Originally Posted by fotoman65
I am wondering, since I have a nikon VR 2.8 70-200 lens, would I be able to just pre meter a spot at 2.8 and shoot from a distance on a ladder? Does this make sense? Im trying to get a crystal clear pic of the ladies walking (stop motion) and blur the background at the same time.
While that would certainly give you a shallow depth of field to help blur the background, it certainly wouldn't give you much margin for error - at 200mm on my Nikon, f2.8 gives me just a couple of inches depth of field, and that's not something I'd depend upon if the models were moving. Hell, even if the model is standing still, it's hard enough to get a sharp image of the face/eyes at 2.8!
Any suggestions on shutter speed? 125 perhaps???
Figure out what aperture you're going to need and allow the shutter speed to land where it lands.
BTW - what I might try doing is to let the light falloff from the strobes create a darker area behind the target zone of where the models will be - and not worry about blurring the background. With the zoom out towards max, there's also going to be some foreshortening of the image that will help bring out the model from the background. Here's an example, shot at 1/40 @ f14, where Isobel's perfectly viewable but the light falloff from the single strobe-into-an-umbrella on her left had enough falloff to keep the background a lot darker.
Imagine looking down the runway instead of the white wall (now dark grey) and the room behind her (now virtually without detail) and you can possibly see what I mean, yes?