I find a digital readout on a meter slow to read. Much prefer an analog meter. Are you going to be in good light most of the time, w/ just an occasional foray into the indoors? Then I highly recommend a small and light Sekonic L-188. Very simple and clean interface, plenty accurate for what I described, and they go for about $25. Takes the ubiquitous and cheap 1.5V button batteries.
Are you going to be shooting in low light a lot? My go-to meter for that is a little bigger (but still considerably smaller than a Lunasix), a Gossen SBC Super Pilot w/ a silicon cell and again, a simple and quick-to-read layout. VERY accurate in low light....the best hand held meter I've ever owned. About the size of a pack of unfiltered Camels. I paid about $30 for mine. It has a bridge circuit so it works on both 1.35V and 1.5V button batteries.
Used to have a Sekonic L 308 meter and I hated it. Slow to read, and you had to point it while holding it upright like a Star Trek communicator. It attracted too much attention. A Pentax spot meter would be even worse in that regard. Like JP said, if you can get an accurate metered prism, that would be best perhaps. You're going to be carrying around a beast of a camera already, so think small and light to help on that issue.
Last edited by momus; 02-24-2014 at 01:16 PM. Click to view previous post history.