dmward
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 p.1 #1 · Cyber Commander Calibration | |
Received my Cyber Commander Thursday and today finally got a chance to do some quick familiarization and testing.
I've been using a Minolta V flash meter that I got used several years ago. And, as I describe on my tutorial site I've been fine tuning my exposures using a Color Checker.
So, I decided my first test would be to calibrate the Cyber Commander and Minolta, and then fine tune with color checker.
Set an AB800 up at full power 11 ft from test subject. Reading was F16 plus 6/10 (F20) at ISO 200. Shot a test image with 5DMII and 70-200 F2.8. Took the image into light room and adjusted exposure to get the white square to read ~93%. That took .6 with the exposure slider.
Used the Calibration feature on the CC to correct the .6. Did another reading, F16 plus 6/10 Made an exposure at F20 read the white square ~93%. So the meter is reading a true exposure plus or minus 1 tenth.
Used the power adjustment capability on the CC to reduce power by 1 stop, did a test, and repeated to F2.8. Took the images into Lightroom and measured the white squares. All read within 1.5% which is about half the Color Checker tolerance. Largest deviation required less than .25 move on the exposure slider in Lightroom to get a 93.5% reading which is the optimum.
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