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ATM Light traps for Dobsonians



Hi everyone !
 
Does anyone know what design criteria (Dimensions, light trap depht, etc.) should be taken to build a light trap located on the opposite side of the secondary mirror as seen from the focuser, like the one described in January 2001 S&T's article "Stray Light in Telescopes" by Harold Suiter ?.  Thanks !
 
Best regards,

Mario Ortiz Dávila
newt145@intelnet.net.gt