the larger, heavier, more delicate, more precise and less expensive Pentax Spotmeter V which uses an analog needle on a scale. They have the same accuracy, which is pretty much perfect. I have two analog and one digital spot meter and they all agree with each other. That's very unusual. Most meters never agree with each other. The Digital meter used to be sold here and the analog meter used to be sold here. I bought all three of mine used in the 1990s and they've all worked perfectly for years.
You have to use the Zone System (page 69) with a spot meter.
The Pentax Digital Spot V (analog) takes three S76 or A76 or 357 or LR44 etc. button cells. You can get these at Radio shack and every grocery store.
The Pentax Digital Spot takes an A544 or 4LR44 or L544 battery, 6 volts. You can pay $10 at the camera store, or $2.33 at Home Depot in the garage door opener department. The 544 is actually four of the above cells in a single case.
The orange mark on the shutter speed scale is 1/50 second, which you use in Hollywood for movies shot at 24 FPS with a 180 degree shutter. 180/360 times 1/24 = 1/48, close enough to 1/50.
The weirdest scale is the IRE scale that goes to 100. IRE stands for the Institute of Radio Engineers (!) who defined the scale back at the dawn of television in the 1930s and it is used to this day in video and television to measure the equivalent of the zone system. It is the scale over which you paste your zone system sticker. IREs go from 0 (black) through 50 (gray) to 100 (peak white). Why radio engineers? Simple: that's who invented TV back then. You couldn't have had TV engineers before TV was invented, could you?
There are other bigger, more complex and more expensive meters like the Sekonic, Minolta and Gossens. I find these too big and complex. In the zone system it's easiest to do everything on a simple linear scale, which you just draw or stick on the Pentax meters' dials. The more complex meters lack scales and try to do everything in their own internal computer. Good luck figuring them out; I never have and you probably won't either.
The Zone System is simple when you learn it. A complex meter only ensures you never will. The Pentaxes make it simple.
USING A CAMERA METER AS AN EXTERNAL METER (page 87)A2/8 How to Use Histograms
INTRODUCTION
The best way to evaluate exposure is to look at the picture, not a histogram.
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