Question

(page 97) #6.) Small telescopes are often advertised as "200 power" or "magnifies 200 times." How would you improve such advertisements?

Answer 1

Magnification / in of objective would be an improvement

I seem to remember as 35X per inch of objective as useful

Also, in the case of reflectors (1/8 wave) is about the maximum tolerance allowed in a reflecting surface (mirror)

That means a mirror needs to be ground within 1/8 wave of perfection