![]() ![]() While the actual amount of light produced for a given number of wattseconds varies, depending on the efficacy of the unit's design, this term provides a reasonable guide to comparative light output, as long as real wattseconds are specified.Įffective wattseconds are an arbitrary rating based on no real standard and are of little or no value. Q: What is the difference between joules, wattseconds, and effective wattseconds rating?Ī: The wattsecond rating (otherwise known as joules) defines the amount of electrical power discharged with each flash. Here's a section from the Alien Bees web site. Seem to me you're trying to compare apples to lug-nuts. ![]() im guessing the size of the umbrella/reflector will beįactor as well, im using the photoflex octodomes, 5' (1.5 Meters) To calculate watts to f stops? i have the photogenic 2500DR For any country at any time, the length of your shadow should be less than 3 paces.Sorry to post this here, but i couldn't post this in the lightingįorum, kept getting a weird page popping upĪnyway, can anyone provide a formula or a simple explination on how In the UK, that's approximately 10am - 5pm on a summers day from May to August and 11am - 4pm for April and September. ![]() Remember - The assumption is that the sun is at least 30 degrees above the horizon. This means choose a lower aperture number or a slower shutter speed. If the settings don't tally with the camera you are using, err on the side of overexposure. Negative film is very forgiving and can be overexposed by 3 stops or underexposed by 1 stop without much effect on the final image. The speed and aperture settings are what you might find on these old cameras. These calculators have been designed with vintage cameras in mind. Simply use the calculators below to be able to enjoy your vintage camera without stress. The information for working out these settings can be found elsewhere on the web. A simple and effective way to check if the sunny 16 rule can be applied, at any time in any country, is to ensure that the length of your shadow is less than 3 paces.įrom this basic setting, other settings for different weather conditions, different apertures and different shutter speeds can be calculated. In the UK that's 10am - 5pm on a summers day from May to August and 11am - 4pm for April and September. The assumption is that the sun is at least 30 degrees above the horizon. So, on a sunny day using ISO 100 film, set the aperture to f/16 and the speed to 1/100s. On a sunny day set aperture to f/16 and shutter speed to the reciprocal of the ISO film speed - Job done! The rule works well for negative film which has a lot of latitude, but not so well for colour slide film where more accurate exposure is desirable. With incident light systems, this does not happen. ![]() You have to compensate for the nature of the subject. Reflected light meters can lead to a black cat becoming grey and the White Villages of Spain also becoming grey. The rule is based on incident light rather than reflected light so the intricacies of the 'zone system' and other systems invented to confuse things don't apply. The 'Sunny 16’ rule is a method of estimating correct daylight exposures without a light meter. Home > resources > sunny 16 Sunny 16 Rule The Issuesĭon't let complex metering issues get in the way of enjoying your vintage cameras. ![]()
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