Post by larry on Aug 11, 2015 11:19:48 GMT
Hi alexr. The reason I start wide open with a high ISO is to make sure my DSLR's meter will be able to determine a shutter speed other than bulb. If the aperture and ISO setting require a shutter speed of more than 30 sec, my meter tells me to use bulb mode. But I want an initial exposure with 30 secs or less. When I have my initial aperture, ISO and shutter speed I can then adjust my aperture and ISO to what I really want and increase the shutter speed to maintain the original exposure value I got by metering.
Normally, as in outdoor/indoor photography where there is ample light, I first set the aperture to get the DOF I want and then I set the ISO to the lowest value I can while still having the shutter speed I need - to freeze motion or create motion blur.
One thing I forgot to mention in my earlier post is that, if I remember, I also turn off Image Stabilisation when using a tripod. IS is designed to look for camera motion and if there isn't any then IS actually looking for it could introduce a little movement/blurriness.
Normally, as in outdoor/indoor photography where there is ample light, I first set the aperture to get the DOF I want and then I set the ISO to the lowest value I can while still having the shutter speed I need - to freeze motion or create motion blur.
One thing I forgot to mention in my earlier post is that, if I remember, I also turn off Image Stabilisation when using a tripod. IS is designed to look for camera motion and if there isn't any then IS actually looking for it could introduce a little movement/blurriness.
