nichols Posted February 1, 2006 Share Posted February 1, 2006 Does a Speedlite EZ flash work with the 20d? Link to comment Share on other sites More sharing options...
andy_van_eynde Posted February 1, 2006 Share Posted February 1, 2006 Long awnser, read this : http://photonotes.org/articles/eos-flash/ Link to comment Share on other sites More sharing options...
andy_van_eynde Posted February 1, 2006 Share Posted February 1, 2006 http://www.kjsl.com/%7Edave/speedlites.html Link to comment Share on other sites More sharing options...
andy_van_eynde Posted February 1, 2006 Share Posted February 1, 2006 As far as I understand it. An EZ can be used on a 20d. But the EZ series do not support ETTL! From "Flash metering systems used by Canon EOS." out of that first link : - EZ supports TTL and A-TTL - EX units support TTL and E-TTL (and E-TTL II) So on a 20d it can only be used in TTL mode! E-TTL II: Introduced in 2004 with the EOS 1D mark II digital camera and the EOS Elan 7N/EOS 30V/7S film camera, E-TTL II is an improved version of regular E-TTL which includes two key innovations. Improved flash metering algorithms. First, E-TTL II examines all evaluative metering zones both before and after the E-TTL preflash goes off. Those areas with relatively small changes in brightness are then weighted for flash metering. This is done to avoid the common E-TTL problem of highly reflective materials causing specular highlights in a flash-illuminated image and throwing off the flash metering. Normally E-TTL II uses evaluative algorithms for its flash metering, but the EOS 1D mark II has a new custom function (CF 14-1) that lets you use centre-weighted averaging rather than evaluative metering for flash metering if you prefer. Distance data incorporated into some calculations. Second, E-TTL II can use distance data when it�s available. Many EF lenses (see list in next section) contain rotary encoders that can detect the current focus distance. For example, if your camera is focussed on an object 4 metres away then the lens will send this approximate focus distance data to the camera body. Under certain conditions the distance data is factored into the calculations for determining proper flash output. This is particularly useful if you use the focus and recompose method without setting FEL - the new system can help minimize flash metering errors under these conditions. Canon describe the new system as essentially metering flash data across a flat plane rather than a point. Up until now distance data hasn�t really been used much by EOS cameras. Some PIC (icon modes) apparently incorporate distance data into their exposure calculations, but that�s really been about it. E-TTL II is the first really useful application of this information that Canon have implemented, and is obviously very similar to the fashion in which Nikon have long relied on distance data for their flash metering system. Link to comment Share on other sites More sharing options...
bill_muth Posted February 1, 2006 Share Posted February 1, 2006 Short answer: No Not quote as short answer: Yes, but it will only output a fixed blast of light. You may be able to switch to manual or Av mode and set an aperture that will give you correct exposure, but there is absolutely no automation. The 20D (and all Canon digital SLRs) do no support TTL, only E-TTL(II) Link to comment Share on other sites More sharing options...
awindsor Posted February 1, 2006 Share Posted February 1, 2006 No Canon DSLR support TTL mode. You can use the flash but only as a manual flash. This is a serious limitation and you would be better off with either an EX flash or an auto flash like the various Sunpak, Vivitar, and Metz models. Link to comment Share on other sites More sharing options...
wordsandpixels Posted February 1, 2006 Share Posted February 1, 2006 Had the same answer as Andy, but not nearly as erudite. Go for the TTL II series -- it's worth it! Link to comment Share on other sites More sharing options...
jim_simon6 Posted February 1, 2006 Share Posted February 1, 2006 If EZ series flashes worked with 20d in TTL mode, I would be a very happy person. Unfortunately they do not. EZ flashes work with 20d in full manual mode only. Mnaual mode can be adjusted (on 540ez at least) in full stops from full power down to 1/128th. Using the LCD and histogram and fine-tuning by adjusting aperture, you can make this combination work, but it isn't very convenient. If you already own an EZ flash, it's workable until you can save up for an EX series. If you don't own a flash yet, make sure you get an EX flash and save yourself alot of trouble. Jim Link to comment Share on other sites More sharing options...
steve_dunn2 Posted February 2, 2006 Share Posted February 2, 2006 <cite>No Canon DSLR support TTL mode</cite> <p>That should be no <em>recent</em> Canon DSLR. The really old ones, the ones which were sold as different model numbers under both Canon and Kodak names, do.</p> Link to comment Share on other sites More sharing options...
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