NightWatch: A Practical Guide to Viewing the Universe - 5th Edition 3 mm Eyepieces Image focus is achieved by

Image focus is achieved by sliding the eyepiece in the diagonal

it contains preprogrammed parameters

25" astro-filters

Antares 32mm Erfle Eyepiece - 2" Specifications

which is the most common eyepiece diameter for microscopes

NightWatch: A Practical Guide to Viewing the Universe - 5th Edition 3 mm Eyepieces Image focus is achieved byFirefly Books NightWatch: A Practical Guide to Viewing the Universe Popular Book "NightWatch" Revised Fifth Edition of the original Updated for use through 2035 The famous charts, ideal for stargazers using a small telescope or binoculars A complete update of the equipment section, including computerized telescopes An enlarged photography section, including how to instructions for using new generation digital cameras for astrophotography Working both