Numerical Aperture vs Magnification: True Resolution
Understand numerical aperture, resolution limits, and magnification. Learn Abbe vs Rayleigh, condenser NA, sampling, DOF, and practical rules for sharper images.

Guides to help with your Stargazing Adventure

Information on Galaxies, Stars, Constellations, Planets, Moons, Comets and Asteroids
Listen to Bernard Miller describe his journey into AstroPhotography and detail how he captured this stunning image of the Sculptor Galaxy.
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Drew Evans talks about his passion for astrophotography, the equipment used and tips for post processing image data.
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Hear D.j Van Bourgondien as he talks about using his Celestron EdgeHD 8″ telescope to capture this image of the Fireworks Galaxy
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Below are a selection of our Articles, to find more click on one of the sections above, or use the Menu at the top of the page.
Understand numerical aperture, resolution limits, and magnification. Learn Abbe vs Rayleigh, condenser NA, sampling, DOF, and practical rules for sharper images.
Learn how to choose, set up, and use a Dobsonian telescope. Aperture, eyepieces, collimation, light pollution tips, and realistic observing targets.
Explore double stars: types, orbits, mass measurements, and how to observe tight binaries with small telescopes. Catalogs, techniques, and famous targets.