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cassegrain telescope magnification formula

cassegrain telescope magnification formula

For example, in a 12.5" F/12.5 Classical Cassegrain, Kp = -1 for the primary and Ks = -4.00 for the secondary. However, if you see spherical aberration, digest the following: For Dall-Kirkham, the position of the (spherical) secondary makes a difference, too, as evidenced by the presence of the variables s and m in the equation for the value of Kp for the primary mirror. Magnification = Telescope focal length ק Eyepiece focal length. Magnification of a telescope is actually a relationship between two independent optical systems: the telescope itself and the eyepiece you are using. -If the secondary is moved TOWARD the primary mirror, the correction of the system will DECREASE. 1 - Basic Formulas for a Cassegrain Telescope. Physics - Formulas - Telescope Magnification: A common question when purchasing a telescope is what "power" it is. Thus, the distance A ends up being: Next is to figure out what the ROC of the secondary is and that is the formula: This completes the major dimensions of the Cassegrain telescope. This is done with the two formulas below. What Telescope Magnification Really Means. So, moving the secondary toward the primary should slightly increase the correction of a Dall-Kirkham system in the system. I hope I got all of the calculations right. This means that for Foucault testing, we simply multiply the ideal Foucault knife edge positions for a parabola by 1.04167, and that gives us the ideal knife edge positions for the hyperbolic primary mirror (or concave test plate for the secondary mirror with the appropriate multiplier to the parabola values). Telescope Equations Magnification of the Telescope Theory Size and Distance in the Sky. If not, a note to me on the ATM list will fix that problem when I get it. This is because the secondary's conic constant, Ks is a function of how far it is from the primary mirror and the distance to the focal plane. Magnification or power of a telescope is its ability to enlarge small objects from far distances. Distance of the focal plane 3 inches from the edge of the tube. The correction of a Cassegrain optical system with an aspheric secondary mirror (classical, R-C) is dependent on the primary-secondary distance. There are even some files for OSLO-LT (usable in the EDU version as the EDU version is an upgrade and it reads files from earlier versions) that show examples of finding the necessary Conic Constants and other such necessary specifications for the secondary. The secondary mirror in a classical Cassegrain is a convex mirror with a hyperbolic shape. Physics - Formulas - Telescope Magnification: A common question when purchasing a telescope is what "power" it is. After you choose a magnification, ... You should be able to now calculate the necessary dimensions for your Cassegrain telescope from the above example. How Much Power is Enough? Calculate K values for the mirrors in your Cassegrain. This gives f-ratio (f#) and plate scale The final focal length is fpm where m = magnification produced by the secondary. fp is the primary focal length. Thankfully, the formulas are already worked out in Richard Buchroeder's article mentioned above - he has provided a convenient table, and I have merely substituted the variable names I have been previously used here. m = 1 for flat. (This assumes it is large enough to be moved and still intercept all of the light from the primary). Telescope Formulas, Common Telescope ... have become woven into the fabric of amateur astronomy. There are several important factors to consider with telescope magnification: magnification, true field, apparent field, exit pupil, and resolution. Full-aperture meniscus corrector can be also used in various arrangements, including two-mirror systems, as described in Maksutov's extensive writings between 1941 and 1946. Most of these equations are from Texereau, another is from another source. 1", asphereic shape, eccentricity, Conic Constant and so forth. %%EOF This feature can be manipulated using different combinations of objective and eyepiece lens.

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