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Watt second to guide number for flash: >> http://dpk.cloudz.pw/download?file=watt+second+to+guide+number+for+flash << (Download)
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19 Feb 2012 It's Watt-seconds not W/sec, it is the definition of the energy unit Joules. So it's the energy delivered during one flash burst. Since studio heads are bare-bulb units, the GN would only work in addition with a given reflector, or a given light modifier. Guide Number works better for flashes with a built-in reflector,
I was talking with a local pro recently and he indicated that a Canon 580EX with a guide number of 58 had roughly the equivalent 'power' of a 58 watt/second studio strobe. I find this comparison too simplistic but don't have a counter argument to offer. This discussion came up because he had just
Equivalence of actual flash power and Guide Number cannot be computed - there is no equivalence of watt seconds of energy and Guide Number. There is an efficiency factor in converting electrical power to lumens of light (flash is higher efficiency, comparable to fluorescent, significantly higher than incandescent). Guide
18 Jul 2008 Re: Watt Seconds vs Guide Number. In reply to flash output is measured in Beam Candle Power Seconds (BCPS) a flash unit with a Watts per second is what manufacturers claim their equipment deliversbut there is no practical way to know if this is true or to use watts/s in photography. But you do
13 May 2004 My oldest brought home a photo related question from her high school photo class that I have to admit I have no answer for. If you know the watt sec. output of a studio flash unit how do you or can you convert that to a meaningful Guide Number.
13 Nov 2010 Watt-seconds (Ws) is a unit of energy. When reading flash unit specifications, the Ws rating is the amount of energy that can be stored in its capacitors and released when the flash is fired. The Guide Number (GN), on the other hand, is a measure of light. It indicates how intense the light from a single flash is
11 Dec 2010 No, there is no way to convert guide numbers to watt-seconds. Watt-seconds is a measurement of how much energy is used by the flash, not how much light is put out. A significant portion of this energy is wasted as heat, infrared, ultraviolet, etc. A 4 watt-second flash that is 100% efficient will put out the
8 Jun 2008 there is no deterministic conversion from GN to ws because the GN depends on how the light is modified and directed. WS is a rating of the electrical energy stored to make the flash of light. Even the amount of light created by the flash is not completely directly related to the amount of energy stored.
I'm reading up on flashes and not 100% clear how these are connected to one another? Are they the same? What I don't understand is that guide number seems to
2 Sep 2016
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