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Vintage 6" F23 Mystery Maksutov Restored

Discussion in 'Vintage Telescopes & Equipment' started by Bomber Bob, Oct 13, 2016.

Vintage 6" F23 Mystery Maksutov Restored

Started by Bomber Bob on Oct 13, 2016 at 12:37 PM

13 Replies 2532 Views 2 Likes

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  1. Bomber Bob

    Bomber Bob Well-Known Member

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    Haven't been on A/C in a while. My latest restoration was a 6" F23 Maksutov Cassegrain made by an unknown amateur back in the late 1960s / early 1970s (approximate dating based on the Unitron focuser). I snagged the scope probably because the ad was for a "Vintage, used, 1960’s, Unitron, D 75mm F 1200mm, telescope, lens, optics." But it was obviously not a Unitron, and it definitely looked home built.

    Here's a BEFORE shot:

    MM6_S00 - Original Condition.jpg
     
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  2. Bomber Bob

    Bomber Bob Well-Known Member

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    The Builder was obviously a skilled machinist, and I'm certain he bought the optics as a finished kit. Here's the back plate with its globe sockets, and the mirror plate, which tilts / adjusts because of those 3 round nuts.

    MM6_S09 - Mirror Cell Platter 1.jpg
     
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  3. Bomber Bob

    Bomber Bob Well-Known Member

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    At the other end is the thick Meniscus corrector. Oddly enough, neither this nor the primary mirror were ever baffled. I took care of that! In the picture, the baffle looks huge, but it's actually just 2.25" across.

    MM6_S45 - Secondary Baffle Attached.jpg

    On the front side, I enlarged my first black circle with more chalkboard paint.

    MM6_S49 - Secondary Spot Enlarged.jpg
     
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  4. Bomber Bob

    Bomber Bob Well-Known Member

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    Baffling options for the primary were limited by the brass threaded pipe the Builder epoxied into the center hole. I attached a vinyl ring around it, then wrapped a light plastic pipe with flat black foam (it won't damage the optics if it comes loose).

    MM6_S34 - Primary Baffle Parts.jpg
    MM6_P38 - Primary Baffle Attached.jpg
     
  5. Bomber Bob

    Bomber Bob Well-Known Member

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    For the paint, I chose mocha for the tube, and espresso for the trim, which coordinates with the vintage Spiratone 10x50 finder.

    MM6_S42 - OTA Reassembled (Right Side).jpg
    This is a stubby but HEAVY scope. Most times, it'll be on the Meade pedestal mount I made for the Tinsley Cassegrain, but the MM6 can also ride on the Edmund 4" refractor's GEM & tripod.

    MM6_S50 - Official Glamour Shot 6.jpg
     
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  6. Bomber Bob

    Bomber Bob Well-Known Member

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    How are the views? I bought this scope back in March 2015. My initial star tests back then were good - on axis - but there was a lot of glare. The baffling cut this to negligible, and boosted the contrast. I don't what company made the optics, but they are on par with my Questar. Saturn is stunning - even at its lower altitude. The FOV is tiny, but I don't mind. The MM6 is much more practical than a 6" F23 refractor, and has ZERO false color. Getting 173x from an HD OR20 is too cool!
     
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  7. Mak the Night

    Mak the Night Well-Known Member

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    Looks great, very nice restoration job.
     
  8. Dave In Vermont

    Dave In Vermont Well-Known Member

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    That's a fantastic looking scope! Wow! Your handiwork really has paid off extremely well.

    I'm sure I'm not alone in hoping to hear about your tests in-the-wild once you get the time. An F/23 Maksutov-Cassegrain is truly something you don't see everyday or night.

    I stand amazed & can feel the excitement from here -

    Dave
     
  9. Bomber Bob

    Bomber Bob Well-Known Member

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    Thanks y'all! Originally I saw this as a city scope, but with the rings and anodized steel thumbscrews it is secure on the Edmund mount, so it can be a field scope... For what? Globulars! It has near refractor contrast & resolution, and the small FOV isn't a limitation on these DSOs. I doubt it'll go out to the country often - it's a chore to tote!
     
  10. Bomber Bob

    Bomber Bob Well-Known Member

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    Made these comparison sketches between my Edmund 4" F15 and the Mystery Mak last weekend:

    ESC4_MM6 - Jupiter Sketches 20170430 T02.jpg
     
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  11. Ed D

    Ed D Well-Known Member

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    JW, your Mak restoration is nothing short of magnificent in every way. WOW!!!, what a beauty, especially atop that equally beautiful vintage mount. From the detail you show in your sketches I can tell the optics are very good.

    Ed D
     
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  12. Bomber Bob

    Bomber Bob Well-Known Member

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    Thanks! This Mak beats my very good RV-6 on Jupiter & Saturn, and runs even with my 6" F20 Tinsley Cass. Wish I knew where the ATM got the optics set.
     
  13. Scopejunkie

    Scopejunkie Well-Known Member

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    Nice scope Bob. As a lunar/planetary observer, I'm green with envy :) Hope it serves you well.
    Keith (Scopejunkie)
     
  14. Nebula

    Nebula Well-Known Member

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    Thanks @Scopejunkie for the resurrection if this thread.

    @Bomber Bob I like your way of sketching the planet Jupiter, it looks like a very efficient way of doing things with the rectangle shape. Very nice!
     

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