MI-250 Go-To

$7250

Shown with a C-11 not included

See the new MI-SD Saddle assembly! Click here

We are pleased to announce some significant and exciting new changes in the design of the MI-250. These changes have been in development for months and are now a part of the standard package.

A tool is NO LONGER NEEDED to adjust the RA and declination clutches. Convenient clutch knobs are integrated into the new design.

The RA and declination axis have been redesigned to enable the user to access the gears at home and with the simplest of tools or mechanical understanding. In the past, cleaning or re lubricating would require the user to send the MI-250 to us for maintenance. This is no longer the case. Click here for more info.

Additionally, the face of the RA and declination shafts (the part you see) is expertly machined from aircraft grade aluminum and then a hard, clear anodizing keeps it corrosion free.

The Mountain Instrument deluxe saddle plate is now standard. The spring loaded deluxe version allows the user to "tip-tilt" the OTA into the saddle as opposed to lifting up and sliding down. A real plus for heavier OTA's.

We know you will appreciate the changes!

Notice to existing customers: Currently there is no option to retrofit existing mounts with the newer style of RA and dec axis. There may be in the future however price and availability has not been determined.

The Mountain Instruments (MI)-250 Go-To is a rock solid German equatorial mount that features a 7.5" RA and declination drive and matching worm and the Losmandy Gemini System. This robust field mount was engineered and designed for SCT's, refractors, and Newtonians alike. For those requiring true versatility in an affordable package without sacrificing incredible stability, this is your mount.

azimuth and elevation lock down assemblies

Super Deluxe spring loaded saddle assembly

The conical polar housing has been expertly cast in a #319 aluminum alloy, heat tempered, and then painstakenly machined. Based in part on the Russell Porter designs, the polar shaft is also conical in shape for maximum stability. An internal slip clutch has been integrated for silky smooth movement of the RA axis. The entire gear train, electronics, and bearings are internal. Perridoc error is very low and smooth. Average 3-5 arc sec.

Like the polar base, the declination axis features a conical shape offering total rigidity. Additionally, a 7.5" gear and matching worm is utilized. The isolated counter weight shaft is independent of the declination shaft and is easily removed for transportation. The RA and Dec worm/gears are diamond lapped for the ultimate smoothness.

Fine tuning in altitude and azimuth are effortlessly performed without the need of tools! Smooth adjustments in both axis. Positive ratchet type lock-down then secures both axis for trouble free and tool free use.

The wear resistant powder coated castings, with black anodized aluminum, flawless lines and fine craftsmanship, make it as beautiful to look at as it is to use. And the best for last.......Timely delivery!

Polar Assembly

• 75 pound payload capacity (dependent on moment arm of OTA and type of pier) 
• Easy 5 minute set up time 
• 7.5" RA drive 
• Matching precision ground worm 
• Conical shape for maximum rigidity 
• Conical polar axis 
• Major polar axis bearing-3.74" diameter 
• Variable friction slip clutch 
• Beautiful powder coated and black anodized finish 
• Redesigned altitude and azimuth adjustments! 
• Total RA (conical section) weight-36 pounds 

German Declination Assembly

• Conical shape 
• 7.5" RA drive 
• Matching precision ground worm 
• 3.74" major bearing 
• Easily secures onto polar base in less than 2 minutes 
• 28 pounds total-. (not including c.w.'s or shaft) 
• Isolated and removable counter weight shaft 
• 20 pound counter weight (2 ea) 10 ound weight available
• Same attractive powder coated and anodized aluminum as polar base 
• Deluxe saddle plate standard-Accepts all Losmandy, AP, and Cassidy male dovetail plates 
• Easy access to RA and dec clutch adjustments - No tools necessary
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• Gemini Servo System Features Level 4
• Detailed info can be found at http://www.docgoerlich.com/