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Best Accessories from Questar?

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14 replies to this topic

#1 cavecollector

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Posted 28 May 2024 - 09:14 PM

Which are your favorite, most used accessories as sold by Questar? 



#2 Tbsweet

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Posted 29 May 2024 - 03:20 PM

For me it’s the full solar filter.


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#3 Absorber

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Posted 29 May 2024 - 10:04 PM

The Tri-Stand short pier setup


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#4 cavecollector

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Posted 29 May 2024 - 10:16 PM

Do they still sell the Tri-Stand? I thought they stopped producing them when the company that made them stopped building them for Questar?



#5 RMay

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Posted 29 May 2024 - 10:24 PM

Do they still sell the Tri-Stand? I thought they stopped producing them when the company that made them stopped building them for Questar?



While perhaps not officially discontinued, the Tristand has not been produced in a few years now. When I inquired to ask if they might at least ‘open source’ the production specs so others could build them, my request was politely declined.

Ron
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#6 cavecollector

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Posted 29 May 2024 - 11:54 PM

Fortunately,  there are some amazing photo/video/surveying tripods out there. The Tri-Stand was an inspired design though, I really hope someone will make something similar (or for Questar to sell them again). If designed right, they could used with many other small catadioptric telescopes with fork mounts. A C5 could work great on one. Lots of possibilities in case you're a machinist or manufacturing company. Anyone looking to start a small business making things? 



#7 RMay

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Posted 30 May 2024 - 12:55 AM

Fortunately, there are some amazing photo/video/surveying tripods out there. The Tri-Stand was an inspired design though, I really hope someone will make something similar (or for Questar to sell them again). If designed right, they could used with many other small catadioptric telescopes with fork mounts. A C5 could work great on one. Lots of possibilities in case you're a machinist or manufacturing company. Anyone looking to start a small business making things?


It would be interesting to bring a Tristand into a CNC metal fabrication shop, ask them to reverse engineer it and then get a quote for, say, 20 copies…

Ron
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#8 emh52

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Posted 30 May 2024 - 11:13 AM

Do they still sell the Tri-Stand? I thought they stopped producing them when the company that made them stopped building them for Questar?

I have one, it is a great design, inspired I think, but it is heavy, really heavy, I like it, but for me it is backyard use, not travel that I sort of foolishly thought when I bought it. You can accomplish the same goal with a carbon fiber tripod and a gear head to adjust for latitude easily in a much lighter and compact package for travel. It is a kind of inspired stable design from a bygone era before the lighter stuff today. I do like it has a built-in handle- it needs it. Aside from any patent/copyright issues I imagine it could be replicated if there was a big enough run..... maybe even make it lighter with different fabrication like anodized Al instead of iron, or even partially carbon fiber.


Edited by emh52, 30 May 2024 - 11:22 AM.

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#9 pbealo

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Posted 30 May 2024 - 11:29 AM

It would be interesting to bring a Tristand into a CNC metal fabrication shop, ask them to reverse engineer it and then get a quote for, say, 20 copies…

Ron

My son fully captured the design in CAD and we went out to bid on having parts made in China. It was not cost effective for low volumes (<100).

 

Peter B.


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#10 DAVIDG

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Posted 30 May 2024 - 11:57 AM

 My favorite accessory is the TeleVue 1.25" eyepiece adapter that I modified slightly by machining down the top surface so the finder and the scope will both be in focus.

 

                     - Dave 


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#11 Optics Patent

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Posted 01 June 2024 - 03:11 PM

It would be interesting to bring a Tristand into a CNC metal fabrication shop, ask them to reverse engineer it and then get a quote for, say, 20 copies…

Ron


The same could be said for the entire Questar telescope (mechanical), and this probably should have been done decades ago.

#12 Optics Patent

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Posted 01 June 2024 - 03:11 PM

My favorite accessory is the TeleVue 1.25" eyepiece adapter that I modified slightly by machining down the top surface so the finder and the scope will both be in focus.

- Dave


That should be commercialized!

#13 markmanner

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Posted 01 June 2024 - 05:59 PM

...

So, my question to all of you with Broadband Questars, what are you doing? ......

I plan on dying when the transmission drops by more than 20%.


Edited by markmanner, 01 June 2024 - 06:45 PM.

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#14 Paul Schroeder

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Posted 01 June 2024 - 06:37 PM

One thing not mentioned so far are the optical coatings. The Standard coatings last for many decades while the Broadband coatings group starts to drop in performance after about a decade. While they will continue to function for quite a while, the images will continue to dim as the coatings slowly age and fail. You can't just have the Broadband coatings replaced through the typical recoating process like with the Standard. Broadband coatings must be polished off, a very time consuming, laborious process and it's cheaper and faster to just replace the optics.

 

So, my question to all of you with Broadband Questars, what are you doing? Buying spare optical sets and sending Tony life extension products so he will be around to replace the optics? What are you doing to protect your investment?

 

Just out of curiosity, has anyone thought to call Cumberland to see how they're doing and find out if there are any situations in which they would consider making and selling optical sets for Questar owners who can't get them any other way?

Is there any objective way to measure how much performance degradation occurs with older broadband coatings?  I have a 1971 Questar with broadband coatings; upon visual inspection there are no obvious issues, and images don't appear inordinately dim.

 

That being said, I don't have a late model Questar handy to serve as a point of reference.  

 

It would be interesting to hear if anyone's actually measured light throughput on an older instrument like this, and then compared it to the throughput on a newer unit.

 

Many thanks,

 

Paul


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#15 98105dude

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Posted 01 June 2024 - 11:02 PM

Perhaps Cumberland has a way of knowing WHO'S calling before they pick up. Signed - proud member of the Grubby Public 




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