The vertical motion of the STAR TRACKER tube is consistently ball-bearing smooth.
![]() NW 8 kg GW 10 kg GS 990 Tube Bottom.: 64 cm x 64 cm x 76 cm3. Looking directly at the SUN through this device can result in partial or complete loss of vision. For observing the SUN, we recommend you buy a Solar Safety Film for this Telescope. This little telescope will show many objects in direct vision for easy location. The bracket is held in place in the mounting shoe by a single large hand-tighten knob that maintains the finders collimation, even if the finder is removed between observing sessions. The bracket has two hand-adjust collimation screws that work in conjunction with a third spring-loaded post in the bracket. This makes collimation faster than the traditional three- or six-screw collimation methods used with conventional finder brackets. It is our firm opinion that GSO offers better mirrors in this price range. We guarantee a diffraction-limited performance, which essentially means that the performance is limited by observing conditions and the laws of physics. Gso Dobsonian Telescope Free Of InternalThe mirror is made of B270 water white optical crown glass that is free of internal stress and striae. B270 glass is equivalent to BK7 in performance and optical quality. The thermal stability of B270 glass is generally better than the soda lime float glass used for the mirrors of most reflectors in this reasonable price range. The mirror is ground and polished under computer control for guaranteed diffraction limited performance, coated with 91 reflectivity aluminum, and overcoated with a protective layer of silicon dioxide (quartz) for long life. The open frame of the cell allows the mirror to cool down to ambient temperatures quickly, so you can start observing sooner. Large hand-tighten color-coded push-pull collimation and collimation lock knobs make it easy to collimate the primary mirror with no tools required. The second is a fully multicoated high power 1.25 9mm (133x) 52 field Premium Plssl eyepiece. The telescope can be balanced by moving it up or down a couple of centimetres. This may be necessary when adding or using very heavy eyepieces or a Camera. A scale on both sides allows you to easily achieve a symmetric bearing position. The aluminum bearing housings fit snugly into cutouts in the sides of the altazimuth base. Because the bearings are sealed systems, the elements cannot affect the smoothness of the vertical motion, as it can when dust and grit invariably get trapped between the exposed trunnions and Teflon pads of conventional Dobsonians and scores the surfaces.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |