WO binoviewer in focus probem plus eyepice focus prob.

[inspectapart]

I just bought a new WO BinoViewer which includes two 20mm eyepieces and a 1.6 mini barlow.

However, I dont have enough in focus to acheive focus when using my diagonal. O/K without tho`(bend zee knees!!)

The other problem I found was that the eyepiece focuser on the left eyepiece comes to focus at a different position than that of the right eyepiece.The left eyepiece has to be turned down to the very bottom of its travel.

Do you think that there is a collimation problem?

I know that my eyes are pretty close to one another prescription wise and I have no problem when using ordinary binoculars.

The view that I got through the binoviewer last night on the moon and Jupiter was very rewarding but I can`t help wondering if the collimation may be slightly out because of the individual focusing difference.

Bob

[Kevin Ellis]

What telescope are you using.

[inspectapart]

Hi, I have a Vixen 102M , old but good.

bob

[Milamber]

Not a whole lot of focus travel there. Maybe try with the barlow the scope side of the diagonal (which is a 1.25" beast I assume?).

Arthur

[inspectapart]

Thanks Arthur, I did think about trying that. But last night I was so busy staring at Jupiter that 3AM came around before I could try it. Maybe tonight tho`.weather permitting. yes it is 1 1/4"

That is, on my knees `cos the damn diagonal won`t work!!

[Kevin Ellis]

I have not used them but speak to Siebert Optics about their Binoviewer correctors & OCA's

[WebSentinel]

Hi Bob,

I bought a WO binoviewer recently too and found the same issue as you with my new Megrez 72FD. In my case the issue is the result of the 2" WO diagonal. I can get it to focus if I use a 2x barlow (not including the 1.6 that comes with it) but the best way to resolve the issue is to use a 1.25 diagonal.

I hope this helps.

[Kevin Ellis]

I think Bob is using a 1 1/4 diagonal.

I have to use the 1.6 OCA with a 1 1/4 diagonal to reach focus with the WO binoviewers in my 90mm Megrez.

If you try this, make sure the 1.6 OCA does not hit the diagonal mirror.

[inspectapart]

Does the use of a diagonal make the in focusing more difficult to achieve? I have found that I can only achieve focus without the diag. This is really awkward in a refractor.

[Kevin Ellis]

Yes

You will need more infocus travel with a 1 1/4" diagonal and even more with a 2" diagonal.

I can only acheive focus with WO binoviewers with no diagonal or a 1 1/4" in my 90mm Megrez.

If you have to use a 2 x barlow, I believe that you will have more than 2 x magnification due to the long light path through the Binviewers to the eyepieces. If the balow is placed before the diagonal the increase in magnification will be even greater.

[WebSentinel]

I wonder if the WO erecting prism would be the better option. I might send an email to WO and ask for their opinion.

[gliderpilot]

I shortened my skywatcher 102 by 90mm to reach focus with binoviewers at one extreme and cyclops mode with the focuser racked out.

Mark