By Albert G. Ingalls
Definitive booklet on novice telescope making. comprises plans and idea on numerous types. matters coated: Newtonian Telescope replicate Making; Optical trying out; Workshop knowledge; and Observatory constructions.
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Extra info for Amateur Telescope Making
Riflescopes may have fixed or variable (zoom) magnification. 5–25 × 56. Length and weight of a typical midsize riflescope are about 300 mm and 330 g. These parameters vary significantly with objective size and magnification. Built-in precision azimuth and elevation mechanisms allow adjustment (“zeroing”) of the LOS of the optics relative to the rifle bore to correct for ballistic drop and windage effects on the bullet at the target range. Nearly all riflescopes are of Keplerian form with lens erecting systems.
The scope is carried at one end of the crossbar. A counterweight is placed at the other end of the crossbar for balance. This head is relatively compact and stiff but heavy due to the counterweight. The equatorial fork head is shown here. It does not need a counter-weight and is not as stiff as the GEM, due to the long overhang of the scope with respect to the polar bearing. –Cass. –Cass. If used with a refractor, the fork arms would be impractically long. Some fork mounts are designed to be used as an Alt/Az or tilted back for use as an equatorial.
Commercial focal reducers and correctors for field curvature are available to improve performance in this mode of operation. –Cass. The larger length of the former is a contributing factor here. Here, also, the primary may be spherical. The Zeiss spotting scope shown on page 30 is an example of the use of this form. ) scope features a meniscus lens corrector inside the focus of the spherical primary mirror. This corrector reduces the spherical aberration of the primary mirror. –Cass. –Cass. of the same f /number is higher image quality, hence a smaller image spot size.