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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schiefspiegler,60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4" f/12, 4.5" f/16 & 6" f/12 Schupmann Medial refractors, 4" Celestar, 19 Stellafane awards 9 in optics Engineering = Taking what you have and making what you need.
Quote:Then you place it in the focuser and be sure there is little or no play. Rotate the laser in the focuser and look at the spot on the lens, it shouldn't move.
Quote:"If the laser axis is offset and also slightly out of parallel from the axis of its holder, you can have the laser appear to be collimated at a certain distance."Thank you for pointing that out. It is an important point that is almost never considered in discussions here. I pay close attention to it.
Quote:Dave did say "first make sure the laser is collimated".
Quote:Quote:Dave did say "first make sure the laser is collimated".Of course. But how many people using a 1.25 inch laser check its collimation in their 2 inch adapter?
Quote:...In any case, my only point was that the use of a laser (like any collimation tool) requires careful consideration of the geometries involved. I daresay everyone involved in this conversation takes that as a given, so please consider the comment to have been directed at our silent audience