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Summer Triangle Challenge

Video: Limiting Magnitude in Astrophotography Systems

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This video presentation examines multiple factors affecting Astrophotography System sensitivity (i.e. the Limiting Magnitude), and see how much they individually contribute to overall system degradation (actual data in magnitudes).

The presentation quantifies the dependence on Aperture, OTA type, Optics Coatings, Camera QE (with imager comparisons), Seeing, Light pollution, Extinction…



This is a must see for all astrophotographers, beginners and experienced alike.

PDF of this presentation and other goodies are available from:


~Chris K.

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