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A few attempts to clarify some mysteries about flash and digital photography basics, hopefully helpful.
It is Nikon-specific, however almost all subjects are general, not affected by brand at all.
4. Flash pictures are Double Exposures (including Fill Flash in Sunlight)
Review of the Yongnuo YN-565EX Speedlight A less expensive alternative
Comparisons of Optical Slave Triggers (for the SB-600 too)
How Light Meters Work (maybe not as assumed)
Details about Metering Principles (including TTL)
A Histogram is Not a Light Meter Incident meters vs. Reflected meters
Do I need a handheld light meter? Including Sekonic L308S
There are TWO types of Histograms The Common Histogram is Poor
Histograms are Gamma Encoded The numbers are probably not what you think
Nikon TTL BL with D Lens Distance Zoom lens distance accuracy is rather suspect
Nikon CLS Commander Wireless Remote Flash System (AWL), also including:
F/stops, in tenth-stops f/stop, shutter speed, ISO, in third and half stops
Diffraction Limited Images Really?
Memory Card Speed How much do we need?
Photo Editor Curve Tool (and levels and contrast and brightness and inversion...)
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