I own an Orion Starblast 4.5 and would like to know what would be the most powerful eyepiece I can use with it, say for Moon and planets. I currently use a 4.5 mm Antares (Plossl, I guess) and Soviet 2x Barlow (TEL?). I've watched the Moon with this setup yesterday but found it hard to get a decent focus... wich wasn't the case with my Celestron 8-24 zoom EP. Am I pushing the scope's limits? Bad collimation, perhaps? I use the simple collimation cap provided with the Starblast.
Thanks for your help!!!