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  1. #11
    RalphLambrecht's Avatar
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    a couple of things before you go ottwith pin hole sharpness:
    1. the 'beauty of pinhole images lies inthe fact that they are not perfectly sharp, don't ruin that.
    2.there are two different 'optimal pinhole diameters; one one for maxresolution and one for max contrast(sharpness)
    good luck.
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  2. #12

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    Thanks everyone,
    I see some etched pinholes in my near future! But I will compare to laser and EXPERTLY filed holes.
    Why,some may ask, do I wanna make sharp looking pinholes. At this time I make everything that is used producing my final image, EXCEPT the lense. I make all my emulsions and everything else that goes into, or is used producing, my final piece of work, EXCEPT the lens. Call me a narcisistc egomaniac if you so choose. But my goal is to make Everything that goes into my final images. I don't think that I could ever produce quality lenses. Since my final images are Pt/Pd/Au/Pigment based color separation work, I usualy strive for only one image per year. That is working everyday. High production ain't my bag.

  3. #13
    bvy
    bvy is offline

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    Quote Originally Posted by Mainecoonmaniac View Post
    And you made the lens and camera? Wow. Great job. So how did you calculate the aperture?
    Thanks. I think I scanned it at high res and did some mesaurements and calculations. ~f/226 is what I came up with.

    I've got to go back to a point Ralph just made. Maybe I got lucky crafting such a sharp pinhole -- I did a lot of research at the time and was pretty meticulous. But I remember being initially disappointed with the super sharp images I was getting. In some cases (like what I posted) it worked well, but I was after something softer and not so perfect, like many of the great pinhole images I had seen in books and online.

  4. #14
    NedL's Avatar
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    Quote Originally Posted by wildbillbugman View Post
    Thanks everyone,
    I see some etched pinholes in my near future! But I will compare to laser and EXPERTLY filed holes.
    Why,some may ask, do I wanna make sharp looking pinholes. At this time I make everything that is used producing my final image, EXCEPT the lense. I make all my emulsions and everything else that goes into, or is used producing, my final piece of work, EXCEPT the lens. Call me a narcisistc egomaniac if you so choose. But my goal is to make Everything that goes into my final images. I don't think that I could ever produce quality lenses. Since my final images are Pt/Pd/Au/Pigment based color separation work, I usualy strive for only one image per year. That is working everyday. High production ain't my bag.
    Given all of this, you could try making some pinholes. You have more than enough patience. A needle, some emery paper and patience is all that it takes.

  5. #15
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    Quote Originally Posted by wildbillbugman View Post
    Hello to all,
    I have not stuck my head into this Forum for a long time. My question is: For as close as is possible to a "Perfectly"round hole, I have read that acid etched holes are superior to laser holes. I am also in possesion of some holes that were micro-filed under magnification and are claimed to be superior to laser drilled holes. My goal here may be in conflict with some people's Philosophy. But I want to get the sharpest image that I can, using no lense.. I found a company website that claims superior holes via acid etching. The cost is high, but not discouragingly so.
    Bill
    Hi Bill,
    I was wondering what kind of camera you use and what your focal length is? I recently got me some "perfect pinholes" normally used for elektron microscopes. If I have the right size for you, I'm willing to mail you one so you can experiment with it before buying an "expensive" pinhole? In return you can send me a nice print made with the pinhole.
    Send me a PM with your address if interested.

    "Have fun and catch that light beam!"
    Bert from Holland
    my blog: http://thetoadmen.blogspot.nl
    Linkedin pinhole group: http://tinyurl.com/pinholegroup
    "Have fun and catch that light beam!"
    Bert from Holland
    my blog: http://thetoadmen.blogspot.nl
    my Linkedin pinhole group: http://tinyurl.com/pinholegroup


    * I'm an analogue enthusiast, trying not to fall into the digital abyss.
    * My favorite cameras: Hasselblad SWC, Leica SL, Leica M7, Russian FKD 18x24, Bronica SQ-B and RF645, Rolleiflex T2, Nikon F4s, Agfa Clack and my pinhole cameras

  6. #16

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    Hi Toadmen,
    I have sent to you a private message with all info. I am getting a bit excited about this. I hope that you are not repulsed by insects. Macro "Portraits" of bugs, magnified to the extream , is my specialty.

  7. #17
    NedL's Avatar
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    I think if you are planning to use this for macro, the calculations for your optimal pinhole might be different. I seem to remember reading that the pinhole can be smaller for macro work. Haven't tried it myself but I think there are people here who will know. You might want to check this before deciding on a size.

    Edit: http://www.apug.org/forums/forum62/1...y-pinhole.html has a link.
    Last edited by NedL; 06-11-2013 at 09:57 PM. Click to view previous post history.

  8. #18
    Mark Fisher's Avatar
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    If you are going acid etched (or laser) you can probably get a bunch of them made for nearly the price of one if you are going to an etching or laser cutting place.
    Your first 10,000 pictures are the worst - HCB

    www.markjamesfisher.com

  9. #19
    RalphLambrecht's Avatar
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    a pin hole can easily produce 7 lp/mm,and consequently is as 'sharp' as it gets or needs to be. your eyes cannot resolve more than that anyway, but i agree with the comment about contrast vsresolution'sharpness is more about contrast than resolution!
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  10. #20

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    Hi Wild Bill
    Mike Walker here I make the Harman Titan pinhole cameras, acid etched holes are superior to laser holes, and if done the right way they very very round, I am going to upset some here, put round does not matter that much, it is more the sharpness of the inside edge of the hole.
    I can back this up, as Schneider once had a play with this, and by taking 3 scalpel blades interlocking they and blacking with candle smoke made what they said, was as sharp a pinhole as it was possible to make.
    Hope this helps.
    Mike

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