Numerical Aperture and Resolution in Light Microscopy
Understand numerical aperture, Abbe and Rayleigh limits, wavelength, sampling, and refractive index to make better resolution choices in optical microscopy.

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.
Read the full article here.
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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Understand numerical aperture, Abbe and Rayleigh limits, wavelength, sampling, and refractive index to make better resolution choices in optical microscopy.
Discover how space telescopes revolutionize our understanding of the universe.
Step-by-step deep-sky astrophotography workflow: planning, gear, exposure strategy, calibration, stacking, and processing for clean, colorful nebulae.