Making A Refractor Telescope Norman Remer Pdf 12 [top] Here

The answer lies in . A simple, doublet achromatic lens inherently brings red and blue light to different focal points. The standard cure is a long focal ratio. A modern f/5 achromat shows a purple halo around Jupiter. A classic f/12 or f/15 achromat virtually eliminates it.

: Includes detailed instructions on the Foucault and Ronchi tests for lenses. making a refractor telescope norman remer pdf 12

The book provides a step-by-step roadmap for fabricating a telescope from raw glass to a completed instrument. 1. Design and Glass Selection The answer lies in

Remer doesn’t just tell you how to build it; he tells you why it works. He dives into the specifics of the Fraunhofer doublet design. He explains how the curvature of the Crown glass front element and the Flint glass rear element must interact to cancel out chromatic aberration. He provides the mathematical formulas (and tables) required to calculate the radius of curvature needed for a specific lens diameter. A modern f/5 achromat shows a purple halo around Jupiter

If you have never ground a mirror before, do not start with a Remer refractor. Start with a 6" f/8 Newtonian. Then, after three years, attempt a 4" f/12 Remer-style refractor. Then, and only then, consider PDF 12.

Most commercial cells pinch the lens. Remer’s cell design (likely detailed in Fig. 12 of the PDF) uses three floating nylon-tipped set screws and a spring-loaded retaining ring. The lens must "float" on a felt gasket.