Steeply concave eyelens - Ugh

I have come to a definite preference - I hate steeply curved eyelenses. For me, the slightest bit of fogging that in other eyepieces goes unnoticed causes a bright object in the field to be surrounded by a very bright halo of light. When the curvature of the eyelens is just right, I get a bad halo around a bright object in the absence of any fogging.

I have sworn off the Tele Vue Radians for this issue - the 6mm was unusable by me for planetary viewing and the 14mm Radians I used for binoviewing had to be used extremely carefully to avoid a halo. Since few others report this annoyance, I suspect that the curvature of my eyeball is just "right" to cause me these issues.

The TV 13mm T6's show nothing of the halo, and my old 13mm Nagler and 9mm Nagler (original types) never showed this halo tendency either.

Philip

Philip --

Interesting. I've noticed this on the T6's as well. My Tak LEs, TV Plossls, T6's, and 19mm Panoptic all fog far too readily, but I only get the halo effect on the T6. (It's certainly more concave than the Taks or Plossls, but it appears about the same as the Pan?)

Anyway, I've sworn off short eye-relief, non-vented designs as a result. I now use longer Pans at the low end, Nagler T4's in the middle, and volcano-top UO orthos at the high end.

-- Jeff.