Re: [William-Optics] Zenithstar ED or FD for wide field astronomy?
- Hi Steve,
Thanks for your input. Every opinion is welcome, pro or con. I use the
Zenithstar 66 SD and color is not a problem at low, medium
magnifications. It does show some red color at high powers, and thus
makes splitting close doubles more difficult. I suspect the 80mm version
would perform similar as the they both use the same type of glass. Good
for deep-sky, not so good for lunar/planetary or close doubles.
However, what worries me more than color is the masking issue. If I
intend to purchase an 80mm scope then I wouldn't want a 70mm instead.
Not even a 75mm. So, if the EDII is really masked down, I might want to
buy the FD instead.
> Hi Zsolt,
> I owned the WO ZS II ED, returned it, and replaced it with the FD. I'm
> the person who's not satisfied with the II ED's color correction and by
> my calculations it was masked down to a 70mm scope. WO claims that it
> was masked by only 2mm. I'll post a photo, if it's allowed, and you can
> decide for yourself.
> On the positive side, I'm very happy with the color correction of the FD
> and there's no masking.
> I suspect if use it on DSOs, you won't have a problem with CA in the II ED.
- Hi Don,
Thank you! Yes, I am sure the FD is very good scope. If I had the money,
I'd go for it without hesitation. I still don't know how much it costs
in Hungary, but a friend of mine (he runs an astro business) will find
out soon. I don't plan to engage in any kind of photography with it.
Don Klabunde wrote:
> I've had my Z80FD for a year and half and wouldn't part with it. The
> views are tack sharp, color free visually, and you can also take
> great photos with it.
> One thing to consider is if you might want to use this as a spotting
> scope or telephoto lens someday. If so, then color correction makes
> a BIG difference, especially in bright sun light.
> The FD with it's better color correction is a much better way to go
> if you want a multi-use scope like I did.
- I just so this focuser on the William Optics website. It can be fitted
to Synta-type refractors, in place of the stock focuser. Neat.
Has any of you ever tried it? Can it be fitted to the Celestron or
Skywatcher 80ED scopes?
- Hi Scott,
As far as I can see both scopes have the same baffle, so I don't know
what caused the masking. Consequently, I would check any ZS scope for
masking, some may have it and some may not. Cutting the baffle is not
an option unless the scope is out of warrenty, since cutting would
void the warrenty as per WO.
--- In William-Optics@yahoogroups.com, "Scott Walker" <sdwalker@...>
>about twice as good as the ED. The numbers given for the ED are
> Per the numbers given on the WO websight the FD color correction is
aboat twices as good as a standard achromat. It looks like Steve
could see this difference between the two which is not surprising.
As for the masking of the IIED I would like to see the numbers. I
would think they use the same baffles as the FD. I know the last
baffle looks like it just lets the full 80mm through on the FD. What
is causing the masking on the 80IIED?
> Scott Walker
> ----- Original Message -----
> From: scouture@...
> To: William-Optics@yahoogroups.com
> Sent: Monday, April 30, 2007 6:16 PM
> Subject: Re: [William-Optics] Zenithstar ED or FD for wide field
>FD. I'm the person who's not satisfied with the II ED's color
> Hi Zsolt,
> I owned the WO ZS II ED, returned it, and replaced it with the
correction and by my calculations it was masked down to a 70mm scope.
WO claims that it was masked by only 2mm. I'll post a photo, if it's
allowed, and you can decide for yourself.
>the FD and there's no masking.
> On the positive side, I'm very happy with the color correction of
>the II ED.
> I suspect if use it on DSOs, you won't have a problem with CA in
> On Mon Apr 30 9:46 , 'szalma_zsolt' <zsolo@...> sent:
> Hi guys! My name is Zsolt Szalma, just joined this group. I
> Hungary and currently own a William Optics Zenithstar 66SDtelescope.
> It's a really beauty and gives excellent, clear images at lowand mid
> powers. However good it is, it's stillonly a 66mm scope. SoI've ben
> thinking about upgrading it to an 80mm William Optics scope.110mm
> would be even better, but way out of my budget. So it must bean 80mm
> telescope. I would use it for at low and mid powers for widefield
> deep-sky astronomy. Once in a while I'd look at the Moon or aplanet,
> but this wouldn't be its main use.discussion.
> Let's see the options.
> The Megrez triplet is too expensive for me, so it's out of
> That leaves me with two Zenithstars to choose from. One is theED II,
> the other is the FD. Reviews favor the FD for its better colorED is
> correction. However the FD is really streching my budget. The
> more affordable (at least here in Hungary). Here I need yourhelp in
> my decision. Those of you who looked through both, what do youthink
> of them? Is false color significantly worse in the ED? Or wouldit be
> perfectly suitable for the intended use? If the FD is that muchmoney on
> better, I'm ready to buy it, but I don't want to spend extra
> something that would not be that much improved for deep-skywork.
> Every suggestion, tip or review is appreciated!!
> Thanks a lot in advance!
> Zsolt Szalma
> P.S. I read in other forum that the Zenithstar 80 FD is stepped
> to 75mm really, because of the baffles. Any truth in thatstatement?