At 08:31 PM 1/14/2004, Willem-Jan Markerink wrote: >Overlooked the rather interesting exposure spec's on >http://www.irdigital.net/ : 200ASA, 1/[EMAIL PROTECTED] >(hmm....that's conflicting, with 200ASA SunnySixteen says 1/[EMAIL PROTECTED], >or almost 1/[EMAIL PROTECTED] cq a true 1/[EMAIL PROTECTED]). >... >Which means that regardless of whether D30 or D60 *can* record IR, >there is still a very strong IR-block filter inside...
I don't think so. In fact, it means the opposite! The camera modification inserts a strong IR-only filter inside that blocks out normal (non-IR) light. Let's assume that IR makes up 25% of the wavelength spectrum that the chip is sensitive to. Block the non-IR light means 75% less light. This is equivalent to putting a 2-stop ND filter in front of the lens. Thus, to record only IR light, you must use longer exposure times. And, like Peter K. says, Sunny16 is more of a guideline rather than a rule, especially the farther you move from the equator. So, that's also another factor, albeit minor. * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
