another night) so it would be much easier to see Castor using the Hartman and webcam. Right?
Well maybe
You will have difficulty using it. You should use Pollux.
Why?
Lets see who get this right first.
Good luck
Answer next week if noone gets it
Paul