To fix this, Remer explains how to use two different types of glass mated together:
Remer’s approach provides clear advantages for home builders:
Some readers noted that while it is excellent for lens design and fabrication, they sought additional outside resources for advanced OTA (Optical Tube Assembly) construction details like baffle placement and complex mounts. Summary of Ratings Goodreads Goodreads Open Library Open Library making a refractor telescope norman remer pdf 12 new
It sounds like you are looking for a specific document: by Norman Remer , likely a PDF, and you’ve added the phrases “12 new” and “interesting essay.”
If you cannot find Remer's text, classic alternatives include Amateur Telescope Making by Albert G. Ingalls and Standard Handbook for Telescope Making by Neale E. Howard. To fix this, Remer explains how to use
2. Understanding the Refractor Design (The Doublet Achromat)
If you are diving deep into telescope making, it is highly recommended to pair Norman Remer's insights with other classic and modern texts: Howard
: Using optical tests to identify and fix errors in the lens figure.
Raw measurement is only the first step; the real magic happens in the testing phase. After polishing, the lens is installed in a temporary cell and mounted in a test rig to be pointed at an artificial star (a pinhole with a bright light behind it) or a real celestial target. Using a high-power eyepiece and a Ronchi screen or a knife-edge tester, the builder examines the star's diffraction pattern. This test reveals whether the lens is suffering from spherical aberration and zone errors. Based on the pattern, the builder returns to the polishing bench to apply targeted correction—altering the stroke pattern—a process known as "figuring." This iterative loop of test, analyze, and correct continues until the lens produces a textbook-perfect star test.
Once you find the PDF, here is why it’s considered an interesting essay rather than just a manual:
: A low-index, low-dispersion element that forms the positive, front-facing lens.
