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Inside Questar

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#26 jouster

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Posted 02 December 2012 - 11:24 PM

Can it split doubles?

#27 Larry Geary

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Posted 03 December 2012 - 08:51 PM

The spring inside the baffle tube serves as a series of baffle rings. (On my Questar, the inside of the baffle tube and the spring are blackened, as well as the outside of the end of the baffle tube.) It works very well. Pointing the scope directly at a light bulb and looking through the baffle tube from the back, there are no stray reflections.

#28 Darren Bly

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Posted 03 December 2012 - 09:02 PM

Can it split doubles?


Sure but you only get to see one of them!

#29 GeneT

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Posted 03 December 2012 - 09:29 PM

Cool--really cool! Brought back memories of long ago.

#30 DoctorNoodle

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Posted 04 December 2012 - 07:47 PM

Beautiful!!! Thanks for posting those pics.

#31 blave

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Posted 05 December 2012 - 01:01 AM

Your efforts in taking these pictures are very much appreciated. I received from my parents (at my request) a copy of The Telescope Handbook and Sky Atlas on my 21st birthday -- in 1980. It had that wonderful cutaway view of the Q3.5, and I've wanted one ever since (quite a lot!). So, for my 50th birthday, I bought a 1972 model with 2004 optics for myself... I'll never let it go!

Dave B.
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#32 TG

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Posted 05 December 2012 - 01:26 PM

The spring inside the baffle tube serves as a series of baffle rings. (On my Questar, the inside of the baffle tube and the spring are blackened, as well as the outside of the end of the baffle tube.) It works very well. Pointing the scope directly at a light bulb and looking through the baffle tube from the back, there are no stray reflections.


I would've guessed that the act of cutting in half released the spring from its original position but the truth is even more interesting. The spring is there obviously to eliminate mirror shift but its dual use as a baffle is ingenious. Celestron and Meade could pick up this trick.

Tanveer.

#33 TG

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Posted 05 December 2012 - 01:27 PM

and inside the Brandon eyepiece....


It's a 2-1-2! I thought Brandons were all 2-2.

Thanks for taking the pictures, Darren.

Tanveer.

#34 TG

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Posted 05 December 2012 - 01:28 PM

another view....


I understand the prism diagnonal and the eyepiece above. What's the tube directly opposite the eyepiece for?

Tanveer.

#35 Darren Drake

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Posted 05 December 2012 - 01:34 PM

That tube below the eyepiece is the finder with the lenses built in which is reflecting at 90 degrees from a small mirror below it.

#36 TG

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Posted 05 December 2012 - 01:47 PM

That tube below the eyepiece is the finder with the lenses built which is reflecting at 90 degrees from a small mirror below it.


Makes sense, thanks.

Tanveer.

#37 ColoHank

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Posted 06 December 2012 - 10:55 AM

The spring is there obviously to eliminate mirror shift but its dual use as a baffle is ingenious. Celestron and Meade could pick up this trick.



The small coil-spring inside the baffle tube assembly doesn't exert any force on the mirror and therefore doesn't regulate mirror shift. It serves as a baffle only. The large coil-spring at the rear of the scope does bear against the back of the mirror and helps reduce shift. So also do the carefully fitted spacers (now teflon pads) which are situated to take up any slack between the fixed inner and sliding outer baffle tubes.

#38 Howie Glatter

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Posted 06 December 2012 - 12:16 PM

I'm guessing that Yuri Petrunin of TEC must have seen the ads with the cut-away Questar, because he brought a cut-away version of his own Mac (I think it was a 150mm)to the Winter Star Party about ten years ago.

#39 Darren Drake

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Posted 07 December 2012 - 09:00 PM

I just took a few more pics of the cut up Questar at some interesting angles. I will post them tomorrow. Stay tuned....

#40 yonkrz

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Posted 07 December 2012 - 09:36 PM

Great,will be on the lookout,that thing is awesome.

#41 Darren Drake

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Posted 07 December 2012 - 10:05 PM

One of the shots is sure to raise eyebrows. Again stay tuned....

#42 EJN

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Posted 07 December 2012 - 11:26 PM

How's the star test with that? And who is Mr. Mars?

#43 Darren Drake

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Posted 08 December 2012 - 12:04 AM

The underside...

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#44 Darren Drake

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Posted 08 December 2012 - 12:06 AM

In finder mode with the prism diagonal slid to the side so the finder is producing the view

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#45 Darren Drake

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Posted 08 December 2012 - 12:07 AM

closeup of the coating on meniscus outside..

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#46 Darren Drake

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Posted 08 December 2012 - 12:09 AM

Inside of meniscus also coated!? I didn't realize both sides were coated....

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#47 Darren Drake

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Posted 08 December 2012 - 12:10 AM

The barlow component is in place unlike in the first series..

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#48 Darren Drake

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Posted 08 December 2012 - 12:13 AM

Extra close up of eyepiece...

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#49 Darren Drake

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Posted 08 December 2012 - 12:14 AM

For some reason this one is just extra EXTRA cool! ;)

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#50 Darren Drake

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Posted 08 December 2012 - 12:34 AM

Here the area right behind the mirror can be seen.

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