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 - Access all of your messages and folders wherever you are -- 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.
