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Orion Express 80mm Semi apo for astrophotography

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10 replies to this topic

#1 BillBrowning

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Posted 21 September 2005 - 10:41 PM

Anyone use this scope with there DSLR? I wanted somthing that wont give as much blue fringe around the brighter stars like im getting with my regular telephoto lens and just can't afford an Apo right now so Semi Apo seems the way to go( you can take a look at my pics i posted and see the fringe Im talking about)

#2 Rat8bug

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Posted 22 September 2005 - 02:02 AM

I think you will not see any improvement with this telescope. It is apparently very similar to the William Optic telescope, which has noticable fringing around brighter object. In fact, it has more color than my Vixen short tube A80SS. What I do with the Vixen is use software (Paint Shop Pro 9 or 10 ) to eliminate the fringing on brighter stars. These programs have a CA filter that is designed specifically for this task; works great IMO. You can read about the Vixen here:

http://www.barrie-ta.../vixen80ss.html

Ciao...Barry

#3 dimitrir

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Posted 22 September 2005 - 02:12 AM

If you can afford Orion Express - why not get an Orion ED80 apochromat instead? They are plentiful on astromart, and sometimes they are on sale on Orion site.

#4 gettr

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Posted 22 September 2005 - 12:20 PM

I have the ZS80. There is some CA with this scope. Not horrible, but it's there. If it's an issue, the Orion ED80 would probably be your best bet....and it's in the same ballpark money wise (about 100 more I think)

Hope this helps,
Dennis

#5 southmike

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Posted 22 September 2005 - 01:10 PM

I wonder how much of a price diff there is between a new zs80 and an orion 80ed used or off the seconds list.

#6 dimitrir

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Posted 22 September 2005 - 03:08 PM

I wonder how much of a price diff there is between a new zs80 and an orion 80ed used or off the seconds list.


Probably none.

Is Orion Express the same scope as ZenithStar William Optics used to cheat with by stepping it down to ~70mm or so ?

#7 southmike

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Posted 22 September 2005 - 03:31 PM

it looks similar but i think they are two different animals..

are you going to masp dimitrir?

#8 williamoptics

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Posted 22 September 2005 - 10:40 PM

Hi Dimitri,

what do you mean by "cheat"? It was not intentional, and when we noticed, we fixed at our cost all the few scopes we had sold before we solved the issue. Those customers also got a discount coupon together with the new baffle, for your information. Let me know whether other companies did the same yet or recognized their mistake. We did.

Please let's be careful with wording, because "verba volant, scripta manent" and nobody gains from vendor bashing.
We are here to improve, not to quarrel, right?

Daniel

#9 dimitrir

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Posted 22 September 2005 - 11:28 PM

Sorry, Daniel. I probably meant another William Optics scope - I didn't even know it happened again. I saw this posting when I was looking for William Optics reviews (when I was thinking about buying one): http://groups.google...afe1a506c1fcd3c - note the date: Jan 29 2001

...
I don't suppose there is anything
really wrong with such a method of baffling except the foam rings nearest
the objective appear to intrude into the light path and effectively reduce
the true objective size to something on the order of 70mm rather than 80mm.
This is the same on both scopes. I say
this because it has been my understanding that one should be able to look
through the objective, holding the scope at a slight angle so that you're
looking at the outer most edge of the objective, and
be able to see an unobstructed path at least to the center of the eyepiece,
but preferably to the outer most opposite edge of it. Looking through the
Megrez 80 objective in that fashion there can
clearly be seen foam rings blocking the light path. Out of curiosity I
removed the glued together foam rings (they slide out the front of the scope
as a unit after removing the objective cell) then turned the scope back on
Jupiter (I did this with the first scope received on a night of fairly good
seeing). The view was definitely brighter and a bit more secondary color
could be seen on the limb. As far as I know, that would be consistent with
a stopped down refractor objective after removing the stop i.e., greater
aperture and faster focal ratio.
...



#10 southmike

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Posted 23 September 2005 - 03:00 AM

masp.org i meant

#11 dimitrir

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Posted 23 September 2005 - 12:22 PM

masp.org i meant


I hope to - it's only ~60 miles or so from Cary.


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