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BV Eyepieces for C14

Started by tbennett, 01/05/2020 03:00AM
Posted 01/05/2020 03:00AM Opening Post
I plan on using a BV on a C14 with 20mm Widescan III eyepieces that have maximum FOV for 1-1/4" format.

Is there any advantage in having a lower-power pair of eyepieces (24mm Panoptics for example) since they would not provide any wider FOV than the 20mm?

I'm thinking the Pans would have better edge correction than the Widescans on a fast scope but in a C14 (at about F/14 with binoviewer installed) there wouldn't be much difference.

Thanks!

Attached Image:

tbennett's attachment for post 165940
Posted 01/05/2020 07:32PM #1
I use a pair of 24.5mm meades binoviewing with my C11 the most.....and a pair of 18mm occasionally as well. I use them with earthwin binoviewers that have the 3 position powerslide.

20" MidnighTelescopes f/5
8" f/16 Muffoletto Achro
Meade 6" AR6 f/8.0 Achro
Celestron C11
Parallax PI250 10" F/5 Newt
Vixen FL102S,NA140SS,R200SS
80mm Stellarvue Nighthawk with WO APOupgrade lens, 90mm f/16.67 Parallax Achro
LXD75/LX200, Mini-tower, GP-DX, CG5 ASGT, LXD650, GM-8, G11, GM-100, GM-150EX, GM-200 and a Gemini G40
4" portable AP convertable 44" or 70" pier
Stellarvue M7 Alt-Az, TSL7 Pier/Tripod
12.5" f/5 MidnighTelescopes DOB Swayze optics
Statham GA
Posted 01/06/2020 02:01AM #2
Thanks Greg,

I tested the 20mm WSIII in a F/7.5 refractor with 2X Powermate (F/15 total) and they are sharp out to about 85% from the center and even the edge is not that bad. Not sure that a getting a more expensive eyepiece would benefit binoviewer performance in a C14.

I noticed the barrel on this eyepiece only has filter threads on the bottom 1/4-inch and the barrel widens-out above the threads (see image) maybe to allow for a wider field stop? Could this be how it achieves wider FOV than other 1-1/4” EPs that have threading further up the barrel like a 24mm Panoptic or 32mm Plossl?

Attached Image:

tbennett's attachment for post 165948