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Thread: Post yer pinholes

  1. #191

    Join Date
    Oct 2010
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    Czech Republic
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    Re: Post yer pinholes

    That's a marvelous photograph, George.. Very well done!
    Website of sorts, as well as flickr thing.

  2. #192

    Join Date
    May 2012
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    39

    Re: Post yer pinholes

    Excelent George. I also use a pinhole camera and Fomapan will be my next film.
    I have two questions, as a matter of curiosity:

    1. How did you get the 50mm for a 0.3mm hole? I order a plate with 0,32mm (which I use) and I was advised to use 75mm as focal length.
    2. How do you do the semi-stand? 30 seconds continuous agitation - minute 1 5 seconds agitation - minute 2 - 4 - 8 - 16 ?

    Thank you!

  3. #193
    Jim Jones's Avatar
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    Aug 2006
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    Chillicothe Missouri USA
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    3,065

    Re: Post yer pinholes

    Optimum pinhole diameter has been hotly debated for well over a hundred years. I would use www.pinhole.cz/en/pinholedesigner/ with a user constant of 1.4 for maximum sharpness in the center of the image on panchromatic film and a focal length of 50mm, giving a diameter of .232mm. To obtain better corner sharpness on 4x5 film and somewhat less sharpness in the center, the diameter could be increased somewhat. You can find many other opinions on http://www.f295.org/main/forum. Don't let the science of pinhole photography get in the way of the magic.

  4. #194
    George Sheils
    Join Date
    Jan 2007
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    Ireland
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    160

    Re: Post yer pinholes

    Quote Originally Posted by gtmatias View Post
    Excelent George. I also use a pinhole camera and Fomapan will be my next film.
    I have two questions, as a matter of curiosity:

    1. How did you get the 50mm for a 0.3mm hole? I order a plate with 0,32mm (which I use) and I was advised to use 75mm as focal length.
    2. How do you do the semi-stand? 30 seconds continuous agitation - minute 1 5 seconds agitation - minute 2 - 4 - 8 - 16 ?

    Well, it is a matter of personal taste in relation to pinhole diameter, but I think that for 4x5 format 0,32mm is ideal for a focal length of 45mm - in my opinion. 45mm/0.3 = f150.
    My procedure for exposure is to give an extra stop exposure by rating fomapan 100 at 50 ISO. For most conditions using 50 ISO and an f-stop of f150 will usually yield an exposure time of several seconds. You should be aware that fomapan is very prone to reciprocity and I find the following table very accurate:
    http://consumptive.org/technical/Fom...ild_Effect.pdf
    Finally, my semi stand method is as follows:
    1. Pre-soak the film for 2 minutes at 20 degrees c (68 Fahrenheit) in plain water.
    2. Empty the water and pour in the developer 1 part Rodinal to 100 parts water using gentle agitation (I.e. Swirls) for 20 seconds at the start and tap the bottom of the tank to dislodge air bubbles.
    3. At 15 minutes I agitate gently again for 20 seconds and tap the bottom of the tank.
    4. Finally, at 27 minutes I swirl again for 20 seconds for the final time and at 30 minutes I pour out the developer and fill the tank with plain water.
    5. Pour out the rinse water after 20 seconds and fill the tank with fix. That's it.

    I believe that this method of exposure and development is a gentle and very effective way of providing very printable negatives which have great shadow detail without burning out the highlights.

    Thank you!

  5. #195
    George Sheils
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    Ireland
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    Re: Post yer pinholes

    Quote Originally Posted by andreios View Post
    That's a marvelous photograph, George.. Very well done!
    Thank you, Andrej.

  6. #196
    George Sheils
    Join Date
    Jan 2007
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    Ireland
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    Re: Post yer pinholes

    Quote Originally Posted by Barry Kirsten View Post
    Lovely indeed, George.
    Glad you like it, Barry. 😄

  7. #197
    George Sheils
    Join Date
    Jan 2007
    Location
    Ireland
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    Re: Post yer pinholes

    Quote Originally Posted by h2oman View Post
    Another beauty,George. This one is perhaps my favorite of yours - makes me want to get a pinhole camera!
    Well, thank you so much for your nice compliment! I hope that you do get a pinhole camera. It's great fun. 😊

  8. #198

    Join Date
    Mar 2013
    Location
    San Diego, CA
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    99

    Re: Post yer pinholes

    To go along with the Aircraft thread...
    Harman Titan 4x5
    Harman Direct Positive Paper

    Leatherneck 1 by James Harr's Photos, on Flickr


    James Harr
    Humble Hobbyist

  9. #199

    Join Date
    May 2012
    Posts
    39

    Re: Post yer pinholes

    Thank you George! I'll keep the tips.

  10. #200

    Join Date
    Nov 2012
    Location
    Tuscany - Italy
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    428

    Re: Post yer pinholes

    Padua (PD) Italy - The mask on the washing machine

    - Camera: Zero Image Zero50B 4x5 Pinhole
    - Lens: focal length 50 mm 1:176 (0.28 mm)
    - Exposure: 40 seconds
    - Film: Fuji Instant Black and White Film FP-3000B
    - Lightmeter: Gossen Lunasix 3 reading the incident light
    - Lighting: Ambient light only

    - Scanner: EPSON V700 and EPSON Scan 3.81
    - Software: Adobe Photoshop CS4




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