cgardner Offline Image Upload: Off
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I just made the transition to the 50D from a 20D and while I have not done any direct side-by-side comparison I've been favorably impressed by the new acquisition. The resolution of the 20D still meets most of my needs, but I've been wanting a 2nd body / back-up and the bigger screen, improved feed back, micro-adjust and other user interface feature make it worth the price of the upgrade for me ($1,089 at B&H with the instant rebate).
I have AF lock set to * on the 20D so the AF-ON button was new to me. What I do on the 20D is lock AF with the * button, recompose, then half-press shutter to lock AE. I shoot with two flashes with Canon ETTL wireless most of the time. I don't use FEL, I just try to let Evaluate metering sort things out by locking ambient AE (in Av mode) with half-press of the shutter after recomposing, then fully press to fire pre-flash for the Evaluative metering process. I found with evaluative its better to just let the camera take its best baseline guess with flash at FEC=0, evaluate the results in the histogram / over-exposure warning, then correct from that baseline with +/- FEC.
After perusing the manual I have set Set AF-On via CF.n to option 3 which seems to do the same thing. With the "zero baseline" approach I use I find the 50D does a better job on flash exposure at FEC=0 than the 20D, but more systematic testing is required to confirm that objectively. FWIW, I've discovered the active AF point doesn't show in the playback after the function of the AF-ON button is changed via CF.n
I may switch the AF-ON and * buttons because I keep hitting * by mistake and getting a FEL burst I don't want. I don't use a grip so the button issue there is not a problem. Can the * button, if not swapped be reconfigured for other uses or turned off? I can't find a CF.n yet to do that.
Chuck
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