Help with Tele Vue Nagler Eyepiece choice?

The 12mm is a Type 4 design, quite large and heavy (16.2 oz.), expensive ($350) but with long eye relief (17mm). The 11mm is a more modern design, lighter (6.7 oz.), more compact, less expensive ($290) but with shorter eye relief (12mm). The 11mm has a 1.25" barrel, the 12mm a dual 2"/1.25" barrel. I own an 11mm myself, and am very happy with it.

Hi Wally - I guess the 11 is an older model that some folks think is better - sharper or clearer with one less optical element. I have a 12 that I use frequently. I have never done a comparison. I like my 12 just fine.

ADDED: Geoff is probably right. The newer Type 6 11 mm is a lot lighter. I am still pleased with my 12, but I would probably lean toward the 11 if I were to choose today.

ADDED (2): On second thought, I probably would not. The 1.25 in barrel would require that I either change out the back and the diagonal, or add an adapter. Adapters are ugly and sloppy and weigh as much as the difference involved in the eyepiece change - so - I am back with my 12 mm, happy as a pig in slop so to speak...