Click here if you are having trouble logging into the forums
Privacy Policy |
Please read our Terms
of Service | Signup and
Troubleshooting FAQ | Problems? PM a Red or a Green Gu.... uh, User
Simoes Pedro
member
Reged: 02/03/09
Posts: 16
|
|
For those who have used both 41 Pan and 31 Nag, can you please tell me whether the pan focuses inner or outer than the 31 nagler?
The same goes for the 17 Ethos. Does the 17 ethos focuses inner or outer than the 31 nagler?
Thanks.
|
FirstSight
Post Laureate
Reged: 12/26/05
Posts: 3897
Loc: Raleigh, NC
|
|
The 17E and 31T5 Nagler are parfocal (or extremely close to being such), i.e. the come to focus at the same position in focusers. As to the 41Pan vs 31T5 - I'll have to leave that for someone else to answer.
--------------------
Chris M., aka "First Sight"
Orion XT12i Dob with Moonlite CR-2 focuser
WO Megrez 90 refractor on UniStar Light mount
Nikon 10x50 Binoculars
|
Simoes Pedro
member
Reged: 02/03/09
Posts: 16
|
|
Thanks!
|
Mike Hosea
Post Laureate
Reged: 09/24/03
Posts: 3945
Loc: "Metrowest" Boston
|
|
According to Tele Vue here
http://www.televue.com/engine/page.asp?ID=144
(see column F), the 41mm Panoptic focuses
0.27-(-0.38) = 0.65" farther out than the 31mm Nagler.
The 17mm Ethos focuses
-0.39-(-0.38) = -0.01" father out, which of course means that you have to rack the focuser in by about a hundredth of an inch when switching from the 31mm Nagler to the 17mm Ethos. In practice these numbers tend not to be as precise as they appear, so I'd say a difference like that is parfocal.
--------------------
Mike
Stuff that I use:
- 7" f/6.7 home-built Newt, eq platform, Pentax 40XW and 5XO, Tele Vue 13E and 2x Barlow, ZAO-II 6mm
- 120mm f/8.3 home-built grab-n-go Newt with 7-21mm Nikon Zoom
- Canon 15x50 IS and Eagle Optics 12x50 Ranger binoculars
|
Simoes Pedro
member
Reged: 02/03/09
Posts: 16
|
|
From what I can understand. When takinig the 31 out and placing the 41, I will have to move the focuser out by o.65" to achieve focus. Right?
|
Mike Hosea
Post Laureate
Reged: 09/24/03
Posts: 3945
Loc: "Metrowest" Boston
|
|
Right, that's what the numbers are saying.
--------------------
Mike
Stuff that I use:
- 7" f/6.7 home-built Newt, eq platform, Pentax 40XW and 5XO, Tele Vue 13E and 2x Barlow, ZAO-II 6mm
- 120mm f/8.3 home-built grab-n-go Newt with 7-21mm Nikon Zoom
- Canon 15x50 IS and Eagle Optics 12x50 Ranger binoculars
|
Simoes Pedro
member
Reged: 02/03/09
Posts: 16
|
|
Thanks Mike
|
|
32 registered and 19 anonymous users are browsing this forum.
Moderator: Greg K., Jason B, csa/montana
Print Thread
|
Forum Permissions
You cannot start new topics
You cannot reply to topics
HTML is disabled
UBBCode is enabled
|
Thread views: 147
|
|
|
|
|
|
|
Previous
Index
Next
Threaded
Edit
Reply
Quote
[Re: 