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. 36 Answers SOURCE: If there is nothing on the objective lenses or eyepiece lenses then it most likely needs collimation. This is where you adjust the secondary mirror while viewing an out of focus star. You need stable sky conditions to do this.
There are most likely three small screws at the front of the telescope and these are what you use to adjust it. As one screw is loosened then another is tightened. Do this in very small increments. If you have your manual it should outline how to perform this. If not go to this web site: It will show examples of how objects look both in and out of collimation.
There is a section further down the page for SCTs. A very handy tool for this is to replace your screws with Bob's Knobs (. These replace the screws and allow you to adjust it by hand instead of a screwdriver. The other focusing problem I've experience with my Celestron SCT is to have the focus knob loosen up and then slip as I turned it so that I could never focus with it.
Good luck and clear skies! -jodair Posted on Mar 30, 2009.
The return of the extremely popular ETX125 takes mobile astronomy to the next level. We know you were excited about the 80mm and 90mm apertures.
Now, the return of the extremely popular ETX125 takes mobile astronomy to the next level! This large 127mm Maksutov-Cassegrain telescope marries the portability of the ETX with Meade’s premium optics. Enjoy detailed close-up views of the Moon and planets, and be amazed by the stunning views of star clusters, nebulae, and more!. Fork Mount with DC Servo Motors. Full Size Steel Tripod with EQ tilt plate. 9.7mm and 26mm Super Plossl eyepieces.
127mm f/15 Maksutov-Cassegrain Optical Tube Assembly. Internal 90° Degree Diagonal. AudioStar controller containing over 30,000 celestial objects. Internal Flip Mirror System The ETX125 Observer is a fully-featured GoTo telescope that includes the AudioStar® controller, the heart of this computer guided telescope. In addition to finding and tracking objects in the night sky for you, the AudioStar® controller boasts a number of features of its own, including a 30,000+ object database, built-in speaker, and over 4 hours of of audio content that educates you about objects you observe. Whether you’re observing on the go or from your backyard, the ETX125 Observer will make exploring the night sky easy, educational, and exciting.
The beloved ETX125 telescope is back. Go ahead, start exploring! ETX80 Observer ETX90 Observer ETX125 Observer Opticstar Retail Price (inv VAT) £285.00 £445.00 £645.00 Product Code 204 205005 Clear Aperture 80mm 90mm 127mm Optical Design Achromatic refractor Maksutov-Cassegrain Optical Coatings Multi-Coated UHTC™ - Ultra High Transmission Focal Length 400mm 1250mm 1900mm Focal Ratio f/5 f/13.8 f/15 Resolving Power (Dawes' Limit) 1.45 arc-seconds 1.29 arc-seconds.