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How to light a church
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<blockquote data-quote="WayneF" data-source="post: 445110" data-attributes="member: 12496"><p><strong>Re: How to light a church?</strong></p><p></p><p>Aw you guys... Never seen multiplication before? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> Thanks, but it's really no big deal. I have learned the inverse square law, but it's just details. No grand new theories. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p></p><p></p><p>Red does tend to clip in Daylight or Flash white balance, but it's not so much the red here. The flash is too close in the first picture (too close for the large range needed). The one center red jacket is overexposed (maybe too much overlap of the two flashes?), but mostly, it is all the front row faces that are overexposed. The second picture is farther back, and did better, greater acceptable range.</p><p></p><p>So it is the front row DISTANCE that is overexposed. Direct flash can only be a proper exposure at one single distance. Anything closer is brighter, and anything farther is darker. But how much works on sort of an exaggerated percentage basis (inverse square law), and a greater distance simply has more middle ground range. Important parameters include the depth of the needed range, and the distance to the middle range considered. We adjust the flash power for the middle row, not the front row. We can stand back and zoom in, or we can place just the lights further back. This does require significantly greater flash power, perhaps multiple lights.</p><p></p><p>I put a Guide Number calculator at <a href="http://www.scantips.com/lights/flashbasics1c.html" target="_blank">Understanding Guide Numbers, including GN Calculator</a></p><p>and one of its features is that it shows this depth range for various exposure tolerances, like plus and minus 1/4 or 1/3 stop (each side of middle distance). I had not seen that feature before, but it just falls out of the numbers. Seems important photographically.</p><p></p><p>Guide Number and Inverse Square law is computed about direct flash, but umbrellas and softboxes can be approximated (the path distance fall off, not the absolute GN intensity) by considering the path distance to the FLASH itself. That means distance to the flash tube in softboxes or shoot through umbrellas, or to the umbrella fabric and back to the flash tube in reflected umbrellas.</p></blockquote><p></p>
[QUOTE="WayneF, post: 445110, member: 12496"] [b]Re: How to light a church?[/b] Aw you guys... Never seen multiplication before? :) Thanks, but it's really no big deal. I have learned the inverse square law, but it's just details. No grand new theories. :) Red does tend to clip in Daylight or Flash white balance, but it's not so much the red here. The flash is too close in the first picture (too close for the large range needed). The one center red jacket is overexposed (maybe too much overlap of the two flashes?), but mostly, it is all the front row faces that are overexposed. The second picture is farther back, and did better, greater acceptable range. So it is the front row DISTANCE that is overexposed. Direct flash can only be a proper exposure at one single distance. Anything closer is brighter, and anything farther is darker. But how much works on sort of an exaggerated percentage basis (inverse square law), and a greater distance simply has more middle ground range. Important parameters include the depth of the needed range, and the distance to the middle range considered. We adjust the flash power for the middle row, not the front row. We can stand back and zoom in, or we can place just the lights further back. This does require significantly greater flash power, perhaps multiple lights. I put a Guide Number calculator at [URL="http://www.scantips.com/lights/flashbasics1c.html"]Understanding Guide Numbers, including GN Calculator[/URL] and one of its features is that it shows this depth range for various exposure tolerances, like plus and minus 1/4 or 1/3 stop (each side of middle distance). I had not seen that feature before, but it just falls out of the numbers. Seems important photographically. Guide Number and Inverse Square law is computed about direct flash, but umbrellas and softboxes can be approximated (the path distance fall off, not the absolute GN intensity) by considering the path distance to the FLASH itself. That means distance to the flash tube in softboxes or shoot through umbrellas, or to the umbrella fabric and back to the flash tube in reflected umbrellas. [/QUOTE]
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