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  1. #1

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    Old post office and customs house


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    I'm not sure the images form my latest camera are as sharp as they could be.

    So I have made a few changes

    The original set up was 90mm focal length with a 400 micron pinhole.

    I have now increased the focal length so it's now 112mm still with the 400 micron pinhole.

  2. #2

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    Looks nice...you did a good job!

  3. #3

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    Looks good to me.

    Jeff

  4. #4
    DWThomas's Avatar
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    Lookin' good!

  5. #5
    PhotoBob's Avatar
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    Very well made image.
    Follow the Light John 8:12
    ~~~PhotoBob

  6. #6
    Jim Jones's Avatar
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    It looks good to me, too. For a 400 micron pinhole and using PinholeDesigner with a user constant of 1.4, I'd try a focal length of 150mm.

  7. #7

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    Thanks Guys
    Jim I have had a look at the Pinhole Designer and the figures just don't add up. I'm not sure I understand the 'user constant' of 1.4 on the PD downloaded it shows 1.5 and the focal length is 129mm for the 400 micron pinhole

  8. #8
    Jim Jones's Avatar
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    You can set the user constant to whatever you want. I chose 1.4 based on testing for maximum sharpness in the center of the image. A larger constant favors sharpness towards the edges of the image at a cost of some sharpness in the center. There is more magic than math in pinhole photography. We can do whatever gives each of us the results we like.

  9. #9
    SMBooth's Avatar
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    Old post office and customs house

    That's a interesting little titbit Jim. Thanks, I learn more every day.

  10. #10

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    Thanks Jim



 

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