Please forgive my ignorance on the matter, I'm literally learning from scratch with all of this!
I purchased this
variable T-Adapter so that I can use my eyepieces with a Canon 550D attached.
I've found that the 25mm eyepiece that came with the package works fine, however I don't seem to have enough focal depth(?) for the 10mm to work?
Can someone please tell me how I've gone wrong with this?
