Customer comments/photos.
Updated 6/1/24

Other Dobsonian Goodies

Integrated EZ adjust setting circles.
For your mount, on our bearings, or specific for GSO/Apertura.

Height adjustment stands.

ATM Altitude and Azimuth
Bearing Parts

Laminate rings and strips.
Teflon pads.
Azimuth bolt assembly kits

Sharper Image Masks

Primary:Fix Turned Down Edge.    

Primary: Remove mirror clip flare.
Spider: Remove diffraction spikes.

Premium Mirror Cells
for 6" to 13.1" mirrors.

Each cell design calculated to optimize your mirror's performance. Eliminates mirror-clip aberrations for true circular aperture.

Clamshell & Rotating Rings

For Dobsonian mounts
For Equatorial mounts

About altitude bearings balance and motion.

Altitude bearings function much as do balance poles for tightrope walkers. Longer poles spread balance out over a wider area. Imagine being pushed at your shoulders with your feet/stance close together. You will be very unstable. "Lengthening the pole" (widening your footing) adds a great deal of stability. Larger altitude bearings achieve the equivalent of widening your footing. And an added benefit is adding finer incremental movement, with the increased bearing circumference moving each degree farther apart. The difference will make you a quick fan of larger bearings.

Customer photos/comments

5" factory bearings.

Bearing upgraded to 12".

5" bearings upgraded
quickly and easily to 12".
About balance and motion

Photos: (L) small factory 5" bearings, (R) upgrade attached externally.

Fit internal or external to side walls depending on mount design.

Bolt holes width and diameter customized to fit your telescope tube.

All parts included: bearings and supports, laminate, Teflon, screws.

12" Bearing Internally Mounted.

12" Bearing (UN-sanded).

Standard 12" and 18" bearings.
About balance and motion

All bearings use "3/4" inch Baltic birch plywood (18mm). Available as kits or finished. Finish uses gloss polymer from General Finishes.

Choose among these options - advise what you need or ask us:

Carry handles are built in.

18" bearing.
What you get: all parts included. Bearings, Teflon (with supports only), laminate strips, fine tuning assembly (optional).

What you need: Kits require glue for laminate (contact cement), glued with finished bearings, Torx (#8) and Phillips (#4) screwdriver, longer tube attachment bolts (if necessary).

Choosing between 12" and 18" altitude bearings
: Generally, the shorter the tube, the smaller your bearings can be and maintain balance. Larger tube diameters and/or heavier, the larger the bearing needed.

Several "rules of thumb" for bearing size exist, from 1.2 to 2.0 times the telescope's aperture. Size matters: Go bigger and have no regrets.


Contact for shipping cost.

5" Bearing Upgrades
5BUK 5" Bearings Upgrade Kit  $65
5BUF 5" Bearings Upgrade Finished $111
Standard 12" Bearings
S12BK Standard 12" Bearings Kit  $53
S12BSK Standard 12" Bearings with Supports Kit $67
S12BF Standard 12" Bearings Finished  $87
S12BSF Standard 12" Bearings with Supports Finished  $105
Standard 18" Bearings
S18BK Standard 18" Bearings Kit   $79
S18BSK Standard 18" Bearings with Supports Kit $99
S18BF Standard 18" Bearings Finished $121
S18BSF Standard 18" Bearings with Supports Finished $147
CSB Custom Size Bearings: Request quote.