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  #1  
Old 16-03-2006, 07:43 AM
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iceman (Mike)
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Review: Orion Sky View Pro 100mm ED EQ Telescope

Gary Syrba (Hammerman) has written a review on the Orion Sky View Pro 100mm ED EQ Telescope.

You can read the review on the IceInSpace Reviews page, or directly by clicking on the link below:

Orion Sky View Pro 100mm ED EQ Telescope

Thanks to Gary for writing the review!

If anyone else would like to contribute a how-to, article, review or other content for the site, please contact me.

Last edited by iceman; 16-03-2006 at 08:12 AM.
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Old 16-03-2006, 08:12 AM
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Article uploaded.
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Old 16-03-2006, 09:02 AM
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Sure to create a bit of discussion (protests even ) saying that the ED100 is sharper and shows more detail on planets than an 8" Dob. You are a bad man Gary! You make me want to go out and get an ED100.
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Old 16-03-2006, 10:08 AM
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[1ponders] (Paul)
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I think I heard Starkler stompin' around here somewhere

hmmmm...hammer, I've been trying to convince that my Orion ED80 is enough for me, but you've got me thinking harder now. Mind you I'd have to get a televue .7X focal reducer to go with it though
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Old 16-03-2006, 10:43 AM
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ving (David)
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look sorry, but a 100mm ota just doesnt have the resolving power of 200mm....

its just not going to happen, execpt in degraded seeing.
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Old 16-03-2006, 10:54 AM
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janoskiss (Steve H)
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Ving, you are contradicting your very recent comment in the Planetary Filter thread.
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Old 16-03-2006, 10:58 AM
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i know

it's all got to do with seeing and air-pocket size steve... airpockets are on average 150mm. the 100mm scope fits withing an airpocket and a 200mm doesnt, hence the seeing needing to be good...

(read this somewhere...)
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Old 16-03-2006, 12:59 PM
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Quote:
Originally Posted by [1ponders]
I think I heard Starkler stompin' around here somewhere


Makes me wonder how well collimated and cooled the 8" newt is.
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Old 16-03-2006, 01:03 PM
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it had to happen
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Old 16-03-2006, 01:13 PM
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Quote:
Originally Posted by [1ponders]
I think I heard Starkler stompin' around here somewhere
What about John B?

An interesting comparison between a smaller apo and a Dob would be with the aperture of the big Newt masked down to match the aperture of the refractor eliminating diffraction from the spider vanes and the central obstruction.
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Old 16-03-2006, 01:15 PM
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Quote:
Originally Posted by ving
i know

it's all got to do with seeing and air-pocket size steve... airpockets are on average 150mm. the 100mm scope fits withing an airpocket and a 200mm doesnt, hence the seeing needing to be good...

(read this somewhere...)
what the hell is this "air-pocket size"
I know that my 8" kills both the ED80 & ZS80 on DSO's
would suspect the same for PRO 100
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Old 16-03-2006, 02:08 PM
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Quote:
Originally Posted by GrampianStars
what the hell is this "air-pocket size"
It has to do with a description of turbulence based on the assumption that the velocity and pressure gradients over distances less than the air pocket size are negligible. In other words, if you were to look at the air within an air-pocket sized region of the atmosphere it would not look turbulent: it would appear to be still or in uniform motion. I personally find this picture questionable, because classical turbulence is by its very nature scale independent (fractal, like my avatar ) until you go right down to the regime of discrete clumps of matter in the forms of atoms and molecules.

IMO a smaller aperture refractor can give the impression of being less affected by seeing because:

- magnifications one uses tend to be less with a refractor because of the shorter focal length of the scope
- limited angular resolution of the refractor does not allow one to resolve the bad seeing in any detail, i.e., the steady diffraction smearing of the image from the small aperture is worse than the unsteady smearing from bad seeing.

But the more I read about other people's experiences, the more I want to grab me a good 4-5" refractor and spend some time seeing how it really works with my own eyes.

I know that the ED80 was no match for my 8" Dob when the latter was properly cooled and collimated. The views did look "sharper" at low magnification in the ED80, but that was just the higher contrast due to no obstructed aperture and the darker background skies due to smaller aperture tricking my brains. When it came to making out fine detail, the Dob always won. But 80mm against 200mm is a very unfair comparison.

Last edited by janoskiss; 16-03-2006 at 06:57 PM.
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Old 16-03-2006, 03:12 PM
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just a shame it's F9.

Bring it in at F6 and I will think about it.
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Old 16-03-2006, 04:20 PM
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Quote:
Originally Posted by janoskiss
Sure to create a bit of discussion (protests even ) saying that the ED100 is sharper and shows more detail on planets than an 8" Dob. You are a bad man Gary! You make me want to go out and get an ED100.
Well, my 8" Starhopper dob outperforms my ED100 (which is still for sale, btw, for other reasons
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Old 16-03-2006, 06:46 PM
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I like the way they sent you a new mount overnight without proof of the fault in the old one. Good Customer Service indeed!
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Old 16-03-2006, 07:54 PM
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Quote:
Originally Posted by cjmarsh81
I like the way they sent you a new mount overnight without proof of the fault in the old one. Good Customer Service indeed!
Note that Hammerman is in the US of A, and for them such service is par for the course.
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  #17  
Old 17-03-2006, 05:08 AM
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All I can say about my review with the 100apo vs 200 reflector issue your discussing is this....

Maybe it's because I live in the suburbs of a large city where light pollution is fairly heavy. Maybe it's because of the difference in contrast with or without the central obstruction. Maybe it's because of the baffles on the 100 help in light polluted areas. Maybe it's because I'm close to 50 and even though I don't need glasses (my Dr. says my eyes are fine), my eyes aren't as good as they were when I was 20. I don't have a good reason why, I just know what my eye sees.

I will say that the 200mm image is much bigger and brighter using the same ep's. For DSO's the larger scope is a big improvement. But when it comes to our solar system I honestly have darker backgrounds and sharper images in the 100mm scope. For the record, after 4 years I know how to properly collimate my dob. I use a cheshire site tool instead of my LaserMate, because the cheshire is a bit more accurate. Cool down times? At least an hour.... usually longer before I use it. Yes, the mirror is good... at least I get concentric circles when I do a star test after collimation. Granted it's not a high quality mirror, it's just one of the Orion Chinese made ones.

Other than that, I don't know what to say except I honestly wrote in my review exactly what I see in the eyepiece of each telescope. Maybe I should have left all reference of the XT8 out of there.

Starkler, customer service in the USA is only par for the course at a very few companies. Orion is one of the few. Sadly most companies are not that good at all anymore.
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  #18  
Old 17-03-2006, 06:14 AM
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Gary don't feel you need to defend yourself - people must remember that reviews are subjective and what one person sees at the eyepiece isn't what another person sees.
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Old 17-03-2006, 08:15 AM
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Yeah Gaza
NObody is baggin' yer mate

wer'e just astro geeks who love to critically scrutinise
all issues
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  #20  
Old 17-03-2006, 12:48 PM
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and gary, like most things in life it comes down to personal preference on which everyone has a differing opinion.
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