Save nearly $30 on a Celestron Travel Scope 70 telescope that features fully coated glass optics, a 70mm aperture, a 400mm focal length, correctly oriented views and a backpack for you to ...

DAVIDSON AND CO. have recently produced a “micro-telescope,” an instrument which is essentially a microscope of ordinary construction carrying a short ... 51/2 in. focal length, instead ...

Explore the night sky with the best telescopes to suit every budget and experience level, perfect for observing February's snow moon and spectacular planetary parade. February is a great time to ...

116, No. 817 (March 2004), pp. 266-000277 (12 pages) ABSTRACT We discuss the system requirements for obtaining millimagnitude photometric precision over a wide field using small‐aperture, short focal ...