Question about Pentax *ist DS Digital Camera

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Difference between Auto Picture/Program Mode

I am confused about the true difference between Auto Picture and Program Mode on the * Ist DS? Also it seems to me that in Auto the camera selects the exposure. In Program if you don’t select an exposure what happens? Thank you for your help

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Well, by now you have probably learned that the exposure of a picture is determined by aperture and shutter speed. For a correct exposure, there are a lot of combination of the two. For example, 1/250 sec and F8 equates 1/1000 sec and F4, or 1/4000 sec and F2. Shutter speed changes the motion blur; to stop a fast motion, you need faster shutter speed. Aperture changes the depth of field. For portrait, shallow DOF (small F number like 1.4, 2 or 2.8) is preferred to make the backgroud out of focus, for landscape, deep DOF is preferred to put everything in focus. With the picture program, the camera select all these depending on the scene you selected. With P, the camera set these, but you can adjust them to your like by turning the wheel. With Av and Tv modes, you actively select one of these values to suit your need (the camera sets the other value). One of the great advantage of the digital is that you can experiment all these and instantly see the results. Have fun!

Posted on Sep 08, 2005

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On the *ist-DS: P = Program Mode. *ist-DS sets shutter and aperture. Smiley = MTF Program / Auto-all. *ist-DS sets shutter and aperture following MTF tables for FA, DA and D-FA lenses. Also forces "bright" mode for Jpegs, and disables manual white balance. AutoPict mode (green mode): *ist-DS picks the "pictograph" mode automagically. It will choose between Landscape (distant shots), Portrait (Midrange) and Macro (Close) shots, setting aperture, shutter, WB, and so on by following MTF and other specialized algorithms for each type of shot. This mode won't shift into sport mode automatically (at least I can't seem to force it to do so). I use P and Av most of the time. I *wish* that the Smiley mode would leave WB and "Bright"/"Natural" modes alone. If it did, I would use it more. I have no use for the auto-pict modes, but some people like them.

Posted on Sep 08, 2005

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Auto Picture-selects on of the picture mode such as landscape(mountain), macro(flower), sport/action(running man) mode, etc. P-sets shutter and aperture. You set everything else. happy face- sets shutter, aperture and everything else.

Posted on Sep 08, 2005

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Looks like its true... Another major disadvantage. Removing TTL means removing one more hardware piece - TTL sensor. Pentax removed almost every nice feature, which needs some aditional or more expensive hardware: no TTL flash, less AF points, pentamirror... Seems like I bought Ds right in time.

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They will - fully open in Av mode, and with any aperture in manual mode - after you allow the Ds through the custom settings menu to use aperture settings different then "A". To choose correct exposure with such a lens in manual mode you can use the AE-button - it stops down the aperture, reads the EV and sets the shutter speed according to the chosen aperture.

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That is normal operation, if poped up, the flash fires rapidily in low light to assist the auto focus, on a plain white wall, it can't focus, see the manual on AUto Focus limitations.

Sep 08, 2005 | Pentax *ist DS Digital Camera

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