On Sat, 25 Jul 2009 19:08 -0400, "John Graves" <[email protected]> wrote: > In reflecting on the feature, it seemed to me that something had to be > fixed, and so at the very minimum it would only work in the picture > modes, and probably in the Av and Ty modes, but I couldn't find a way to > do an in cameras test. Going into RAW processing I could see what ISO > level was used but I haven't done that as yet. > > Ah hah......After some reflection, I went out and set the ISO to Auto > and took a picture. If you bring the picture back to the screen for > review and hit the INFO button twice, the shot parameters are shown. In > this case it was ISO 800 and I was in Av mode. In flower mode, it set > the ISO to 1600 so it appears that the aperture and speed are set and > the AUTO ISO moves the ISO setting to make it happen. Interesting. I > can see why you would want to set a usable range of ISO speeds if you > were going to use this feature as it is not displayed in the eyepiece.
I just did a few test shots with the DS in Av mode. I couldn't get the camera to set an ISO higher than 800. There seems to be a built-in limiting ISO that is not able to be set by the user (unlike the K bodies) and, based on your tests, the limiting ISO might be different depending on the shooting mode set. Cheers Brian ++++++++++++++++++++++++++++++++++ Brian Walters Western Sydney Australia http://members.westnet.com.au/brianwal/SL/ > > John Graves > WA1JG > [email protected] > > Brian Walters wrote: > > On Sat, 25 Jul 2009 16:45 -0400, "John Graves" <[email protected]> > > wrote: > >> Auto ISO is one of the features added to my DS with the last update. I > >> switched it in this afternoon while taking more bird pictures. Aside > >> from the discovery that I am not as fast as a hummingbird, I could not > >> discern what AUTO ISO added to the picture equation. Is there a > >> discussion of this feature somewhere that explains what is is & how it > >> operates? For instance, does it start at the last set ISO level and > >> move up or down based on some ideal setting of aperture and speed. Does > >> it require that I select one of the "modes" to make it work. This > >> would be the most logical to me. Is this a feature I can ignore if not > >> with impunity at least with some peace of mind? > >> -- > > > > > > Actually I wasn't aware that "Auto" had been added to the *ist DS (my > > second camera), so thanks for posting. > > > > My understanding (and this could be completely wrong) is that Auto ISO > > allows the camera to adjust the ISO to suit the lighting conditions. > > So, if you were shooting in Av mode and set an aperture that would give > > a shutter speed too low for hand holding, the ISO would be increased to > > achieve an acceptable shutter speed (or as high a speed as possible). > > At least that's how it seems to work with the K200D. > > > > With the 200D (and I assume the other "K" series bodies), you can limit > > the range over which the camera is allowed to increase the ISO. That > > doesn't seem possible on the DS, so I assume (a lot of assumptions > > here!) that the camera can adjust the ISO right up to 3200 with the AUTO > > setting, if necessary. > > > > Cheers > > > > Brian > > > > ++++++++++++++++++++++++++++++++++ > > Brian Walters > > Western Sydney Australia > > http://members.westnet.com.au/brianwal/SL/ > > > > -- -- http://www.fastmail.fm - The professional email service -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
