Getting a ZS 80 II ED APO to focus

[p1taylor]

Hi All,

What I need to know is the distance required from out side face of 2" eyepiece holder to achieve focus, scope is a just acquired ZS80 II ED ARO, tried it last night with a Meade 2" diagonal in and can focus OK with eyepiece but not with SX
Lodestar or SX H9C which I will be using with it, do I need more distance or not.

peter

[dannat (Daniel)]

Peter, does it have a visual back? Or sct thread. My 66 had a sct thread & if I remember needed a 35mm ext tube to reach focus

[bokglob (Darrell)]

Yep, you need an ext tube

[Brundah1 (David)]

Something like this if your camera connects to T thread:

http://www.williamoptics.com/wo_shop...products_id=79

Or if you use a nosepiece:

http://www.williamoptics.com/wo_shop...products_id=80

I chose these for my WO M72 and WO M80 II EDT APO.
Close tollerance fit and great finish.

[p1taylor]

Hi Daniel, Darrell,

I take it by visual back you mean eyepiece holder, is what I have not a sct? thread, one day will get use to right terminology, so do I put an extra 35mm in to diagonal which will be an extra 95mm as diagonal is 60mm, just for interest this is setup so far minas diagonal, I want cameras street thru

peter

[dannat (Daniel)]

Sorry peter I was talking straight thru, minus the diagonal..the diagonal might be moving you out too far, I never tried focusing with diagonal in place..only strait thru

[p1taylor]

David I had seen those do I just need one of them, both cameras can be T2 or slide in.

Daniel seems strange to me that cameras need to be nearer than eyepieces but will try it.

peter

[p1taylor]

I managed to get it to focus it needed 95.5mm of spacers in to get focus in daylight at 300M is all I can do.
peter

[dannat (Daniel)]

9cm seems like a long way, far out out do the ep's focus

[p1taylor]

Hi Daniel,

I can focus eyepieces but have to use a meade 2" diagonal in which is 111mm, canot get focus with out, it seemes a long way to me.

peter