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Exposure calculation
When you use a view camera for macro work you have long extention on the
bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? I am using a 6x9 Linhof and want to play with a 5.6/100 Componon-S. I guess you don't compensate down to 1m? ......but from here and closer? Max |
Exposure calculation
"Max Perl" wrote
When you use a view camera for macro work you have long extention on the bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? Calumet Photo used to (still does?) sell an inexpensive (under $10) "close-up calculator." It consists of a square about 1-1/2" on each side (one face is black, the other white), and a "ruler" that you place on the ground glass. You place the small square piece up against your subject. With the "ruler" you measure the size of the square as its image appears on the ground glass and you read directly in f/stops the amount of extra exposure required. |
Exposure calculation
"Howard Lester" skrev i en meddelelse news:nYqdnaeYm4VXz5vVnZ2dnUVZ_veinZ2d@dakotacomip. .. "Max Perl" wrote When you use a view camera for macro work you have long extention on the bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? Calumet Photo used to (still does?) sell an inexpensive (under $10) "close-up calculator." It consists of a square about 1-1/2" on each side (one face is black, the other white), and a "ruler" that you place on the ground glass. You place the small square piece up against your subject. With the "ruler" you measure the size of the square as its image appears on the ground glass and you read directly in f/stops the amount of extra exposure required. Then it must be this one? http://www.calumetphoto.com/item/CC9201/ |
Exposure calculation
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Exposure calculation
"Max Perl" wrote
Does somebody have an easy way to calculate the [bellows extension] exposure compensation? http://www.salzgeber.at/disc/ -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index2.htm n o lindan at ix dot netcom dot com |
Exposure calculation
In article ,
"Max Perl" wrote: When you use a view camera for macro work you have long extention on the bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? I am using a 6x9 Linhof and want to play with a 5.6/100 Componon-S. I guess you don't compensate down to 1m? ......but from here and closer? Max A held calculator with this formula and then you can make your own "dummy stick" Indicated F/stop (Use a light meter) * Bellows Extension (Use a ruler) ____________________________________ Focal Length (Of the lens) = Effective F/stop. -- Reality is a picture perfected and never looking back. |
Exposure calculation
"____" skrev i en meddelelse ... In article , "Max Perl" wrote: When you use a view camera for macro work you have long extention on the bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? I am using a 6x9 Linhof and want to play with a 5.6/100 Componon-S. I guess you don't compensate down to 1m? ......but from here and closer? Max A held calculator with this formula and then you can make your own "dummy stick" Indicated F/stop (Use a light meter) * Bellows Extension (Use a ruler) ____________________________________ Focal Length (Of the lens) = Effective F/stop. -- Reality is a picture perfected and never looking back. Thank you! I will try this! |
Exposure calculation
"Nicholas O. Lindan" skrev i en meddelelse ... "Max Perl" wrote Does somebody have an easy way to calculate the [bellows extension] exposure compensation? http://www.salzgeber.at/disc/ -- Nicholas O. Lindan, Cleveland, Ohio Darkroom Automation: F-Stop Timers, Enlarging Meters http://www.darkroomautomation.com/index2.htm n o lindan at ix dot netcom dot com Thank you! I will try out the formular! |
Exposure calculation
Max Perl wrote:
When you use a view camera for macro work you have long extention on the bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? I am using a 6x9 Linhof and want to play with a 5.6/100 Componon-S. I guess you don't compensate down to 1m? ... but from here and closer? Would I be right in the belief that this question, and the solutions to it, would be applicable to formats other than "large", should one care to do such a thing? (I do extremely little (haha) macro work, and my largest camera is a 645, and while that and my old 35mm are pretty clunky, they still are advanced w/r/t many large-format camera, correct? And, of course, my DSLR does everything but procreate. So I doubt I will *need* to know this. But it would be nice to know if it applies, and, if so, how to do it.) |
Exposure calculation
I am surprised that no one has responded, yet. I'll be the duffer.
With a flash, a doubling of the distance from flash to subject is a 4 fold reduction in illumination that's 2 stops. So in the same vein a doubling of the bellows extension from say 150mm to 300mm would necessitate a 2 stop increase or 4 fold increase of light requirement getting to the film.. Therefore a partial extension say 1/2 way would be 1 stop increase and so on. Rough as guts but it is quick and gets you in the ball park (where ever that is) to the nearest 1/2 stop. This does require one to mark by big fat texta or neat biro on tape or mearly tape measure the increase in bellows extension. If you are new to macro, keep watch on the lighting so that the lens is not so close to the product that it casts it's own shadow. "MangroveRoot" wrote in message news:KC32k.2583$Yw1.410@trndny02... Max Perl wrote: When you use a view camera for macro work you have long extention on the bellows. You then need to compensate for the lost light to calculate a proper exposure. Does somebody have an easy way to calculate the exposure compensation? I am using a 6x9 Linhof and want to play with a 5.6/100 Componon-S. I guess you don't compensate down to 1m? ... but from here and closer? Would I be right in the belief that this question, and the solutions to it, would be applicable to formats other than "large", should one care to do such a thing? (I do extremely little (haha) macro work, and my largest camera is a 645, and while that and my old 35mm are pretty clunky, they still are advanced w/r/t many large-format camera, correct? And, of course, my DSLR does everything but procreate. So I doubt I will *need* to know this. But it would be nice to know if it applies, and, if so, how to do it.) |
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