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Now with Video - First Look: Obsession 15" UC

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#1 Tom T

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Posted 16 July 2008 - 05:26 PM

link

#2 Inkswitch

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Posted 16 July 2008 - 06:22 PM

Tom,
Thanks for the review. It must be nice to use all that equipment you always get. :cool: The link to the video is not working for me. Have a nice day.

#3 Tom T

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Posted 16 July 2008 - 06:37 PM

Hi Lawen,

This was a one night only deal, but it was a heck of a night. :grin:

The video isn't posted yet. It should be up tomorrow. (I hope.)

T

#4 Glen A W

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Posted 17 July 2008 - 12:57 AM

I can't help but think that the telescope looks like the biggest dew-maker I'ved ever seen. Nice scope, though!

#5 Tom T

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Posted 17 July 2008 - 06:56 AM

Agreed, and that's yet another reason for a shroud. In this neck of the woods, they aren't just for glare, they're for dew prevention as well. Frankly, I figured it would dew up pretty quickly but the night was extremely dry.

I'll make a note of that in the article, thanks!

#6 ausastronomer

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Posted 17 July 2008 - 07:04 AM

Hi Tom,

You are as guilty as every other US reviewer, in making an assumption that your review will only be read by people in CONUS.

You note in this review that the 15" UC will be available:-

IN LATE FALL

For the benefit of us underprivileged people who live in Australia and elsewhere, and celebrate the four seasons as Summer, Autumn, Winter and Spring at ridiculous times of the year due to the misfortune of the earth in "wobbling" a lot in its orbit. Would you be good enough to tell me which month you might be talking about :poke:

It's funny but outside CONUS people invariably always refer to the month, rather than the season.

Cheers,

#7 Tom T

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Posted 17 July 2008 - 07:16 AM

Hi John,

As a matter of fact, he actually gave me a specific month but due to the difficulties inherent in bringing a new product to market, I thought it best to change it to the season.

However I will go back add "In late spring" for southern hemisphere folks.


T

#8 Jimbo100

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Posted 17 July 2008 - 07:58 AM

Hey Tom,

I love the big panoptic/ nagler in the primary! :D

Attached Thumbnails

  • 2524021-uc15lead.jpg


#9 Tom T

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Posted 17 July 2008 - 08:02 AM

:lol:

#10 ZachK

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Posted 17 July 2008 - 08:36 AM

Male Free Will: The ability to choose between both options the wife allows.

And even then generally pick the wrong one:)

#11 Peter Argenziano

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Posted 17 July 2008 - 09:39 AM

Agreed, and that's yet another reason for a shroud. In this neck of the woods, they aren't just for glare, they're for dew prevention as well. Frankly, I figured it would dew up pretty quickly but the night was extremely dry.

I'll make a note of that in the article, thanks!


And don't forget FOD (foreign object damage) avoidance.

#12 Peter Argenziano

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Posted 17 July 2008 - 09:41 AM

/snip/
For the benefit of us underprivileged people who live in Australia and elsewhere, and celebrate the four seasons as Summer, Autumn, Winter and Spring at ridiculous times of the year due to the misfortune of the earth in "wobbling" a lot in its orbit. Would you be good enough to tell me which month you might be talking about :poke:


When I posed this question to Dave last week, he told me that a 15-UC ordered then would ship in mid-November.

#13 Tom T

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Posted 17 July 2008 - 01:16 PM

Agreed, and that's yet another reason for a shroud. In this neck of the woods, they aren't just for glare, they're for dew prevention as well. Frankly, I figured it would dew up pretty quickly but the night was extremely dry.

I'll make a note of that in the article, thanks!


And don't forget FOD (foreign object damage) avoidance.


:waytogo:

#14 gatorengineer

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Posted 17 July 2008 - 02:44 PM


Shocked to see a three vane straight spider... It would also appear that circles could not be added to this socpe.... Another surprise.

#15 Tom T

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Posted 17 July 2008 - 03:06 PM

If you mean DSC's - yes, they can be added. They use the same approach the 18" UC does.

#16 Daniel Mounsey

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Posted 17 July 2008 - 09:46 PM

Nice review Tom. I've been drooling over the 18" UC, but I've gotta slow down on the scopes for a change. :lol:

#17 Tom T

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Posted 17 July 2008 - 10:15 PM

I understand completely!

(However, I'm giving serious consideration to one of these in a year or two - funds permitting. Sure would be a nice star party / travel scope.)

#18 Daniel Mounsey

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Posted 17 July 2008 - 10:35 PM

I'm even amazed at how small the 18" looks and the 15" is dynamite. The Youtube video makes it look easy.

#19 Tom T

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Posted 17 July 2008 - 10:41 PM

I hope to get the video up on this shortly, but at this point I don't think it's going to happen till next week.

T

#20 rdrane

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Posted 17 July 2008 - 11:22 PM

link


Does the UC 15 and 18" Obseesion pass the "Barlow collimation test"? In other words, does the red doughnut reflection maintain stability (i.e. no shift or movement)when the scope is moved at various angles and positions?

#21 Tom T

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Posted 18 July 2008 - 07:51 AM

Good question. Didn't have a laser handy to check.

It did appear to maintain collimation in use, but at the focal lengths we were using we weren't being overly critical. (The seeing was too lousy to star test a 115, and the OMI mirrors are a known factor anyway.)

#22 RickR

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Posted 18 July 2008 - 09:56 AM

Tom, how is the Telrad usage on the scope? From the pics seems that it is a bit awkward to be craning your neck over all the time.

#23 Tom T

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Posted 18 July 2008 - 11:00 AM

Given the size of the scope (any scope in this size class) it's actually not bad at all. One of the things that Dave does is mount it on a pole so you can rotate it. This makes the ergonomics quite a bit better and does not affect the alignment.

#24 Tom T

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Posted 18 July 2008 - 11:10 AM

FWIW, for those asking about the video, I've encoded it but blip is apparently not up at the moment, so it won't be posted till early next week.

Thanks for your patience.

#25 Lee Jay

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Posted 18 July 2008 - 12:22 PM

How much difference would there be *visually* (ignore portability and mechanics for the moment) between a 15" UC and, say, a 16" truss dob from Meade or Astro-Tech?


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