MikroScopes

Precision 1/12 scale fully operational telescope OTAs

(optical tube assemblies)

Note: these are only made for MikroMount1 customers

link to MikroMounts

Very limited availability

 

2" f/11 Maksutov and a 1 1/2" f/4.5 Newtonian with 1/2" minor axis diagonal....interchangeable 5/8" dia. eyepieces in them

The male model is 1/12 scale or ~6" high

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Features of my scale model OTAs

All metal construction following 1/12 scale as much as possible with miniature optics etc.

All OTAs include a miniature Ramsden 3 ocular set: 20mm fl, 10mm fl, 6mm fl. in fitted wood case. These are custom 5/8" nominal diameter which is just half the size of standard 1 1/4 eyepieces. Actual focusing mechanism varies with each type. All are useful telescopes, but please don't expect an Airy disc etc. These are scale models that are built to look and function like full size. An abreviated webpage to some of my previous products is at Centurion 18

For video search MikroMount1 in Youtube.

 

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1 1/2" f/4.5 NEWTONIAN (one of a kind offering)

 

7" focal length x 1 1/ 2" diameter primary mirror. Miniature 1/2" minor axis x 1/8" thick elliptical diagonal. Collimation is set and fixed. Light weight aluminum tube with 1.75" O.D. x .035" wall x 8" length with machined ends. A carbon graphite looking cover cloth is applied on the exterior. Inside is painted flat black. Focusing is by primary mirror movement at rear with very fine 5/8 x 20 TPI spindle rotation and zero image drift. The rack and pinion type focuser has rotating fine knurled brass knobs but is non-functional aside from holding the eyepieces. Magnifications are approximately 9x,14x,and 29x. Low power is about a 5 deg. FOV.The optical tube assembly is a secure friction fit in the saddle and can be both rotated and repositioned or removed as desired. Primary mirror is spherical, yet offers very good sharp/contrasty images. Oculars are basic 2 element Ramsdens. Secondary mirror has a 94% enhanced coating. The spider is functional and attached by tiny nuts and bolts and washers. The images are inverted per a normal astronomical Newtonian telescope. Workmanship is 1st class. Can be easily balanced to perfection on the mount. There is even a brass counterpoise on the dec cradle located diagonally to the dec drive mechanism. OTA weight is just 5 1/2 ounces.

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2" f/11 Maksutov Cassegrain

 

23" nominal focal length. A miniature 5/8" diagonal prism and 3 ocular set with wood case are included. These are very close to parfocal. Focusing is by primary mirror movement at rear with very fine motion and minimal image shift. Image is erect and reversed left to right per a standard Cassegrain telescope. Baffling is very good on both primary and secondary mirrors. The tube is machined from a much heavier 1/2" wall aluminum tube. OD is ~ 2 3/8" x 4 1/2" long (not including diagonal). There is no end cap for the corrector. Careful attention was paid to all the work on this. Optics are fabricated outside the USA. This is a 1/12 scale model of a 24" Maksutov telescope. Visual magnifications are ~ 29x, 46x, and 95x. Low power is about 1 deg. FOV. Contrast drops off some with the 95x, but OK for moon and 5 major planets. Don't expect an Airy disk from this working model. This telescope/mount can be attached to a standard camera tripod for zenith viewing. Telescope weight is less than 3 pounds with mount. OTA weighs 9 ounces. The mikromount1 handles this very nicely and can be balanced to perfection. Per below right photo it is possible to use .965 eyepieces with this telescope. The diagonal attachment hub on telescope accepts both my miniature 5/8" diagonal and an optional modified .965" diagonal. Note the huge difference in size between them.

 

 

 

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2" f/6 Catadioptric Cassegrain

 

12" focal length. This is a very specialized compact telescope lens assembly made from a modified (12 hours) high-end camera lens by Tokina. Focusing is via rotating the front ring very small amounts. Focusing is smooth and positive. A miniature 5/8" diagonal prism and 3 ocular set with wood case are included. These are very close to parfocal. Image is erect and reversed left to right per a standard Cassegrain telescope. Baffling is very good on both primary and secondary mirrors. Corrector lens has a multicoat AR coating. Diagonal is fully rotatable and must always be used to achieve image focus. The optical tube assembly and components have been light weighted as much as possible to keep the total weight down to just 7 1/2 ounces.

The optical tube is attached to a custom wooden saddle since it is just 2 1/4" length. It so short that the standard declination saddle can not used, so there is just a clamp to lock declination movement (no slow motion tangent drive). It is not possible to motorize the dec axis for this OTA, however a complete standard declination saddle is also supplied for customer conversion back to the standard mount configuration per photo below. This is very simple requiring one included hex wrench.

Visual magnifications are ~ 15x, 24x, and 50x. Low power is about a 3 degree FOV. Contrast drops off some with the 50x, but OK for moon and 5 major planets. Don't expect an Airy disk from this working model. This is a 1/12 scale model of a fast 24" Maksutov telescope. The mikromount1 handles this OTA very nicely. This telescope/mount can be attached to a standard camera tripod for zenith viewing. The diagonal attachment hub accepts both my miniature 5/8" and optional modified .965" diagonal. Below is image of 5/8", .945", and standard 1 1/4" diagonals with an eyepiece for size comparison. This OTA is smaller than many 2" eyepieces. Lens cap not shown.

 

Options available are 2 axis motor drives and bronze legs.

Included Dec. axle assembly on right can be motorized for use with other 1 3/4" OTAs

 

 

 

Please ignore rubberband

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Almost all mount options are available with the above OTAs.

Above OTA prices available by request only to mount customers and they are not cheap

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To purchase a MikroScope OTA contact Jim Riffle by email at mikromount@gmail.com

Only the actual shipping charge will be added on. I can send a PAYPAL invoice to your email for payment.

The MikroMount/Scope is a limited run, therefore is subject to sell out.

Any questions are gladly answered, please ask via email.

Link back to MicroMount page