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  1. #21

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    Oct 2012
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    Here I post the link to the original scan:

    http://www.flickr.com/photos/9044873...n/photostream/

    The three strips were scanned simultaneously.
    I later rescanned the strips using an iPad to backlit the negatives. Because I am not absolutely sure whether the light intensity was identical in all scans, I am not posting these.

    The exposure at each frame is:

    4: EI50 1/60 2.8
    5: EI100 1/125 2.8
    6: EI200 1/250 2.8
    7: EI400 1/500 2.8
    8: EI400 1/125 5.6
    9: EI800 1/250 5.6
    10: EI1600 1/500 5.6
    11: EI1600 1/125 11
    12: EI3200 1/250 11

    Yes, I was slightly dumb that day and only realized I add duplicated some exposure latter.

    I is also possible to note that exposure which are supposed to be equivalent are not perfectly identical. This probably has to do with calibration of shutter speeds. Frame 11 looks slightly thinner than 10. The same goes for frame 7 and 8.

    Feel free to manipulate the file as you wish, and post your own results.

    I have a 16 bits uncompressed file on request.

    Have fun.

  2. #22

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    Test: Tmax400 @ 800,1600 and 3200 in Rodinal Std.

    Quote Originally Posted by jsimoespedro View Post
    Here I post the link to the original scan:

    http://www.flickr.com/photos/9044873...n/photostream/

    The three strips were scanned simultaneously.
    I later rescanned the strips using an iPad to backlit the negatives. Because I am not absolutely sure whether the light intensity was identical in all scans, I am not posting these.

    The exposure at each frame is:

    4: EI50 1/60 2.8
    5: EI100 1/125 2.8
    6: EI200 1/250 2.8
    7: EI400 1/500 2.8
    8: EI400 1/125 5.6
    9: EI800 1/250 5.6
    10: EI1600 1/500 5.6
    11: EI1600 1/125 11
    12: EI3200 1/250 11

    Yes, I was slightly dumb that day and only realized I add duplicated some exposure latter.

    I is also possible to note that exposure which are supposed to be equivalent are not perfectly identical. This probably has to do with calibration of shutter speeds. Frame 11 looks slightly thinner than 10. The same goes for frame 7 and 8.

    Feel free to manipulate the file as you wish, and post your own results.

    I have a 16 bits uncompressed file on request.

    Have fun.
    What I see (and there are plenty who know a lot more) is that you highly over exposed most of them, and that (probably) #10 was close to the"proper" exposure and the rest before were over exposed, the change in aperture would also explain some of the issues others noticed with shadow detail being good in some and not in others that SHOULD have better shadow.

    If you do this again you should keep the same aperture and only change the shutter speed. This might sound strange, but it's the difference between the AMOUNT of light entering the camera, vs RB duration to which the light hits the film. If you alter the speed, you get an overall adjustment to exposure, if you adjust the amount of light coming in, you change the way the light hits the film, the out of focus areas become more in focus, and the light is now hitting the film differently. It may be slight, but it's different.

    But I wouldn't bother with a re-test, what this tells me is that it acts like any other film, if you over expose or under expose, you have to severely compensate in the printing/scanning end.

    What do other more knowledgeable think?

  3. #23

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    Next time I will shoot a less contrasty scene, and record light readings in the highlights and shadows

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