Losmandy GM-8 Equatorial Mount with Tripod
Losmandy GM-8 Equatorial Mount with Tripod
If you're tired of messing around with equatorial mounts that just can't handle your observing and imaging requirements, the Losmandy G-8 is definitely worth a look. This heavy-duty mount is machined of aluminum and stainless steel, utilizes all stainless steel hardware and has a load capacity of 30 pounds.
The telescope attaches to the mount via a dovetail bar bolted to the bottom of the telescope. Before you attach the optical tube, make sure that the declination and right ascension clutch knobs are tight. This will ensure that the mount does not move suddenly while attaching the telescope. Let's check out the various parts that make up the Losmandy GM8 Equatorial Mount...
Once the telescope is set up, you will need to point it at various locations to observe different objects. Unlike other mounts, the Losmandy mounts have a clutch system. To make rough adjustments, loosen the R.A. and DEC clutch knobs slightly and move the telescope in the desired direction. The R.A. clutch knob is near the Polar Axis Finder while the DEC clutch knob is at the top of the counterweight bar. How tight should the clutch knobs be? You set the clutch knobs to the friction you like. When you want to move the telescope, all you do is grab the telescope and move it to its new position.
Below is pertinent technical information on your Losmandy GM 8 telescope that technophiles may find useful.
Losmandy GM-8 Equatorial Mount and Tripod Specifications
- All machined aluminum and stainless steel, black anodized.
- All stainless steel hardware.
- One 2.100" diameter needle thrust bearing.
- One 2.000" diameter needle thrust bearing.
- Two 1.500" diameter needle bearings.
- 2.812" diameter, 7075 aluminum worm gear, 180 tooth.
- Dual supported, ball bearing housed stainless steel worm-heat treated and ground.
- Variable slip clutch, both axes. One knob design.
- 1.250" diameter aluminum shafts.
- Fully locking, unique tangent arm design altitude adjustment, 0-64 degrees, large knob for easy alignment.
- Laser engraved latitude scale in 2 degree increments.
- Single knob azimuth control, bi-directional +/- 8.5 degrees.
- 3.500" diameter laser engraved setting circles 6 minute R.A. / 2 degrees DEC. R.A. circle engraved for Northern and Southern Hemisphere.
- Porter slip ring design.
- 160 oz/in stepper motor, 1.0 arc sec. step.
- Spit Dovetail saddle-plate design. Accepts "D" series dovetail plates. Dovetail plate drops in and locks allowing for interchanging of any tube assembly, reducing the need for DEC weights.
- Removable stainless steel weight shaft w/safety knob.
- 7 lb counterweight.
- 11 lb and 21 lb. extra counterweights available.
- Through the axis polar scope, works in Northern and Southern hemisphere. Polar scope optional.
- Instrument weight capacity 30 lbs.
- Equatorial head weight 21 lbs.
- Tripod: All machined aluminum, black anodized.
- Tripod height, adjustable from 27" - 43"
- Fold-up tripod design for easy transporting.
- Tripod weight 15 lbs.
- Dual-Axis Electronics: Diamond push button pattern.
- R.A. and DEC. reversing switches.
- Three guiding rates
- 30%, 50% and 2x sidereal rate.
- Three setting rates
- 4x, 8x, 16x sidereal rate and super fast 32x HST (high speed transfer).
- Quartz tracking rates: sidereal, solar, lunar, king.
- Periodic Error Correction (PEC).
- Programmable DEC. Backlash Compensation (TVC).
- Control panel dimmer.
- Accepts auto-guider systems.
- Northern and Southern Hemisphere operation.
- 12 volt DC - 500ma power use.
- Tiltable control panel for easy access.
- Small hand control box for comfortable use.
- All heights are to top of tripod. Add 9" @ 34 degrees to center of Dec.-R.A. junction. Add 6" from Dec.-R.A. junction to top of saddle.
Your Losmandy GM 8 telescope comes equipped with setting circles that translate the celestial coordinates into a precise location for the telescope to point. The daily motion of the Sun across the sky is familiar to even the most casual observer. This daily trek is, of course, not the Sun moving as early astronomers thought, but the result of the Earthƒ???????????s rotation. This rotation also causes the stars to do the same, scribing out large circles as the Earth completes one rotation.
In order for the telescope to track the stars, you must meet two criteria, First, you need a drive motor that moves at the same rate as the stars. A polar axis finder is offered as an optional accessory. The second thing you need is to set the telescopeƒ???????????s axis of rotation so that it tracks in the right direction. Since the motion of the stars across the sky is caused by the Earthƒ???????????s rotation about its axis, the telescopeƒ???????????s axis must be made parallel to the Earthƒ???????????s. The polar axis is the axis around which the telescope rotates when moved in right ascension. This axis points in the same direction even when the telescope moves in right ascension.
Although there are several methods of polar alignment, you will never use all of them during one particular observing session. Instead, you may use only one if it is a casual observing session. Or, you may use two methods, one for rough alignment followed by a more accurate method if you plan on doing astrophotography.
Losmandy Product Number: GM8
Questions & AnswersAsk a Question
Will the GM8 accept a Vixen VMC 200L telescope?
Yes, the current version of the GM8 includes a dual D/V saddle and so the VMC200L telescope will be able to mount without any adapters needed. You may want to consider an additional 7 or 11 lb counterweight, depending on how much additional weight you wi