Archived posting to the Leica Users Group, 2006/09/20
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Mark Davison has the best explaination - it's an interaction between the camera's built-in metering and the after-the-fact metering that the histogram (hopefully the RGB histogram) gives you. Ultimately it's the captured image that informs how you shoot, right? So there are two systems working FOR you on a digital camera: BEFORE the shot you have the camera's built-in exposure metering system. It can be simple or quite advanced - but however it works it's a best-estimate approximation of what the camera vendor THINKS, SUSPECTS, IMAGINES will be what you want. AFTER the shot you have the histogram produced by the camera that shows you a representation of the image as recorded by the sensor. It's what's REALLY THERE and, ultimately it can be the final arbiter of exposure if you have time to use it. On my camera over-exposed areas show up flashing. I don't know how the DMR or M8 show these blown highlights. But the histogram is the key and using the data there we're free to adjust the exposure so what is captured exploits the dynamic range the camera is capable of recording. Doug has learned what he needs to adjust so for him the camera's metering more closely approximates what is captured. B D has his own system for doing same and I have another since I'm using a different camera body. Henning will probably have a different adjustment for the M8 and Ted today will be out there snapping in full auto mode and still making great images. Ain't technology wonderful? And Mark, thanks for the post, I learned something and you clarified something in my mind that hadn't quite jelled after a year! Adam