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thoughts on the 12.5 Obsession

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#1 derekdann30

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Posted 26 February 2013 - 10:27 AM

Hi there. I've been into visual astronomy now for almost twenty yrs. I currently have an Orion XT8 which I think is a fine scope. I was originally thinking about having a small grab n go refractor to compliment my dob. I just recently decided to go the other way in aperture and is considering the 12.5 inch Obsession. I've always been fascinated with the truss tube designs. Would the image quality and brightness be a big jump from an 8 inch? How would this compare to the truss scopes from Orion and Meade? Thnx

#2 Astrojensen

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Posted 26 February 2013 - 10:45 AM

Going from 8" to 12" is a tremendous jump! Did it myself, going from a C8 to a 12" Meade Lightbridge. The performance increase is VERY noticeable.

The Obsession is of a much higher quality overall than the Orion or Meade scopes. Though I really like my 12" Lightbridge, it must be noted that I have had to fix some issues and upgrade it here and there.


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#3 CosmoSat

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Posted 26 February 2013 - 11:28 AM

This video might be of some help in deciding and compare with ur current scope... Am not saying anything about optics, but the structure u will definitely like.
http://www.youtube.c...=obsession 12.5

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#4 coutleef

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Posted 26 February 2013 - 11:34 AM

i made that jump and it is very noticeable. as for the obsession the biggest difference will be in the quality of mirror and smotthness of movement

#5 derekdann30

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Posted 26 February 2013 - 01:57 PM

Thank you folks. I've also been debating for about half the price, an Orion XX14i truss dob. Visually how would it compare with the 12.5 Obsession? Some of my favorite objects to observe are the planets. Would I be able to pick out minute detail and crisp structures on Jupiter with the 14 when well collimated?

#6 Achernar

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Posted 26 February 2013 - 07:38 PM

Going to a 12.5-inch from an 8-inch will result in a massive difference in what you can see. Many objects that are invisible through an 8-inch will appear through a 12-inch, and most of what you can see through your 8-inch will be noticeably easier to see, and show more detail through a 12-inch. Best of all, you get big aperture performance in a telescope that will fit into any car.

Taras

#7 The Ardent

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Posted 26 February 2013 - 08:07 PM

I just sent you an email.

Would I be able to pick out minute detail and crisp structures on Jupiter with the 14 when well collimated?



#8 GeneT

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Posted 26 February 2013 - 08:23 PM

Thank you folks. I've also been debating for about half the price, an Orion XX14i truss dob. Visually how would it compare with the 12.5 Obsession? Some of my favorite objects to observe are the planets. Would I be able to pick out minute detail and crisp structures on Jupiter with the 14 when well collimated?


Given the choice between a 12 inch Obsession and a 14 inch Orion, I would go with the Obsession. The Obsession will be easier to haul, set up, and take down. A lot of people like the Orions, and I am not putting them down. The best thing to do would be to go to a star party and try them both.

#9 Mike B

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Posted 27 February 2013 - 03:35 PM

I would go with the Obsession.



I think i'd agree with that myself. Even tho it's certainly not a toss-up for price! The ObDob is still waay more... but for *performance*, optical *AND* mechanical, the modest diff in aperture wouldn't be enough to tip my scales toward the larger.

Yet it might be arguable that the 14i's mirror could even be refigured, and other doodads refined, to where the mechanical diff's might not be quite as significant- and this could probably be done for LESS than the cost of the ObDob new... :shrug:

But i still recall using a 12.5" Obsession for a few minutes... the views were impeccable! And the movements were like soft butter... and the weight of the components was like feathers. The Orion Dob is a beast by comparison! This aspect would weight (pun intended) heavily in *my* choice... but perhaps not everyone's.
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#10 CarlDD

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Posted 27 February 2013 - 04:16 PM

I own an early production 12.5 Obsession and yes it's a fine scope, but, not perfect outof the box. Be prepared to work on the secondary holder ( I changed to an astrosystems 4 screw design ), the sling ( I swapped to a Howie Glater wire sling) and sorry to say - I had to get my mirror recoated as the coating started to flake off after 6 to 7 years. Movement is smooth, Argo Navis was easy to install and makes finding stuff simple. The optional Light Shroud is essential, if you choose a telerad, get the 4 inch riser. The standard JMI focuser works fine and is probably improved and even better now.
The woodwork is very good on the outside, varnish is fine after nine or ten years. The scope is so good now I cant imagine being without it.
Best Regards
Carl

#11 gaz-in

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Posted 28 February 2013 - 07:39 AM

IMHO....also look at Teeter Telescopes...mine was near perfect out of the box...

#12 GeneT

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Posted 28 February 2013 - 12:50 PM

Going to a 12.5-inch from an 8-inch will result in a massive difference in what you can see.


Totally true--a 12 incher gathers twice the light of an 8.

#13 derekdann30

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Posted 28 February 2013 - 02:57 PM

Thanks for all the wonderful replies, folks. I really am looking forward to the making the jump from an 8inch to a 12 inch.

#14 Markovich

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Posted 28 February 2013 - 07:41 PM

Ive seen a few newer 12.5" Obsessions, beautful scope.

#15 Thomas Karpf

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Posted 01 March 2013 - 07:29 AM

If you're buying that NEW, you definitely want to look at the Starstructure 12.5" with a Carl Zambuto mirror. Currently $3495. WELL worth the additional $200 above the price of the Obsession.

http://www.starstruc...ucture3_007.htm

#16 MDavid

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Posted 01 March 2013 - 09:33 AM

GeneT,

Speaking of new scopes...How much did you pay for the 12.5 Porta Ball? I've reached out Mag 1 but haven't heard back from them...Thanks!

#17 Thomas Karpf

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Posted 01 March 2013 - 09:40 AM

The price on the 12.5" Portaball last year was $5,195. I have no idea what the current price might be.

#18 MDavid

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Posted 01 March 2013 - 12:04 PM

The price on the 12.5" Portaball last year was $5,195....


ouch, I think I may need Ocean's assistance... :smirk:

Thanks!

#19 Starman1

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Posted 01 March 2013 - 03:00 PM

That Starstructure is the bargain of the bunch. And nicer than the Obsession in many ways, which I won't go into here. I would, however, request it with a 2.6" secondary mirror, not a 2.14" if you plan to use low-power, widefield eyepieces like the 31 Nagler. If your interest is primarily planetary nebulae, planets, and Moon and double stars, or you only plan to use 1.25" eyepieces, the supplied secondary is OK.

12.7" is 2.512X the light grasp of an 8" (exactly one magnitude deeper reach), so the 12.5" is very close to gaining a magnitude on the 8". This doubles and more the number of DSOs visible because there is a much larger portion of universe seen. I've estimated the maximum number of objects visible to the experienced observer in pristine skies at ~15000 for an 8" and ~32000+ for a 12.5".

A 12.5" truss scope breaks down into sections that are easy to transport and move (in fact, my 8" LX200 was heavier overall) and will still yield a nice large low power field.

#20 dscarpa

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Posted 01 March 2013 - 03:35 PM

The problem with the 12.5" Starstructure is it's no longer made. I checked it out while on my newt quest. David

#21 johnnyha

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Posted 01 March 2013 - 03:44 PM

If I was buying a dob today i would definitely buy a used custom mirror scope, there are so many great bargains out there and many are scopes that simply have been hardly used by the owner. It is a true buyers' market.

#22 Starman1

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Posted 01 March 2013 - 04:49 PM

The problem with the 12.5" Starstructure is it's no longer made. I checked it out while on my newt quest. David

http://www.starstruc...ucture3_007.htm

#23 dscarpa

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Posted 01 March 2013 - 05:00 PM

I saw that ad and called called Starstructure. I was told that they didn't make it any more. David

#24 jboege

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Posted 01 March 2013 - 07:20 PM

I also was told the same months ago.

I saw that ad and called and called Starstructure. I was told that they didn't make it any more. David



#25 Joe Bergeron

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Posted 05 March 2013 - 11:30 PM

The problem with the 12.5" Starstructure is it's no longer made. I checked it out while on my newt quest. David

http://www.starstruc...ucture3_007.htm


They no longer make the scope, but they leave the page up on their site? Sloppy.






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