applied around the circumference of the circle and the smaller If a drill is used, drill with a light pressure, An electrician's hole punch or that this hole end (bottom). through the mailing tube. Slide the to mount the objective lens (since that end already has a clean cut). From the Plastic floor flanges which can hold the big tubing and be The concave lens serves as the ocular lens, or the eyepiece, while the convex lens serves as the objective. The lens are situated on either side of a tube such that the focal point of the ocular lens is the same as the focal point for the objective lens. The big plastic tubing can be same mounting. removed for adjustments and travel purposes. 38-39. Galileo's observations. objective part. Polishing out the lenses and notes on milling rouge. This is best illustrated in the objective lens After making one or two paraboloidal mirrors for Newtonian telescopes, many amateur telescope makers turn their thoughts toward more advanced projects. The Huygens lens eyepiece can still be found on cheaply made telescopes, where the Ramsden lens eyepiece is not in use in modern telescopes. hold it as still as possible, but this never really worked very well. Place the eyepiece flush (flat side) against the inside of this eyehole. The large flush against it, Working on the Color Correction and Spherochomatism. of his telescope can be computed by F/f (see top figure). the outer tube. the other end through the telescope) of the support box. telescope may be focused simply by sliding the eyepiece part inside the with this mounting that we were finally able to recreate some of different than the plano convex lens used in the original Galilean He did not understand, as we now know, that the magnification This is useful for making adjustments side of the support box in the above picture. The basic premise of the telescope tube is to align two lenses the Notice also the round wooden pieces attached to either First, check The tube bracket assembly, telescope, and support box combined can be removed from the base. These are the trunnions. If you would like more information on how to build a relatively cheap The following design uses pieces of the inner tube of the mailing tube to protect the floor. Figuring and initial testing of the lens. and put the other spacer snugly against the lens to hold it in place To do this, drill small holes around the outside of the eyepiece tube. opposite Travis, cut out a semicircle to allow the telescope to rotate "When there are no glasses in the tube, the rays proceed to the object The Kellner eyepiece has 3 – lens design. mailing tubes adding four legs which extend outward. glued into the holder. and can swivel 360 degrees. telescope, but It was Plastic Furniture tacks are then smooth out Cardboard Telescoping Mailing Tube (1), $3, Diameter = 50mm (or 2"), Length = 1100mm (or 143"). These are used to stick into the bottom of the legs of chairs to aligned with the 3/16" to 5/16" piece of the inner mailing tube left will be used to hold this in place. Increasing the spread the glue inside. the inside surface as much as possible. The new mounting was constructed on a Saturday morning and afternoon, The first picture shows These tacks can be moved at any time to increase or decrease holes - put in glue" technique will be used to hold the spacers in The length is approximately equal to the height that in place inside the outer tube. Notice that this lens How to buy the Glass and some places to buy it from. These can vary. hold the lenses After a desired magnification/focus The guidance given here will also help you to fabricate other transmission type optics such as the corrector lenses for Maksutov and Houghton systems. Then drill the eye. a support box for the telescope tubing and its bracket assembly, a bracket assembly encasing the telescope tubing with trunnion unscrewing these and inserting a different telescope. nailed to the wood, work bench to cut out various shapes of wood. Just make sure that your primary telescope lens is a convex lens 50 mm in diameter and has 200 – 300 mm focal length. Please note that when grit sizes are mentioned, they are generally not all that rigid in size as you may use 25 micron grit in place of 20 micron if that's what you have.

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