By Stephen Tonkin
This booklet presents an advent to the layout of a number of telescopes, mounts, and drives compatible for the home-constructor. initiatives contain tools that variety from a shoestring funds to professional units that aren't commercially on hand. The ability point of every undertaking is indicated and suggestion is equipped as to what's good to build, given what's commercially to be had. tricks and guidance are integrated, in addition to listings of respected mail order assets of fabrics and elements.
Read Online or Download Amateur Telescope Making (The Patrick Moore Practical Astronomy Series) PDF
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Extra info for Amateur Telescope Making (The Patrick Moore Practical Astronomy Series)
Astigmatism is avoidable in thin mirrors and I will redouble my efforts to eliminate it in the future. In hindsight, I believe the astigmatism was detected in the Ross Null test used in the Ronchi mode. 1 had difficulty in setting the test up in the Ronchi mode. The lines would spread out slightly at the bottom. I was able to set up the test with a slit and had no trouble using it to null the mirror. However, rather than blaming the mirror for my perceived difficulty in Ross Null Ronchi testing, I foolishly blamed the test for being inherently difficult to set up.
5 systems. that is slightly dimmer, but, more seriously, one with reduced contrast. The amount of degradation depends upon the size of the obstruction - the larger the obstruction, the worse the effects. Beyond this simple truth, there is little agreement as to the extent of the harm. Some claim that obstructions smaller than 30% the diameter of the primary mirror inflict image damage that is barely noticeable, while others maintain that any obstruction at all is unacceptable. Most experts however, agree that if the secondary mirror's minor axis is less than 15% of the diameter of the primary mirror then the harmful effects all but vanish.
The prism is visible Collimation My collimating tool is a plastic 35 mm film can in which I have drilled two 2 mm holes, one each in the dead centre of the base and the lid. I have found that the easiest way to collimate a refractor is to do so in two stages. First, remove the objective and tape a cross-"hair" of string across the "big end" of the tube. The film can goes into the focuser and the focuser end of the telescope is waggled until the cross is visible through the holes in the can. Then mark the soil pipe through the holes in the pan reducer and drill bolt holes in the former.