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Images of a simple Q4, black, Lab model

Catadioptric Equipment Maksutov Optics Visual Reflector Report Observing Classic Astrophotography
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#1 Oregon-raybender

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Posted 30 November 2022 - 11:20 PM

Here are a few images of a simple Q4. It was brought about 40 years ago for optical company I worked at to test a mirror assembly.

The telescope has a 1/10 wave PV as tested on Zygo ( I don't have the report anymore). The scope was scrapped, since the project

was no longer being produced. I use for nature watching and if I need a quick observing scope to take. It's a f/15  (1,500mm) system.

The views are wonderful and sharp. Since the sun is active again and Mars is close, I plan some imaging, (simple, I am not strong processor)

The optics are still clean, the mirror is fine, the corrector is not coated, not an issue. Not a Questar, but it does the job.

 

Starry Nightswaytogo.gif

 

 

 

Attached Thumbnails

  • Q4  11282022 RD copy.jpg
  • Q4 10 RD copy.jpg
  • Q4 20 RD 11282022 copy.jpg

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#2 pbealo

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Posted 01 December 2022 - 06:46 AM

The GI in S/N means it was made in 1078. Lack of "C" at end of S/N means it is a traditional aluminum coating. I'm surprised at the lack of AR coating. Are you sure?? It would have been simple MgFl.



#3 Oregon-raybender

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Posted 01 December 2022 - 03:46 PM

Made in 1978, that sounds about right. We were using a Questar, but the owner (company board member)

wanted it back, since he wanted to observe with it. I checked the scope again. The mac lens front surface

does not have a AR coating (it failed the color (lack of) and finger oil test, oil from your finger will show up

as "glow" changing the index) The back surface, hard to tell, a slight color appears really soft,

if that. If it does have a AR coating, it's very very thin. You can see it the lights in the lens image does

not have any or much color (it should be lite blue or purple for MgF2)  I would guess they may not have

heated the lens, which was the standard back then, it would have been a risk.

Maybe a cold coat of MgF2 is possible, but would not stick very well after a period of time.

In any case, the scope has fine optics, even if a simple model.

 

Starry Nightswaytogo.gif


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#4 pairofdocs

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Posted 10 December 2022 - 01:45 PM

I have the Questar look-alike Quantum-4 and have found the optics to be outstanding. I rarely get to use the full potential of the scope due lousy local seeing conditions. I had the scope with me in the Marshall Islands during the KWAJEX field experiment and it was the only time I got see it’s full potential. It will be the last scope I give up


Edited by pairofdocs, 10 December 2022 - 01:45 PM.

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#5 Spikey131

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Posted 11 December 2022 - 03:12 PM

I’m still looking for the black lab….snoopy2.gif

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#6 Oregon-raybender

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Posted 16 December 2022 - 06:30 PM

funnypost.gif    Got it.  bow.gif 


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#7 RichA

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Posted 19 December 2022 - 11:48 PM

Here are a few images of a simple Q4. It was brought about 40 years ago for optical company I worked at to test a mirror assembly.

The telescope has a 1/10 wave PV as tested on Zygo ( I don't have the report anymore). The scope was scrapped, since the project

was no longer being produced. I use for nature watching and if I need a quick observing scope to take. It's a f/15  (1,500mm) system.

The views are wonderful and sharp. Since the sun is active again and Mars is close, I plan some imaging, (simple, I am not strong processor)

The optics are still clean, the mirror is fine, the corrector is not coated, not an issue. Not a Questar, but it does the job.

 

Starry Nightswaytogo.gif

Interesting, it does remind me of the Quantum 100.



#8 telescope200

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Posted 21 December 2022 - 07:37 PM

Interesting, it does remind me of the Quantum 100.

It is a Quantum 100. If dates are being read right this is #45 built in 1979 (based on this being #4 built in 1978). They probably used the same parts to build custom scopes, they wouldn't have had much leeway to machine all new stuff.


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