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I have devised a laser collimation test for Cassegranian systems. An on axis laser beam falling onto a 3M type reflective film creates a “virtual pinhole.” The backscattered light is sufficient to form an adjacent image from the primary that may be adjusted until it is brought into coincidence with the “virtual pinhole. This collimates the primary and allows the secondary to be collimated by conventional process, similar to Newtonians.
A process is described, utilizing readily available resources, for the fabrication of super-lightweight graphite-epoxy thin-wall tube structures. The heart of the process is in the compression molding tooling, which yields smooth exterior surfaces, and in the breakaway mandrel that forms the inside wall.
Overall, The William Optics FLT 151 OTA is an impressive telescope with exemplary craftsmanship and excellent optical performance. I would highly recommend this telescope to anyone wanting a fine 6” refractor.
I had a set of Synta mirrors in storage which I had taken out of my Orion XT-6. I wanted to build a scope for them and after giving the project some thought I decided to build a strut Dob out of wood. The intended purpose of this scope would be for use at lower magnifications on deep sky objects. With a lot of miscellaneous stuff lying around, as well as access to a lot of scrap materials and discarded items, one of my goals became to build the scope as economically as possible while reclaiming and recycling as much as I could. The project would also be a good learning experience and an opportunity to try out different design ideas. The entire Dob was made with only a few old power tools and hand tools, as well as a small drill press and a Harbor Freight mini-lathe. I used a portable work bench I made to do all the wood cutting and sanding in my back yard. The rest of the work was done in my single car garage.
Top quality mirrors, strong ergonomics, a fantastic focuser, super light OTA and very quick and easy transportation and setup are the key benefits of this telescope.
Would I recommend this system? The answer is yes but make sure to purchase the scope from a reputable dealer who has the ability to check the scope out before shipping. This sometimes costs a bit more but is well worth it (I wish that I had done this).
A. Jaegers Optical Corporation--A personal recollection Stephen L. Nightingale For many teenagers in the 1960’s, an after-school or summer job meant...MacDonald’s! As a teenage amateur astronomer and telescope nut, I had the perfect job--working for Al Jaegers at A. Jaegers Optical Corporation from 1968 to 1970.