> > Chip Louie wrote: > > > > Hey All, > > > > This is getting silly! DEP cannot work if you are busy mucking up the > > exposure! The whole point of DEP mode is to use the camera's > processor to > > set the aperture for the DOF you want, if you change the f/stop > DEP cannot > > work, if you change the shutter speed your exposure will more > than likely be > > off. If you need to adjust the exposure use exposure compensation. > > Shifting the exposure in (P)rogram mode allows you to change > the shutter or > > aperture values but the EV remains the SAME! How can shifting > the exposure > > work in DEP mode? It can't! > > Hey Chip, > > actually, it CAN work with program shift. Let me explain WHY I would very > much like to have this possibility, which is available with the > lower level > bodies like 5, 100 etc anyway. Well, here goes. DOF is not an > absolute thing. > It depends on the size of the circle of confusion (CoC) that you use to > calculate it. Now, DEP mode assumes a certain CoC size, which is around > 0.035mm AFAIK. For my taste, that's too big! I'd prefer to use 0.025mm. > And that's where program shift in DEP mode, AFTER the camera has done its > thing, would come in handy. Shifting the exposure values to stop down the > aperture one stop (and increase exposure time accordingly) would decrease > the CoC size by a factor of 1.4, making it about 0.025mm. So if they won't > give me a DEP mode with directly adjustable CoC size, why not at least > allow me to adjust it manually afterwards? I'll do it anyway, but > I have to > change modes do it. It would just make my life a little easier > and it won't > hurt anybody if the DEP program is shiftable. > > Thomas Bantel >
Hi Thomas, I think most of the confusion is coming from people using the term "shift." When using the term "shift" in relationship to exposure, Canon's documentation (what little there is of it anyway), generally uses the term to describe altering the one or both exposure settings while retaining the same EV. What you wish to do has a similar, but narrow effect on exposure settings to achieve your purpose so I can see how you might call it a "shift." But really it's not so much a "shift" as an adjustment in the value of the CoC you want. It would be cool if they had a DEP mode CoC selection as a custom function. It would be easy to make the change in firmware but I doubt many photographers would make use of this option. Maybe someone at Canon could make this change and offer it as a perm ant change option for the EOS firmware or add it as a single custom function. I've never found myself wanting to alter the settings that DEP had selected after seeing the results on film. But this probably had something to do with the way I use DEP mode, infrequently, and the fact that I found that I could get better results by simply expanding the zone that I want to keep in sharp focus. This is effectively the same thing as what you are trying to do, if possibly slightly less precise than having the camera perform the calculation but takes no additional steps or adjustments in practical shooting. When I bought EOS 1n bodies several years ago (to replace the EOS 5QD bodies), I never made any changes in my DEP mode shooting and saw no differences in the results of DEP mode use because I had already changed the way I used DEP's AF points. Regards, Chip Louie * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
