If you do your own printing, then the LunaPro SBC with the LAB attachment is very useful for estimating the initial exposure - since I've started using it I've significantly reduced the number of test strips I use as the meter reading allows me to get close to the correct exposure and also estimate the paper grade and additional exposure required for a burn. I've also used it to measure the reprocity failure curve of Delta 100 (which is quite different from the one published in the datasheet) and plan to measure the HD curve as well.
As well as all this it gives you incident metering, and better low-light sensitivity than most DSLRs (mine will only meter to 0 EV at ISO 100 while the SBC goes to -4). So keep the SBC. (And the spotmeter, for critical exposures).
Last edited by andrew.roos; 12-19-2012 at 03:56 AM. Click to view previous post history.