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Unitron EQ mount question

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18 replies to this topic

#1 Nippon

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Posted 22 May 2019 - 06:16 PM

I don't own a Unitron refractor or mount but back in the day I sure wanted one. Anyway from photos I've seen of the Unitron equatorial mounts it appears they all came with slow motion controls on the RA and DEC. And I've seen photos of them with an RA clock drive and even weight driven RA drives. So my question for those of you who use your Unitrons for regular observing do you prefer just using the slow motions or do you prefer to equip them with an RA drive?



#2 CHASLX200

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Posted 22 May 2019 - 06:31 PM

I don't own a Unitron refractor or mount but back in the day I sure wanted one. Anyway from photos I've seen of the Unitron equatorial mounts it appears they all came with slow motion controls on the RA and DEC. And I've seen photos of them with an RA clock drive and even weight driven RA drives. So my question for those of you who use your Unitrons for regular observing do you prefer just using the slow motions or do you prefer to equip them with an RA drive?

I was always happy with SLO- MO controls. I never even bother to plug in a drive if i have one anyways.


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#3 Garyth64

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Posted 22 May 2019 - 06:33 PM

For regular observing, I have done both.  I liked using the slow mo controls when I didn't have a CD on the mount.  After I made a CD, I like using it even more.  It's really great to be able to make little adjustments, if needed, to keep things in the fov.


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#4 Russell Smith

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Posted 22 May 2019 - 06:42 PM

Funny you should ask.
I'm waiting for dark and hoping that I can use my new to me 128 tonight.
At this point i don't feel a drive would make this any better.

#5 Russell Smith

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Posted 22 May 2019 - 06:45 PM

Thanks Dave.

Attached Thumbnails

  • 128rps20190522_184433.jpg

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#6 Nippon

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Posted 22 May 2019 - 06:59 PM

Thanks Dave.

Very Pretty. Is the 128 a 60mm or 3"?



#7 Russell Smith

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Posted 22 May 2019 - 07:00 PM

62x900



#8 Nippon

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Posted 22 May 2019 - 07:05 PM

Back in the 60s I had a Tasco 60x700. I had no idea what an airy disc was but years later when I found out I remembered that the airy disc in my old Tasco was text book.


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#9 Russell Smith

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Posted 22 May 2019 - 08:08 PM

Today was the first day I have personally seen or been able to touch any unitron.

#10 ngc7319_20

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Posted 22 May 2019 - 08:47 PM

Oh, weight driven is the only way to go...  Watching the brass governor is a joy in itself...


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#11 Nippon

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Posted 22 May 2019 - 09:06 PM

Today was the first day I have personally seen or been able to touch any unitron.

Very cool. I lusted after the Questar for years too and still do. Makes no sense though with really good 4" apos that are actually affordable. But the Unitrons and any quality long focus doublet achromat still has a lot to offer in my opinion.  


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#12 starman876

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Posted 22 May 2019 - 10:07 PM

The drive does work very nice.   However, they are very expensive.  They are rare for the 128 and go upwards of $400 easy.  The astronomy shop offers their design for Unitron for around $300. 


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#13 Kasmos

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Posted 23 May 2019 - 03:44 AM

Very Pretty. Is the 128 a 60mm or 3"?

Technically the 114 and 128 were both labeled 62mm on the focuser and some cells until about 1958-'59. The earliest cells (about '55 and earlier), were unmarked. After that, they were marked 60mm. I've never read any confirmation that they actually changed in size. That said, the lenses are probably all 62mm in diameter with a clear aperture of about 60mm.


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#14 Chuck Hards

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Posted 23 May 2019 - 08:15 AM

A RA drive is almost essential for planetary viewing, or group viewing at high power.  If you are observing solo, you really can get by with just the manual slow-motions.  But a drive is always a nice option and I'll use it if the scope has one.


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#15 terraclarke

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Posted 23 May 2019 - 08:20 AM

A RA drive is almost essential for planetary viewing, or group viewing at high power.  If you are observing solo, you really can get by with just the manual slow-motions.  But a drive is always a nice option and I'll use it if the scope has one.


Amen! I was observing the moon recently with my Tak FC76 on my Celestron Omni CG4 with the little Orion EQ-3 RA drive out on the deck. I forgot I left the drive on and went inside for an hour or so. I came back out and the moon was still in the field.
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#16 starman876

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Posted 23 May 2019 - 08:49 AM

A RA drive is almost essential for planetary viewing, or group viewing at high power.  If you are observing solo, you really can get by with just the manual slow-motions.  But a drive is always a nice option and I'll use it if the scope has one.

almost impossible to view planets at high power without a drive.  Besides, it makes it so much more enjoyable to just sit there without touching the scope.  


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#17 Bonco2

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Posted 23 May 2019 - 03:45 PM

While it's nice to have a drive on a Unitron mount, they are easy and enjoyable to use manually. The controls are conveniently placed and very smooth to operate.  If your polar alignment is fairly close you normally have to just operate the RA slomo for extended views. So for me, I hardly ever use the electric drive on my 142. Also the Unitron electric drives  get in the way in certain parts of the sky. I'm considering selling my drive for these reasons.

Bill


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#18 Piggyback

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Posted 24 May 2019 - 10:05 AM

I utilize a clutched Polarex/Unitron RA motor on my Polarex 75/1200mm NS 131 achromat. Very nice! I never run it in moist atmospherics, though. Don't trust electric safety with my 220 Volt unit. 


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#19 starman876

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Posted 27 May 2019 - 01:22 PM

I utilize a clutched Polarex/Unitron RA motor on my Polarex 75/1200mm NS 131 achromat. Very nice! I never run it in moist atmospherics, though. Don't trust electric safety with my 220 Volt unit. 

you could run it with an isolation transformer.  




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