110 Things to See With a Telescope - The World's Most Famous Stargazing List 2" Eyepieces A fine optical polish and

A fine optical polish and 2 mm thick glass allows the Baader Bright Blue Filter to be inserted anywhere into the optical path without introducing astigmatism or other defects

Lens Type:  Apochromatic Triplet Prime LensFocal Length:  540mmAperture:  91mmFocal Ratio:  f/5

Celestron CPC Deluxe 1100 HD Computerized Telescope Features

William Optics Vixen Style Mounting Base

Adjustable

110 Things to See With a Telescope - The World's Most Famous Stargazing List 2" Eyepieces A fine optical polish andA telescope and a copy of this book are all you need to find, view, and record your observations of the most popular stargazing targets. But what makes this list so famous? Over 200 years ago, the French comet hunter Charles Messier published a list of fuzzy, comet like objects he saw through his telescope. To him, they were a nuisance. We now know them as star clusters, nebulae, and galaxies! Modern astronomers later expanded his list from 103 to 110