The wave function is a measure of the surface accuracy of the mirror. Don't buy a diagonal for its reflectivity measure, buy it for its wave measure, with a 1/10 wave mirror being better than, say, a 1/4 wave mirror. The real selling point for this little star diagonal is its 1/10th wave mirror. Comments:ĭon't be put off by the no-frills, plain plastic body of the GSO 1.25 star diagonal, it's a great little performer and an excellent value. Nothing specific, maybe the plastic housing. Very good mirror, lightweight, best value in star diagonals out there. It not meant for use with Newtonian / Dobsonian reflector telescopes or other variants of Newtonian telescopes.Ĥ.0 Very nice, lightweight star diagonal Pros: Please Note: This diagonal can only be used with refractor telescopes and some catadioptric telescopes like Schmidt-Cassegrain, Maksutov-Cassegrain, etc. The diagonal comes with 2 end caps and weighs 3.8oz. The 1.25" nosepiece is threaded to accept standard 1.25" astronomy filters. The prism housing is made of precision molded ABS plastic and the two end barrels are precision machined from aluminum. It can also be used for astronomy applications, especially when you would like to match the orientation of the star field with "correct" star maps and charts. This is a great diagonal for daytime terrestrial use with small telescopes or spotting scopes. It produces an image that is oriented properly, which means that the image is upright and correct from left to right (i.e., a correct, non-inverted, non-reversed image). GSO's 1.25" 90-degree diagonal features an image erecting Amici prism that allows you to look into a telescope at a 90 degree angle.
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