{"id":93341,"date":"2026-01-10T15:29:02","date_gmt":"2026-01-10T14:29:02","guid":{"rendered":"https:\/\/www.telescoop.nl\/?post_type=product&p=93341"},"modified":"2026-09-04T14:05:00","modified_gmt":"2026-09-04T12:05:00","slug":"omegon-roller-bearing-dobson-l-300mm-400mm","status":"publish","type":"product","link":"https:\/\/www.telescoop.nl\/en\/omegon-rollager-dobson-l-300mm-400mm\/","title":{"rendered":"Omegon Roller Bearing Dobsonian L for 12 to 16 inch"},"content":{"rendered":"

Omegon Rollager Dobson L for 12 to 16 inches: smooth azimuth movement for large Dobson telescopes<\/strong><\/h2>\n\n\n\n

Large Dobson telescopes have a recurring problem with their azimuth movement. The base plates slide over each other via plastic pads, and with the weight of a 12 or 16 inch tube this friction is considerable. You have to push to get the telescope moving, and as soon as it comes loose it shoots off.<\/p>\n\n\n\n

This is still possible at low magnification, but at 200 times or more you lose the object every time. A roller bearing replaces the sliding motion with a rolling one, so the force you need to start is almost the same as the force to move.<\/p>\n\n\n\n

\"Omegon<\/figure>
\"Omegon<\/figure>
\"Omegon<\/figure>
\"Omegon<\/figure><\/figure>\n\n\n\n

Rolls instead of sliding<\/h4>\n\n\n\n

The rolling elements are located between two steel plates. They distribute the weight over the entire circumference, so that the load is not concentrated anywhere.<\/p>\n\n\n\n

The difference with sliding bearings lies mainly in the release. With a sliding bearing, the force to start moving is higher than the force to continue moving, and that shock absorbs most of the energy. With a rolling bearing, that difference largely disappears.<\/p>\n\n\n\n

Dimensions and assembly<\/h4>\n\n\n\n

The outer diameter is 460 mm, the inner diameter 13 mm and the height 5 mm. The lower part sits between the ground plate and the rockerbox\u2019s rotating plate, around the central bolt.<\/p>\n\n\n\n

Measure the diameter of your ground plate in advance. The lower part should fit within the plate and not protrude beyond it.<\/p>\n\n\n\n

For which Dobson size<\/h4>\n\n\n\n

This version is intended for Dobson telescopes from 12 to 16 inches. If you have a smaller instrument from 6 to 12 inches, choose the smaller version with an outer diameter of 320 mm.<\/p>\n\n\n\n

Featured accessories<\/h3>\n\n\n\n

Every Dobson telescope comes with a laser collimator: a reflecting telescope regularly requires alignment. Starting at an aperture of 8 inches, a moon filter is a welcome addition, as the full moon becomes very bright at that light output.<\/p>\n\n\n\n

For whom yes and for whom no<\/h3>\n\n\n\n