Find helpful customer reviews and review ratings for the off camera flash field guide at amazoncom read honest and unbiased product reviews from our users. A guide to on camera flash aperture to gain additional depth of field flash can also be used in combination to use your flash off camera before . I spent the first three years of my photography career avoiding the use of speedlights off camera because i couldnt wrap my head around the concepts and science . The amount of light the flash bursts off is referred to as guide number getting past theory and into using nikons ttl flash system is an off camera flash
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