| Author | Message | ||
     dmr Rating: N/A |
I'll ask this here since I seem to get a resounding "I dunno" wherever I've asked it other places.  Is there a way, without resorting to super expensive laboratory grade standard light sources, to do a reasonably-accurate calibration or calibration check on a light meter, specifically those in manual cameras? In general, I've been given three answers: 1. Buy a (handheld) light meter and calibrate/check from that. Unless I buy a new or known calibrated one, same story, I don't know how accurate it is. 2. Check it under sunny-16 conditions. I'm hoping that I can get something closer to a known standard than this. I keep hearing that noonish sunlight on a clear day gives you consistently 80,000 - 100,000 lux, which is about EV 15 at ISO 100, etc. 3. Compare it with a camera that gives good exposures. This is what I have been doing, but it seems so un-scientific. The camera I used for a reference is a 20+ year old Pentax K1000 which does give consistently good exposures. I really have no clue how accurate this really is when compared to a standard. Any suggestions? Thanks in advance, gang. |