Making A Refractor Telescope | Norman Remer Pdf 12 New

Since its publication in 2006 by Willmann-Bell, this book has become a staple for DIY astronomers.

Detailed methods for testing the lens's accuracy and making corrections.

For community members searching for resources like the , this complete guide breaks down the core structural chapters of the text, its innovative engineering methodologies, and the lasting influence this work has on modern Amateur Telescope Making (ATM) communities. The Optical Philosophy: Why Build a Refractor?

: Flat or shallow concave back surface of the Flint lens. 3. Polishing and Testing making a refractor telescope norman remer pdf 12 new

While a classic, small-aperture starter telescope might use a modest 60mm lens configuration, custom ATMs often scale up to larger, custom dimensions like a or a 6-inch (152mm) f/15 configuration . Design Parameter 5-Inch (127mm) f/12 Achromat 6-Inch (152mm) f/15 Classic Primary Use Case Planetary/Double Star Tracking High-Resolution Lunar Observation Focal Length Glass Combination Ohara BSM51 / TIM2 (or Schott BK7 / SF1) N-BK7 / N-SF1 Color Control Good balance of length and correction Exceptional chromatic correction Tube Portability Manageable for medium equatorial mounts Requires heavy, fixed pier/tripod Step-by-Step Optical Fabrication Process 1. Sourcing Blanks and Grinding Tools

This write-up outlines the process for designing and building a classic achromatic refractor telescope (12-inch objective, “new” implying modern materials/techniques), inspired by traditional guides such as Norman Remer’s practical manuals. It covers goals, optical design choices, parts and materials, mechanical construction, alignment and testing, and suggested improvements. Assumptions: budget-conscious amateur builder aiming for a large, high-quality visual/astrophotography refractor using contemporary glass, coatings, and fabrication methods.

Despite the extra surfaces, the refractor offers significant advantages: Since its publication in 2006 by Willmann-Bell, this

While beginner-friendly in its "step-by-step" approach, experts at Stellafane suggest it may not be the ideal first book for absolute beginners without some prior optical knowledge.

Parts Sourcing & Alternatives

For a DIY refractor, an f/12 to f/15 ratio is ideal. Long focal lengths significantly reduce chromatic aberration (the "purple fringe" around bright objects). The Optical Philosophy: Why Build a Refractor

Once the glass is fine-ground and free of scratches, it is polished using cerium oxide on a custom-poured polyurethane or resin pitch lap. "Figuring" is the ultra-delicate zone of construction where tiny, microscopic imperfections are systematically polished out to ensure light waves converge perfectly at the focal plane. 4. Optical Testing

: Establish a dark, thermally stable room of at least twice your intended focal length to set up your testing benches.