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Download Astronomical sketching : a step-by-step introduction by Richard Handy; et al PDF

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By Richard Handy; et al

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Extra info for Astronomical sketching : a step-by-step introduction

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There are many types of these fi lters available, such as fi lm, glass, and metal. Whichever you decide on, take care to purchase a fi lter that meets the manufacturer’s recommended specifications and only use the kind that connects firmly onto the opening of the optical tube assembly (OTA). The downfalls of sketching directly at the eyepiece are inadvertently sketching features larger than they actually are and/or slight misplacement of them. It is helpful to imagine a grid line on both the solar disk and on the sketched disk while applying features.

Carpentry pencil sharpener These plastic sharpeners can be purchased at hardware or lumber supply stores. They have wide openings that allow the flattened lead carpentry pencils to be easily sharpened to a point. I have noticed they are great for sharpening the Conté Crayon sticks as well. 1 • Masking Tape (2″ wide) • Sketch board If you use the full sheet of Strathmore paper as I do, a sketch board made of 1/8″-thick 24″ × 30″ Masonite, or press board, will allow you to position the paper and tape it down with room to spare for a hand hold.

The opposite will be true when the scope is moving south. I like to use this method since it is faster than watching for drift, especially in low-power views. Once one direction has been indicated, you can automatically fi ll in the others if you know how your telescope handles an image. Telescopes with an even number of mirrors or no mirrors at all, such as Newtonians and refractors without mirror diagonals, will present “right-reading” views. A right-reading view may be rotated in any direction, but is otherwise normal.

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