Kip Peterson wrote:
> For Christmas, I received from my spouse a Tele Vue 35 mm Panoptic
> eyepiece. Nice spouse, eh? Anyway, I was wondering if other LX200 10"
> f/10 owners with this eyepiece could comment on its edge-to-edge
> sharpness. I seem to note a slight edge coma, though not
> objectionable.
> Overall, the performance is breathtaking, but I was wondering if
> others noted the same lack of perfect focus edge-to-edge.
<snip>

I owned the 35mm Panoptic and tried it out on a f/9 refractor, a
f/10 SCT, a f/12 DKT, and a C-14 (I can't remember its f/ratio.)
All instruments were well collimated.

The edge-to-edge sharpness was extremely unacceptable. It was
not just coma - the stars in the outer 1/4 of the field were not
in focus. This was the same on all of the instruments. A much
older 35mm Panoptic was compared to mine on the C-14. The older
EP was definitely sharper to the edge.

My EP was returned to Televue.

I own other Televue EPs and have tried out most of the Panoptic
and Nagler line. This is the only TV EP that I had any problem
with.

<hearsay> A while back I remember someone alleging that Televue
had changed manufacturers from a Japanese source to a Taiwanese
source. If this is true this could account for the extreme
difference between the two EPs.

Take care,

Gene Horr

View index by [date] [author] [subject]
Previous message: Re: [M]: OAG recommendations for LX200, AstroDesigns-Ed Stewart
Next message: [M]: RE: OAG recommendations for LX200, Richmann, Michael
Previous message in thread: Re: [M]: 35 mm Panoptic results question, Ed Stewart-AstroDesigns