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3 Dec 2006 Some monolights include a rating for a Guide Number (GN), which is a number that relates the output of flash. Guide Numbers are quoted in feet or meters (depending on where you live in the world) and are valid for a specific ISO speed. The higher the guide number, the greater the light output. Guide
I was looking at some lower end monolights, like the calumet Genesis 200 and the Adorama Flashpoint. Looking at the specs these have a guide number of 125 and 118 respectively. Wondering how this compared to my 430EX speedlight, I looked up the specs for that and found a GN of 141. So is my
8 Jun 2008 Different modifiers (reflectors, diffusers, etc) affect how the light is focused and directed. A small, low-power flash with an highly concentrated light beam may have a relatively high guide number - a technique used to boost specifications. An high-powered monolight may have a relatively wide beam (70
13 Nov 2010 Guide numbers are mostly used on speedlights and watts-second is being used on monolights. Does anybody know the computation Example: a studio flash with rated at 250 Ws may have a light output equivalent to a speedlight with a GN of 63 (meters) or 209 (feet). Note that light spread affects the GN,
Flash exposures are interesting in that, with the exception of the lightning-like blasts of light produced by larger studio systems and the tinier “poofs" of light emitted from pop-up flashes, to the human eye all flash exposures are perceived as being equal in value even though they might differ by several stops. Unlike tungsten
30 May 2013 Speedlights are given a power rating in the form of a guide number, the is the exposure reading at certain number of feet away from the flash. It's important to remember that speedlights have a built-in reflector and diffuser. Monolights come unmodified. They are just a light. The type of reflector and other
Guide Number is Not useful for TTL flash because the camera automation controls TTL. TTL will necessarily have to use roughly the same flash power level that GN would compute, we just cannot control TTL that way. And GN is Not used for bounce flash, because of the longer light path distance, and the ceiling reflectance
1 Jan 2005 Watt-seconds is a measure of potential energy stored in flash units capacitors while guide numbers are derived from actual out put of the flash unit. Additionally there are differences in how efficiently a flash head & pack or monolight convert the potential energy stored in the capacitors to actual light, and
2 Sep 2016
Re: Guide Numbers, Shutter Speeds and ISO In reply to gayang3 • Oct 29, 2010. Shutter speed doesn't matter in flash photography (usually.) However, shutter does matter for ambient light exposure, and every flash image is a combination of a flash exposure and an ambient light exposure. So in that

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February 2018