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Is the Unitron Unihex a good turret?

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#1 Eric P

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Posted 08 March 2021 - 09:57 AM

How are they optically?  Does the compression style holder work well?



#2 petert913

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Posted 08 March 2021 - 10:06 AM

Mechanically, they are a lot better than those plastic models on the market today. I would put it in a click lock if one were available.


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#3 starman876

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Posted 08 March 2021 - 02:06 PM

only has one prism so not much light loss. need adapters to use 1.25:" eyepieces available at the Astronomy Shoppe


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#4 Terra Nova

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Posted 08 March 2021 - 02:12 PM

The compression holders work quite well with the relatively light Unitron eyepieces, which are parfocal in the Unihex due to the different barrel lengths which accommodate the 25mm, 18mm, 12mm, 9mm, and 7mm very well. Optically, as long as the prism is clean and properly aligned, I think it works as well as a good prismatic star diagonal. 


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#5 starman876

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Posted 08 March 2021 - 04:04 PM

The compression holders work quite well with the relatively light Unitron eyepieces, which are parfocal in the Unihex due to the different barrel lengths which accommodate the 25mm, 18mm, 12mm, 9mm, and 7mm very well. Optically, as long as the prism is clean and properly aligned, I think it works as well as a good prismatic star diagonal. 

it is acutally a plain star diagonal in which you can select which eyepiece is using the star diagonal.


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#6 Bonco2

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Posted 08 March 2021 - 04:46 PM

I'm very satisfied with the optical and mechanical quality of the standard Unihex. Having one tube dedicated to 1.25 allows for using a variety of more modern eyepieces that are better for wide field views.. However I find the .965 Unitron eyepieces to be just fine for planetary, lunar and double star use. Overall its an attractive and useful product.

Bill


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#7 starman876

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Posted 08 March 2021 - 05:32 PM

I'm very satisfied with the optical and mechanical quality of the standard Unihex. Having one tube dedicated to 1.25 allows for using a variety of more modern eyepieces that are better for wide field views.. However I find the .965 Unitron eyepieces to be just fine for planetary, lunar and double star use. Overall its an attractive and useful product.

Bill

A lot of people snub .965 eyepieces.   Surely shows they have never tried them in a good scope.


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#8 Terra Nova

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Posted 08 March 2021 - 07:14 PM

The Unitron 0.965” eyepieces are quite good in my opinion. When all the other Japanese makers were for the most part doing Ramsdens and Huygenian variants all the way down the line, Unitron was using Kellners, Symmetricals (Plossls?), and orthos.


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#9 pdxmoon

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Posted 09 March 2021 - 11:46 AM

The Unitron 0.965” eyepieces are quite good in my opinion. When all the other Japanese makers were for the most part doing Ramsdens and Huygenian variants all the way down the line, Unitron was using Kellners, Symmetricals (Plossls?), and orthos.

Off your advice, Terra, when I purchased my first Unitron I tried the Uni eps. I love them! They are perfectly fine for lunar observing. I do now own a Unihex, new to me, so I'm really looking forward to giving it a run.


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#10 DAVIDG

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Posted 09 March 2021 - 12:48 PM

 I have a couple of Unihex that are NOS and so never used. I like them but I found two issues. One is that  the tubes that hold the eyepieces can be screwed in off alignment. It is not by much but something to check and can be fairly easily corrected by being careful as you start to thread them into the base. The other issue is that the detent  for each position can also be off causing the alignment of the eyepiece to be slightly off from  the optical axis. Both of these errors will show up with uneven illumination of the field of view along the edges of the field. The good new is that when used with F12 to f/15 refractor the problems don't introduce major errors in the image. On the one have on my  60mm Unitron model 114 which I really like the  whole setup,  I have fixed the eyepiece tube alignment and I just wiggle the rotation of the turret a bit to get the field evenly illuminated. 

 

               - Dave 


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#11 BMW YMIR

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Posted 10 March 2021 - 02:46 PM

Hi everyone, I use mine way more than I thought I would. I have no issues with it and find the image to be bright and crisp. I use the1 1/4 most. Hope all is well with everyone and be safe.
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#12 starman876

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Posted 10 March 2021 - 04:11 PM

 I have a couple of Unihex that are NOS and so never used. I like them but I found two issues. One is that  the tubes that hold the eyepieces can be screwed in off alignment. It is not by much but something to check and can be fairly easily corrected by being careful as you start to thread them into the base. The other issue is that the detent  for each position can also be off causing the alignment of the eyepiece to be slightly off from  the optical axis. Both of these errors will show up with uneven illumination of the field of view along the edges of the field. The good new is that when used with F12 to f/15 refractor the problems don't introduce major errors in the image. On the one have on my  60mm Unitron model 114 which I really like the  whole setup,  I have fixed the eyepiece tube alignment and I just wiggle the rotation of the turret a bit to get the field evenly illuminated. 

 

               - Dave 

But you have used them so they were NOSflowerred.gif



#13 DAVIDG

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Posted 10 March 2021 - 04:30 PM

But you have used them so they were NOSflowerred.gif

 Very  true.  smile.gif   Just trying to point out that the issues I saw were not the cause of some past owner.

 

                        - Dave 



#14 starman876

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Posted 10 March 2021 - 04:32 PM

 Very  true.  smile.gif   Just trying to point out that the issues I saw were not the cause of some past owner.

 

                        - Dave 

I have never looked for the issues you found, but I will now.  It is amazing how these NOS parts keep popping up.  They are sure wonderful finds.



#15 DAVIDG

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Posted 10 March 2021 - 04:37 PM

I have never looked for the issues you found, but I will now.  It is amazing how these NOS parts keep popping up.  They are sure wonderful finds.

 I would add I would check the alignment of the prism. When I used a laser I found them to be off as well and bit of shimming fixed the problem. These small error won't show up when your using them a 60mm f/15 refractor but if you used them with more aperture and/or a faster light cone they would affect the image quality.

 

                - Dave 


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#16 starman876

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Posted 10 March 2021 - 05:47 PM

 I would add I would check the alignment of the prism. When I used a laser I found them to be off as well and bit of shimming fixed the problem. These small error won't show up when your using them a 60mm f/15 refractor but if you used them with more aperture and/or a faster light cone they would affect the image quality.

 

                - Dave 

alway good information.  Thanks Dave


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#17 rcwolpert

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Posted 10 March 2021 - 06:06 PM

I might be in the minority, but I really didn’t like the Unihex and seldom used it. I never had the need to add the weight of the Unihex and 5 or 6 eyepieces to the tail end of a small refractor. Plus, I was never really sure if the detects were perfectly seated. I was also haunted by the possibility of the Unihex slipping out of the focusing tube. But otherwise, I love it! grin.gif


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#18 CHASLX200

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Posted 10 March 2021 - 07:12 PM

Mine was fine on my 1960 M-152. I just had no use for .965 OD eyepieces.



#19 starman876

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Posted 10 March 2021 - 07:17 PM

Mine was fine on my 1960 M-152. I just had no use for .965 OD eyepieces.

A shame, because there are some really fine .965 eyepieces.


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#20 CHASLX200

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Posted 10 March 2021 - 08:11 PM

I just don't like nose bleed ER and straw like FOV's. The Meade SWA's and UWA's in the later 80's spoiled me for life.   Give me a Radian or Delite any day.



#21 starman876

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Posted 10 March 2021 - 08:16 PM

I just don't like nose bleed ER and straw like FOV's. The Meade SWA's and UWA's in the later 80's spoiled me for life.   Give me a Radian or Delite any day.

I  understand the wide field eyepieces, however there are some really nice .965 orthos that are excellent on planets where you really do not need a wide view.


Edited by starman876, 10 March 2021 - 08:16 PM.

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#22 CHASLX200

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Posted 10 March 2021 - 08:22 PM

Wider views help with moving a Dob at over 800x by hand.



#23 starman876

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Posted 10 March 2021 - 08:27 PM

Wider views help with moving a Dob at over 800x by hand.

that has to be very tricky.   At times like that I am so happy for a mount with a drive.



#24 luxo II

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Posted 10 March 2021 - 08:41 PM

Wider views help with moving a Dob at over 800x by hand.

Off topic - a Unihex is definitely for old refractors only, and no-one puts a turret on a dob.


Edited by luxo II, 10 March 2021 - 08:44 PM.


#25 jgraham

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Posted 10 March 2021 - 09:45 PM

+1

 

I became a real fan of 0.965” eyepieces once I pieced together a nice set of quality oculars. I like them much better than kludging 1.25” eyepieces onto a 0.965” focuser. I also have a Unihex that is of excellent build quality, but it seems to be one of the older models that is a bit tough to adapt to a 1.25” draw tube. I pieced together a Terra Nova adapter, but the threads didn’t match those on my Unihex. :(

 

I’ll figure something out. 


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