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Unitron 150 4" f/15 with Jaegers Baker Design Lens.

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#1 Stew44

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Posted 19 March 2018 - 06:28 PM

Classic f/15 refractors take on a whole new meaning at 4" and above.  I haven't posted a classic scope in awhile as I've been working hard on whittling down to my final fifteen or so.  I was down to three 4" classics (one an f/12).  Now I am back up to four.  Where I used to plan for an hour setup and hour take down for one of these, for this latest one I think things will go much faster on setup and will get to using much more quickly.  The scope was available locally so didn't have to worry about packing and shipping.  Probably an early one from mid 50's.  Mount is complete and probably does need some cleanup, and the OTA is certainly in need of paint or powder coating; but I bought it to use and will attend to those kinds of details later.  The original Unitron lens had issues and I look forward to messing with that.  This one came with a Jaegers lens of Baker air spaced design.  Spot diagrams for the two lens designs are pretty much the same so I'm pleased that this scope gives me the opportunity to try one of those.   Only other accessory of note accompanying the scope is the 10x42 finder.   Have some other Unitron stuff not associated with a scope and I'll look through that, but really this isn't so much collectable as kind of a nice workhorse grab and go.  The mount itself isn't unique for a 150, but the legs have clamp locks that are original and that probably makes them Polarex from what I understand.  Typical wooden clamp-on tray.  Hopefully it will see Jupiter tomorrow if skies are clear.

 

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#2 apfever

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Posted 19 March 2018 - 06:38 PM

Objective? Does it have writing on the front cell ring?

#3 starman876

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Posted 19 March 2018 - 07:12 PM

Nice scope.  Hard to beat the ease of use of those fork mounts.



#4 rolo

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Posted 19 March 2018 - 07:17 PM

I really liked my old 150...



#5 Chuck Hards

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Posted 19 March 2018 - 07:43 PM

Jaegertron!  

 

Very nice, Stew.  waytogo.gif



#6 Stew44

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Posted 19 March 2018 - 07:57 PM

There is no writing on the front of the cell Neal.  The lens was custom mounted to the OTA by Dave Trott, who machined the conversion ring.  And to be honest, even the original Unitron cell has no engraving on it.  The original lens is kept in the cell by a front retaining ring with three screws and no collimation is provided.  Original cell is here

 

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I'm planning on using some Baader original orthos with this and my 1.25 Goto eyepieces.  Bought an Astro Shoppe 1.25 draw tube adaptor awhile back and since I'm selling my 42mm and 60mm Unitrons I really did need one more scope to fully realize the investment. grin.gif

 

Sighting in the finder while daylight is still present and getting it ready for hopefully clear skies on the morrow.

 

 


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#7 Stew44

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Posted 19 March 2018 - 08:00 PM

Neal,  here's the Jaegers business end.

 

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#8 starman876

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Posted 19 March 2018 - 08:01 PM

The very early Unitron cells had no writing on them.   



#9 Stew44

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Posted 19 March 2018 - 08:05 PM

Johann, another example of why I should never sell anything, especially if I don't have a need for it.  Could you send me a picture of the open case with the 150 mount in it so I can pin it to my spare parts shelf and learn from my mistakes.  lol.gif



#10 starman876

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Posted 19 March 2018 - 08:30 PM

Johann, another example of why I should never sell anything, especially if I don't have a need for it.  Could you send me a picture of the open case with the 150 mount in it so I can pin it to my spare parts shelf and learn from my mistakes.  lol.gif

I sure can.   Of course the 150 case I have that I got from you  is not for a fork mount.   It is for the later alt AZ mount.



#11 Stew44

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Posted 19 March 2018 - 08:34 PM

REALLY?  Then I didn't screw up too badly.  What does a 4" altaz mount look like then (meaning I really would like to see the mount in the case smile.gif )?



#12 starman876

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Posted 19 March 2018 - 08:43 PM

I might have one. Let me check.



#13 starman876

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Posted 19 March 2018 - 09:19 PM

Here you go Stew

 

150 box.jpg

 

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#14 rolo

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Posted 19 March 2018 - 09:29 PM

Stew here's a pic of my old 150, hope you don't mind me posting it. Along with a Unitron Speed O Gram letter.

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Edited by rolo, 19 March 2018 - 09:30 PM.

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#15 Stew44

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Posted 19 March 2018 - 09:46 PM

Rolo, How cool is that letter! VERY! Thx.

#16 rolo

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Posted 19 March 2018 - 10:06 PM

How about that price!!


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#17 terraclarke

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Posted 19 March 2018 - 10:09 PM

How about that price!!

Yes, but that is acknowledged as the final payment. We don’t know what as already payed. (Tho my catalog from around then states $465 IIRC).



#18 rolo

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Posted 19 March 2018 - 10:27 PM

BINGO!

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#19 CHASLX200

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Posted 20 March 2018 - 05:15 AM

Back then prices were real and scopes were not plastic GO-TO junk like today.


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#20 starman876

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Posted 20 March 2018 - 06:27 AM

I have a few of those Unitron speed o grams.  It is nice to have all that documentation with a scope.



#21 Stew44

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Posted 20 March 2018 - 08:36 AM

Got the scope out on Jupiter this morning in clear skies but rather poor seeing and 20F.  At 120X with a 12.5 Goto Huygens I saw some detail on the planet but surface was boiling.  Lens looks good so far.

 

The mount is what I had hoped for.  Quick to setup, quick to attach OTA, quick to get to observing.   The lugs on the OTA are nice and tight in the yoke slots.  Some slop in the RA worm and I need to see if that can be adjusted.  Take down was quick as well and again what I expected.  All in all very pleased with this new acquisition.


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#22 rolo

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Posted 20 March 2018 - 01:21 PM

Nice! I remember one night observing Jupiter with my 150 and my friend with his C5, no contest. Even with the extra inch of aperture the C5 was far behind in sharpness and contrast. Not a bad scope but when you compare scopes side by side  you can really see the difference. I was pretty impressed  by the Unitron 150 that night.


Edited by rolo, 20 March 2018 - 01:22 PM.

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#23 starman876

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Posted 20 March 2018 - 01:38 PM

Nice! I remember one night observing Jupiter with my 150 and my friend with his C5, no contest. Even with the extra inch of aperture the C5 was far behind in sharpness and contrast. Not a bad scope but when you compare scopes side by side  you can really see the difference. I was pretty impressed  by the Unitron 150 that night.

It really is no contest between a good 4" refractor and a 5" obstructed SCT.  Besides, on the bench that 5" SCT will most likely come in at less than a 1/4 wave at best like most SCT's. It is sad but the truth.  The best SCT out there is the C9.25. Well, you found that outwaytogo.gif


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#24 rolo

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Posted 20 March 2018 - 03:37 PM

I have a friend that has two or three C5's. When he comes to pick up the Unitron 152 he'll bring them for a DPAC test.


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#25 Kasmos

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Posted 20 March 2018 - 03:49 PM

Some day I'll have to compare my 4" Jaegers to one of my C5s.  I really like it, but unlike a C5 the 4" is a lot more trouble to set up and can't be easily moved around the yard to dodge lights or find open sky for targets. That said, for best performance the C5s need to be collimated.


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