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#1
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zone system test with filter on lens?
I'd like to photograph a gray card outside on an overcast day, in
order to do some zone system testing with my new camera and lenses. Since I will eventually be using the camera in the portrait studio with a yellow/green filter, would it be wrong to do the testing with the filter over the lens? Thanks in advance for your advice on this. phil lamerton |
#2
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zone system test with filter on lens?
Phil Lamerton wrote:
I'd like to photograph a gray card outside on an overcast day, in order to do some zone system testing with my new camera and lenses. Since I will eventually be using the camera in the portrait studio with a yellow/green filter, would it be wrong to do the testing with the filter over the lens? Are you doing a film speed test? If you intend to use the filter nothing wrong with testing with the filter on. It'll give you a more accurate result. Nick |
#3
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zone system test with filter on lens?
In article ,
Nick Zentena wrote: Phil Lamerton wrote: I'd like to photograph a gray card outside on an overcast day, in order to do some zone system testing with my new camera and lenses. Since I will eventually be using the camera in the portrait studio with a yellow/green filter, would it be wrong to do the testing with the filter over the lens? Are you doing a film speed test? If you intend to use the filter nothing wrong with testing with the filter on. It'll give you a more accurate result. Nick I agree,....its the best method for absolute testing. -- Baltimore & DC Large Format User Website http://members.verizon.net/~gregoryblank For best results expand this window at least 6" at 1152 x 768 resolution |
#4
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zone system test with filter on lens?
Phil Lamerton wrote:
I'd like to photograph a gray card outside on an overcast day, in order to do some zone system testing with my new camera and lenses. Since I will eventually be using the camera in the portrait studio with a yellow/green filter, would it be wrong to do the testing with the filter over the lens? Are you doing a film speed test? If you intend to use the filter nothing wrong with testing with the filter on. It'll give you a more accurate result. Nick I agree,....its the best method for absolute testing. A HREF="http://members.verizon.net/~gregoryblank"http://members.verizon.net /~gregoryblank/A If the yellow filter was put on and zones I to X were shot (at the EI determined by a no filter test), and then the film was processed using what the no filter test determined to be the correct time and agitation, what is the predicted change in the density in the shots that used the filter? TIA, Curtis |
#5
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zone system test with filter on lens?
In article ,
(CWal871581) wrote: If the yellow filter was put on and zones I to X were shot (at the EI determined by a no filter test), and then the film was processed using what the no filter test determined to be the correct time and agitation, what is the predicted change in the density in the shots that used the filter? TIA, Curtis You can use a mathmatical formula to determine the approximate density but using the filter and reading each zone or steps on a wedge etc is prbably more accurate. -- Baltimore & DC Large Format User Website http://members.verizon.net/~gregoryblank For best results expand this window at least 6" at 1152 x 768 resolution |
#6
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zone system test with filter on lens?
"Phil Lamerton" wrote in message om... I'd like to photograph a gray card outside on an overcast day, in order to do some zone system testing with my new camera and lenses. Since I will eventually be using the camera in the portrait studio with a yellow/green filter, would it be wrong to do the testing with the filter over the lens? At the risk of incurring the rath of the previous responders, No, what you propose is not a good idea. The basic idea of testing the film speed, zone testing, etc, with the filter in place is fine. Doing the testing in overcast daylight where the planned use is in studio, under tungsten or electronic flash, is a bad idea because the color temperature of overcast daylight is much higher than anything you will use in the studio. The studio response of the film/filter combination will be quite different than your testing experioence, rendering the point of your testing largely irrelevant. |
#7
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zone system test with filter on lens?
In article ,
"Randy Stewart" wrote: At the risk of incurring the rath of the previous responders, No, what you propose is not a good idea. The basic idea of testing the film speed, zone testing, etc, with the filter in place is fine. Doing the testing in overcast daylight where the planned use is in studio, under tungsten or electronic flash, is a bad idea because the color temperature of overcast daylight is much higher than anything you will use in the studio. The studio response of the film/filter combination will be quite different than your testing experioence, rendering the point of your testing largely irrelevant. Actually your correct and that should have been noted by the rest of us. & to the O.P. In order to obtain accurate results you have to test the film under the same conditions you wish to use it. -- Baltimore & DC Large Format User Website http://members.verizon.net/~gregoryblank For best results expand this window at least 6" at 1152 x 768 resolution |
#8
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zone system test with filter on lens?
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#9
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zone system test with filter on lens?
At the risk of incurring the rath of the previous responders, No, what you
propose is not a good idea. The basic idea of testing the film speed, zone testing, etc, with the filter in place is fine. Doing the testing in overcast daylight where the planned use is in studio, under tungsten or electronic flash, is a bad idea because the color temperature of overcast daylight is much higher than anything you will use in the studio. The studio response of the film/filter combination will be quite different than your testing experioence, rendering the point of your testing largely irrelevant. Thanks for this info. Please could you explain a bit more? If I calculate the film speed and development time for N using my outdoor results, will the difference indoors with electronic flash (or tungsten) be so significantly different that the results will be unusable, given that contrast can be controlled in the studio? By how much would the color temperature outside differ from my electronic flash, and by how much do you think it would throw out the speed test & development time results on black & white film? I suppose I could light the gray card indoors with an electronic flash. Will it not matter that I shall subsequently use varied lighting set-ups (and number of lights). TIA regards, phil lamerton |
#10
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zone system test with filter on lens?
Michael Scarpitti wrote:
Since I will eventually be using the camera in the portrait studio with a yellow/green filter, would it be wrong to do the testing with the filter over the lens? What 'camera and lenses'? How would it affect your answer if you knew the camera and lens in question? Most filters work quite similarly no matter what camera or lens... |
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