I don't know the 5D2 but my Nikon D5000 refuses to provide a meter reading at a light level below EV 0 (at ISO 100). This is irrespective of the aperture and ISO settings - it's just the meter sensitivity threshold, so setting ISO 800 and f/1.4 won't help! I just gave 1 minute at f/8 as an example to illustrate what sort of light level this is as I quite often shoot in light levels like this (and then sometimes I find myself using the SBC to calculate the exposure for my DSLR!).
Originally Posted by rawhead
As for reciprocity failure - well if you shoot Delta 100 read the thread I've just posted - it's easy to calculate in your head with an error margin of not more than 1/3 stop out to at least 8 minutes (measured exposure, giving about 40 minutes actual exposure). Just add an additional 1/3 stop for every stop of metered exposure above 4 seconds.
Good luck with your decision,
Last edited by andrew.roos; 12-19-2012 at 06:09 AM. Click to view previous post history.