I can tell you now - in spot mode it does the basics of spot metering as well as any other spot meter. It's 1 degree. For ambient, you push the button, and you get an ambient reading. What I find fantastic, is that you can take an ambient reading, store it into memory, and then use either the ambient to take another reading and it will show you the difference in stops between both readings. This is nice for those that use BTZS. Or, you can then take a spot reading, with the ambient still stored in the memory, and it will tell you both on the main display and in the viewfinder for the spot meter, the difference between the spot reading and the stored ambient reading. Really usefull feature for me. Or, store the spot reading, and take an ambient to see the difference.