On a perhaps unrelated point - can anyone explain what is/are the design/performance differences/purpose between the Televue Nagler T5 range and the Televue T6 range of Nagler eyepieces?
Asides from the obvious size differences between a 31mm T5 Terminagler and a tiny 13mm T6 Nagler - is there anything else specific to these differing designs?
I suppose I am really trying to understand what is the differences (other than 3mm) between the 1.25 13mm T6 Nagler and the 16mm T5 Nagler