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Message: <blockquote data-quote="Boy George" data-source="post: 1195236" data-attributes="member: 14216">Cans of worms?Firstly, my thanks to Adrian (photovision) and Keith (Reeder) for your replies to my post about using all focus points and blurred backgrounds. I've yet to experiment, but am encouraged by your experiences.Now, turning to tdodd's eloquent exposé on manual exposure. On reading it the cogs started turning and I remembered that somewhere I have a Weston Mater V exposure meter with incident light cone. So this afternoon I dug it out and used it to test the theory. First, I set the ASA speed rating (which I know(?) equates to current ISO ratings), ascertained suitable shutter speed/aperture by both incident and relected light (almost exactly the same) and set them on my 20D. Then I tried some test shots of reasonably neutral subjects - brickwork and garden greenery. Results? Anything between 1 and 2 stops over-exposed as indicated on the camera scale and verified by blown highlights "flashing" in the image and of course, the histogram. Not sensible I thought - am I on the wrong track with ASA/ISO being the same? Checked that they are by research on the net and now back to square one! I do like the idea of "setting and forgetting" as tdodd says so what can be the problem, I ask? Incidentally, the lens in use is Canon 100-400 IS Zoom.Anyone have any views please?Adrian</blockquote>