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Much of the content of the aperature/light table was lifted from The Ultimate Exposure Computer, which explictly denies the right to copy the material featured on the page for any purpose. Copied the last version of the table in its place.
-- Cintrom 22:27, 22 April 2006 (UTC)
Added a link to Fred Parker's Ultimate Exposure Computer to the page. This is some excellent content that pertains to this article, and I obtained permission from Fred Parker to link to his page. Yes, this is overkill - But after the previous copyright infringement, I felt it was better to stay on the safe side with Fred.
-- Achra 16:01, 20 June 2006 (PDT)
Add to the discussion that the rule is adjusted a stop for fall/winter Sun vs spring/summer Sun when you live at a latitude where the Sun's noon time altitude changes significantly. —Preceding unsigned comment added by 50.46.174.62 ( talk) 11:45, 1 March 2011 (UTC)
In Germany they say: "f/8, wenn die Sonne lacht". If I do so, how do I have to adjust the time? Instead of 1/100 (@ ISO 100) then 1/400 or 1/800? -- 91.6.92.24 ( talk) 16:22, 27 May 2012 (UTC)
I am not so sure how accurate the rule is. It was usual to round to the nearest whole stop, though on most manual cameras the aperture is continuous. Most electronic cameras with manual or aperture priority mode allow 1/2 or 1/3 steps for the aperture. But negative films usually have one stop underexposure latitude, and two or three stops over, so one more stop of exposure is probably good. Note that the rule is based on incident light, so works the same with dark or light subjects. You want dark subjects to come out dark, and light subjects to come out light. (But the printer might try to compensate, and undo what you carefully do.) Gah4 ( talk) 08:30, 27 October 2016 (UTC)
@ Dicklyon: What is a "step"? The sentence is talking about a change of 1 f-stop, since the exposure time is halved. Bubba73 You talkin' to me? 22:57, 11 June 2019 (UTC)
In the paragraph in question, it indicated that one can open the aperture, and in compensation halve the shutter speed. There is a complication in shutter speeds, that they are commonly written in units of seconds, or fractions thereof, and so not speeds. In contrast, one says increase the speed, appropriate for the usual meaning of speed, when setting a shorter shutter open duration. Note that, corresponding to ASA and ISO values, a higher value means higher speed, and so halve should indicate a slower shutter speed. It would be best to avoid this ambiguity and not use the word halve. Gah4 ( talk) 00:11, 16 June 2019 (UTC)
There are recent edits regarding latitude. Seems to me that the difference between latitudes isn't all that huge, and an important part of this rule is that films have some latitude. (Less for slide films, though.) But closer to the equator, with the sun higher, there will be less light on the front of subjects, which likely partly compensates for any higher sun intensity. Of course clouds change everything. Gah4 ( talk) 02:00, 30 May 2020 (UTC)
![]() | This article is rated Start-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | ||||||||||||||||||||
|
Much of the content of the aperature/light table was lifted from The Ultimate Exposure Computer, which explictly denies the right to copy the material featured on the page for any purpose. Copied the last version of the table in its place.
-- Cintrom 22:27, 22 April 2006 (UTC)
Added a link to Fred Parker's Ultimate Exposure Computer to the page. This is some excellent content that pertains to this article, and I obtained permission from Fred Parker to link to his page. Yes, this is overkill - But after the previous copyright infringement, I felt it was better to stay on the safe side with Fred.
-- Achra 16:01, 20 June 2006 (PDT)
Add to the discussion that the rule is adjusted a stop for fall/winter Sun vs spring/summer Sun when you live at a latitude where the Sun's noon time altitude changes significantly. —Preceding unsigned comment added by 50.46.174.62 ( talk) 11:45, 1 March 2011 (UTC)
In Germany they say: "f/8, wenn die Sonne lacht". If I do so, how do I have to adjust the time? Instead of 1/100 (@ ISO 100) then 1/400 or 1/800? -- 91.6.92.24 ( talk) 16:22, 27 May 2012 (UTC)
I am not so sure how accurate the rule is. It was usual to round to the nearest whole stop, though on most manual cameras the aperture is continuous. Most electronic cameras with manual or aperture priority mode allow 1/2 or 1/3 steps for the aperture. But negative films usually have one stop underexposure latitude, and two or three stops over, so one more stop of exposure is probably good. Note that the rule is based on incident light, so works the same with dark or light subjects. You want dark subjects to come out dark, and light subjects to come out light. (But the printer might try to compensate, and undo what you carefully do.) Gah4 ( talk) 08:30, 27 October 2016 (UTC)
@ Dicklyon: What is a "step"? The sentence is talking about a change of 1 f-stop, since the exposure time is halved. Bubba73 You talkin' to me? 22:57, 11 June 2019 (UTC)
In the paragraph in question, it indicated that one can open the aperture, and in compensation halve the shutter speed. There is a complication in shutter speeds, that they are commonly written in units of seconds, or fractions thereof, and so not speeds. In contrast, one says increase the speed, appropriate for the usual meaning of speed, when setting a shorter shutter open duration. Note that, corresponding to ASA and ISO values, a higher value means higher speed, and so halve should indicate a slower shutter speed. It would be best to avoid this ambiguity and not use the word halve. Gah4 ( talk) 00:11, 16 June 2019 (UTC)
There are recent edits regarding latitude. Seems to me that the difference between latitudes isn't all that huge, and an important part of this rule is that films have some latitude. (Less for slide films, though.) But closer to the equator, with the sun higher, there will be less light on the front of subjects, which likely partly compensates for any higher sun intensity. Of course clouds change everything. Gah4 ( talk) 02:00, 30 May 2020 (UTC)