kevin cook - stratford upo Posted October 13, 2006 Share Posted October 13, 2006 Am I missing something? I took a shot last week shutter priority 1/200, with flash in a darkish church.Lens 28/135mm 3.5/5.6The system chose f29! Meaning a too low an exposure. It did it outside also on two occasions!The flash fired compulsory. Why would it choose f29? Help? Kevin Link to comment Share on other sites More sharing options...
bobatkins Posted October 13, 2006 Share Posted October 13, 2006 Because the EOS flash system works very badly indeed in shutter priority mode. Indeed it hardy works at all and is the worst possible choice. I don't know the technical reason why this is. There's no reason to use shutter priority. You are MUCH better off in Program, Aperture Priority and Manual. Link to comment Share on other sites More sharing options...
kevin cook - stratford upo Posted October 13, 2006 Author Share Posted October 13, 2006 Except it tends to choose too low a speed at times for handheld work. My 20D has no problems at all in that area. I don't like shooting less than 125, so I could meter to that in manual, I just don't understand why the 5D does this. Link to comment Share on other sites More sharing options...
bobatkins Posted October 13, 2006 Share Posted October 13, 2006 They all do it, not just the 5D. If you want to set your shutter speed for some reason, you have to use manual mode, or use aperture priority and select the aperture that gives you the shutter speed that you want. Link to comment Share on other sites More sharing options...
j_robinson2 Posted October 13, 2006 Share Posted October 13, 2006 "There's no reason to use shutter priority. You are MUCH better off in Program, Aperture Priority and Manual." Not if you want the higher shutter speed to help with what you are shooting, like sports. Link to comment Share on other sites More sharing options...
bobatkins Posted October 13, 2006 Share Posted October 13, 2006 Actually, let me take back my previous answers. I'm not quite sure what I was thinking of, but it shouldn't do this. I just tested my 30D with flash in Tv mode and it was OK. It should give correct ambient exposure. I do remember some sort of cautions about using Tv mode with autoflash, but now I'm not sure what they are! I'll see if I can find what I'm thinking of in my Canon flash files. Link to comment Share on other sites More sharing options...
kevin cook - stratford upo Posted October 13, 2006 Author Share Posted October 13, 2006 Two images taken within fractions of a second. Flash 1 the flash fired for fill in but the camera chose f22. Flash2 the flash did not fire and the camera chose f4. Usually the cameras does not do this so I must have had a setting wrong.<div></div> Link to comment Share on other sites More sharing options...
kevin cook - stratford upo Posted October 13, 2006 Author Share Posted October 13, 2006 Next<div></div> Link to comment Share on other sites More sharing options...
kevin cook - stratford upo Posted October 13, 2006 Author Share Posted October 13, 2006 This was again ahutter priority 200s. A fraction of a second later the first was at f6.3 and for the second the 5D chose f9, without me moving a muscle or anything else for that matter, how inaccurate is that? Or am I evaluating incorrectly for such a scene?<div></div> Link to comment Share on other sites More sharing options...
kevin cook - stratford upo Posted October 13, 2006 Author Share Posted October 13, 2006 Pic 2<div></div> Link to comment Share on other sites More sharing options...
picturesque Posted October 13, 2006 Share Posted October 13, 2006 What flash is it? If it is a Canon EX flash, something is wrong. If you are using a Metz flash with the 3102 M3 module, in auto thyristor mode, the f22 behavior is normal when using TV. The second set of pictures is due to the whims of automated matrix flash metering. Link to comment Share on other sites More sharing options...
jon_austin Posted October 13, 2006 Share Posted October 13, 2006 J Robinson: "'There's no reason to use shutter priority. You are MUCH better off in Program, Aperture Priority and Manual.' Not if you want the higher shutter speed to help with what you are shooting, like sports." Err, maybe I'm missing something, but you can set as high a shutter speed as you want (within the camera's specs) in Manual mode. Kevin: Since you posted examples where presumably you did not change the camera settings between two sequential shots, yet the flash did not fire on the first but did fire on the second, does this mean you were in Program mode? If I'm using flash, I want to *know* whether or not the flash will fire. I therefore only use flash in Manual mode (where the flash is the main illumination) or Av mode (where the flash is used for fill). Personally, I never use Tv mode, since I want to know what the aperture value will be, and control it. If I need to specify the shutter speed, I'll switch to Manual, set both the shutter speed and aperture, and adjust either exposure compensation or ISO (or both) to get a good exposure. Link to comment Share on other sites More sharing options...
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