Telescope common aperture size comparison chart - Beginners Forum (No Astrophotography) - Cloudy Nights
astronomical optics, part 3: the astronomical image
Tele Vue Optics: The Majesty Factor
Astro Tutorial #1.6: THE F-RATIO "fast" vs "slow" scopes - YouTube
Bintel Astronomy Setup Calculator - Bintel
Light Vortex Astronomy - Article: How to Very Accurately Calculate your Telescope's Effective Focal Length
Formula to estimate exposure from aperture & F ratio - Beginning Deep Sky Imaging - Cloudy Nights
astronomical optics, part 2: telescope & eyepiece combined
How to Calculate the Field of View of Your Telescope - StarLust
astronomical optics, part 3: the astronomical image
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Newtonian Reflecting Telescope Designer
How to Choose Your Telescope Magnification - Sky & Telescope - Sky & Telescope
Refractor Baffle Calculator - ATM, Optics and DIY Forum - Cloudy Nights
Astronomy Tools
How to Choose A Telescope for Astronomy | Types of Telescopes - Sky & Telescope
Telescope Magnification Calculator - Calculator Academy
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Can't save telescope aperture in Object calculator - APT Forum
Two-mirror telescopes: Cassegrain, Gregorian and variants
Calculate the resolving power of a microscope if its numerical aperture is - YouTube
Telescope Magnification Calculator
Dome Calculation - the homepage of Nicolàs de Hilster, PhD
Telescope, CCD and Eyepiece Calculator - Deep Sky Watch
Simple Formulas for the Telescope Owner - Sky & Telescope - Sky & Telescope
