nick_wood Posted July 24, 2003 Share Posted July 24, 2003 Hi � My first question on this forum so please be gentle! A very specific question on the A-DEP mode used in the canon eos 10d which I am thinking of buying�. There are a few articles on the net on the differences between A-DEP and DEP modes (the latter I use pretty frequently on my current eos 50E). There are also a few articles on this forum but none seem to address my point exactly. I understand that A-DEP requires some framing luck to work properly as it is a one-step process and not a 3 step process. However, assuming that you are able to frame your near and far points to cover at least 2 of the 7 focussing points, does the camera then focus ~ 2/3 of the way from the distant to the near point (ie. hyperfocal distance) and then set the minimum aperture needed; OR does it use a less sophisticated focus setting rule before setting the minimum aperture? Also do you get the opportunity to see the chosen aperture value and thus set focus to manual (ie. Fix it) and then put the camera in AP mode to increase or decrease the DOF knowing the at the lens remains focussed at the correct distance between your near and far points? Cheers Nick. Link to comment Share on other sites More sharing options...
yadayadanoonecares Posted July 24, 2003 Share Posted July 24, 2003 IMHO, if you have a digital camera, about a week of experimenting with it (using the instant feedback) gives you enough 'feel', to use MF, and aperture priority so that you can outperform A-DEP. Again, thats just my opinion. I think it is more work and time-consuming to learn every inch of all the automation then it is to learn to use shutter and aperture, and once those two are understood thouroughly, it's much easier to understand & use the automated modes. Anyhow, that doesnt really help you and doesnt answer any of your questions, but just a thought. Link to comment Share on other sites More sharing options...
nick_wood Posted July 24, 2003 Author Share Posted July 24, 2003 Bart - Thanks for the comments - Hopefully someone will know how this camera responds so that if I buy it, I know how good it will perform on those days when my own technique lets me down!! Link to comment Share on other sites More sharing options...
bobatkins Posted July 24, 2003 Share Posted July 24, 2003 The ~2/3 distance is a less sophisticated "rule of thumb"! Actually what it uses (I assume) is the same algorithm used in all other EOS bodies with a DEP or A-DEP mode, which puts the focus point 7/17 ths of the way from the near to the far point. 7/17 is Canon's best guess of the split for subjects at "normal" distances, i.e. not closeup macro shots and not "everything including infinity" shots. <p> No Canon body does an actual detailed DOF calculation, they just use the 7/17 estimate. <p> The aperature and shutter speed information is displayed, so you can copy those setting to manual mode if you wish. <p> Here's a link to my website and a <a href="http://bobatkins.com/photography/eosfaq/eosfaq24/9miscellany.html#q27">more complete explanation</a> <p> And of course...if you do buy a 10D, please think about doing so using one of the vendors that support photo.net. If you use their links from the <a href="/">home page</a> photo.net gets a small credit which helps to keep this site running. Thanks. Link to comment Share on other sites More sharing options...
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