My recent experiments reveal that the magic numbers for Arista EDU Ultra VC RC on both my 4x5 tailboard and 8x10 field cameras was f/90 @ 2 seconds (unfiltered), or f/90 @ 4 seconds (2x yellow filter) during normal daylight (bright) conditions. Since I have no shutter on either of my cameras, I use the lens cap as my shutter. 2 seconds and 4 seconds are easy to regulate by hand. Even one second is feasible. Your iris probably won't go down to f/90. You can do the calculations there for f/45, f/32, f/22, etc; and come up with some workable exposures.
Last edited by anon12345; 04-13-2011 at 11:39 AM. Click to view previous post history.