ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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I've been consumed of late with a personal project, so haven't been buying much...I've also been neglecting my small (but perfectly formed) personal collection...however, after a long drive today, this recent addition may change that.
The only place I can find this scope from Mizar is in one of Galakuma's catalogues (the 1988 version), and unfortunately, my Japanese is...ahem...poor. Otherwise, this telescope seems to just not exist online. I wonder why the disappeaing act? Has anyone seen this scope before? Is it that rare? 
Here's the link to the catalogue (page 5):
http://yumarin7.sakura.ne.jp/retrokan/Mizar1988.pdf
It's mostly metal, pretty heavy, and very dusty, although the optics are fairly clear. I've not looked through it yet, but have vague hopes for this evening.
It's a 150mm catadioptric, and upon first (brief) imspection, the correcting lens in front of the focuser suggest it might be a corrected Dall-Kirkham (although I'm open to other suggestions). I'll post more pictures later, but here's the label for starters:
Any information or feedback would be welcome...
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woodsman
Pooh-Bah
Reged: 03/12/08
Posts: 1073
Loc: Colorado Springs, CO
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That is an interesting catalogue, the front page is in English and then not a word after. Only thing I could gather was the pricing in yen. Of course who knows what the pricing is for, the scopes or the mounts?  I'm certainly looking forward to more photos. Did it come with the tremendous mount shown in the catalogue?
Rich
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artisticwoods
C-14 Orange Tube, C-8, C-5, C-90 Astro Model, C8 Schmidt Camera 8" f1.5, C5.5 Schmidt Camera f1.65, SPI 42mm f/19 Refractor, Sears 90mm f/15.56 Ref, Sears 80mm f/15 Ref, Swift 77mm f/13 Model 831, Scope 60mm f/11.7, Sears 50mm f/12
Unitron Model 140 75mm/1200mm, Unitron model 128 60mm/900mm
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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Quote:
Did it come with the tremendous mount shown in the catalogue?
Sadly no, it came with one of the lighter weight (well, I say lighter, it doesn't feel lighter) models shown on the previous pages.
Back home now, and I've had a real fast look...star images are a total spider's web, so serious collimation will be needed. I love collimating.  
I've had a chance to take a few more pictures. Here's the entire set up. The mount is strong & heavy, but needs a bit of attention. It has a very nice polar scope too...
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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Thick dust & grime over the exterior...I don't think this has been used for some time.
Mount close up:
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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The whole construction is very solid, with the secondary collimation screws neatly covered underneath a metal threaded cap. Although you can't see it, the corrector lens is buried deep inside the baffle tube at the focus end.
Tube interior:
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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Rear of the ota:
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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...and another picture of some bonus items I was not expecting. 
So, does it ring any bells? Has anyone seen this before? Uncle Rod...Galakuma, any input or thoughts you may have would be gratefully accepted!
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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JamesE
Pooh-Bah
Reged: 10/22/07
Posts: 1117
Loc: Westbank, BC, Canada
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Nice Score Rich. I love the EP's. Are the 3 large slotted screws in the rear cell for collimating the mirror?
Cool find.
James
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James
(Thanks to Attilla for the Clear Sky charts)
Current Projects : Tasco 15TEA - 3 inch pier mounted planetary scope
Priorities : Wife, Kids
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deSitter
Carpal Tunnel
Reged: 12/09/04
Posts: 2926
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It's not a DK, it's probably supposed to have a Mangin corrector, like a Klevtsov. These are good candidates for small scopes because all the surfaces are spherical, but the corrector lenses are usually up front and the secondary is a rear-surfaced mirror (Mangin corrector). The Russian company TAL makes large Klevtsovs.
-drl
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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Quote:
Are the 3 large slotted screws in the rear cell for collimating the mirror?
James
I believe so, but a slight tweak of the secondary adjustment screws improved things alot last night, so I haven't moved the three rear ones yet.
Quote:
It's not a DK, it's probably supposed to have a Mangin corrector, like a Klevtsov. These are good candidates for small scopes because all the surfaces are spherical, but the corrector lenses are usually up front and the secondary is a rear-surfaced mirror (Mangin corrector). The Russian company TAL makes large Klevtsovs.
drl
I'm familiar with the Tal Klevtsovs, and I did think about that. However, unlike the corrector in the Klevtsov, this scope has it at the rear of the baffle tube, right in front of the focuser. The optical diagram in the catalogue actually shows a set of 2 correcting lenses in this place...
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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deSitter
Carpal Tunnel
Reged: 12/09/04
Posts: 2926
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Does it have a back-surface secondary?
-drl
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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Quote:
Does it have a back-surface secondary?
-drl
Sorry, not 100% on what a back surface secondary is...  
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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deSitter
Carpal Tunnel
Reged: 12/09/04
Posts: 2926
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A sub-aperture cat usually has a Mangin mirror, which is both mirror and lens because the coating is on the back side.
-drl
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ukcanuck
Vendor (Skylight Telescopes)
Reged: 11/07/06
Posts: 738
Loc: London, UK
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Quote:
A sub-aperture cat usually has a Mangin mirror, which is both mirror and lens because the coating is on the back side.
-drl
I'm with you.
Without actually removing the secondary holder & mirror, it's not immediately apparent whether the secondary is a mirror, or mirror/lens. The housing is not vented from the rear in any way, and does not provide any clues...meanwhile the secondary itself is buried inside a fairly deep baffle tube.
I think the next step is to try and find someone who can read the catalogue...hopefully that will shed some light on it.
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Richard
A few nice telescopes.
...but most importantly, a beautiful son who fills my days with sunshine, and my nights with stars.
THE SKYLIGHT F15
Skylight Gallery
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desertrefugee
Pooh-Bah
Reged: 08/06/07
Posts: 1217
Loc: Arizona
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Are those .965" eyepieces?
That AR40 Circle T looks exactly like a .965 I have - one with a narrow FOV, but razor sharp, contrasty views.
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"Illimitable ocean, without bound, Without dimension, where length, breadth, and height, And time, and place are lost." - Milton
-Darrell
Reflectors - 76 to 305mm (f4.7 to f9.2)
Refractors - 50 to 120mm (f5 to f16.7)
Binoculars - 6x15 to 22x100
N. Phoenix, AZ
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wfj
sage
Reged: 01/10/08
Posts: 259
Loc: California, Santa Cruz County
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The 40mm and 25mm look identical to the original EP's that came with an ancient C5. I use them on 0.965 scopes.
AH = Achromatic Hyugens.
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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1989
Loc: Hockessin, De
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On page 7 of the catalog is a picture of the optical layout and spot diagram. It uses a two lens coma corrector/field flattener located in the buffle tube. It most likely is a Dall Kirkham with the coma corrector since they are easier to fabricate then a Classic Cass.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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desertrefugee
Pooh-Bah
Reged: 08/06/07
Posts: 1217
Loc: Arizona
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Quote:
AH = Achromatic Hyugens.
Yup. I typo'ed the type. Thanks for the correction. I don't know why, but I'm just surprised that big ole scope used .965" EPs.
A very nice acquisition, by the way.
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"Illimitable ocean, without bound, Without dimension, where length, breadth, and height, And time, and place are lost." - Milton
-Darrell
Reflectors - 76 to 305mm (f4.7 to f9.2)
Refractors - 50 to 120mm (f5 to f16.7)
Binoculars - 6x15 to 22x100
N. Phoenix, AZ
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TimD
scholastic sledgehammer
Reged: 02/16/05
Posts: 905
Loc: CA USA
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Neat scope. have never seen one exactly like it, it is definitely something different.
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Takahashi TSC 225
WO Megrez 102
Meade ETX 90, ETX 125
Meade LX90
Classic Orange tube C14, C90, C5+
Etc,Etc,Etc!!
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tim53
Pooh-Bah
Reged: 12/17/04
Posts: 1454
Loc: Highland Park, CA
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Drop a webcam in the drawtube and show us the moon or Jupiter! 
-Tim.
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"We`re just waiting looking skyward as the days come down.
Someone promised there`d be answers, if we stayed around."
-Orchestral Maneuvers in the Dark, "The Romance of the Telescope"
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