[wavelandscott (Scott)]

Depending on your need for eye relief and what you want to look at I'd choose between the two.

Radian more eye relief, less field of view...Nagler (depending on series) tighter on eye relief but the field of view WOW!

I have a 13 mm T6 Nagler and a 16 T5 Nagler and a 24 Panoptic...There are all fine eyepieces and would gladly recommend them all...but, I don't wear glasses and don't mind less than 20 mm of eye relief.

Best to try one or two before you splash out even when they are on the sale.

I used to have an 11 mm T6 and a 10 mm Pentax XW...I kept the Pentax and traded the 11 mm T6 for the 13 mm T6...

I give a very slight (and I do mean slight) edge to the Pentax...Yes, I do miss the slightly larger field of view from the Nagler but in most other areas the Pentax was just a touch better to my eyes...I also have a 7 mm Pentax XW and would also highly reommend it.

The Naglers are wonderful eyepieces but I would strongly urge you to try them before you buy...Each of the series T4, T5, T6 (etc.) have slightly different characteristics that make them different...I've known people who loved the T6s and did not care for the T4s and so on...

Good Luck with your choice...I am sure you will get enjoyment from either choice!