I should also add that with your type of T2 adapter, you should be at 55mm now. It appears as though your T2 adapter already has the correct length of backfocus length to go with your camera's lens flange distance. These types of T2 adapters put you at 55mm, usually.
Explore Scientific iEXOS-100 and EXOS-2GT (non-PMC)
Explore Scientific ED 102mm Refractor