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tcolgate's latest activity

  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    Yep. With a single panel it's 25mm, two panels 50mm, 3 panels is 75mm. The 25mm single panel vignettes heavily. About a 134mm angle of...
    • 20250801_160256.jpg
    • 20250801_160103.jpg
  • tcolgate
    My Houghton Butcher Ensign Cameo. The shutter must have been relatively recently serviced (it works perfectly at all speeds). I've made...
    • 1778958078248.jpeg
  • tcolgate
    tcolgate replied to the thread Thorium glass?.
    Some of the Zuiko Pen F lenses are thoriated (the 100 I think?). I've certainly not found and problems with it.
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    It's the one deficiency of the Zero camera 8 have. They do give you a plastic viewfinder sheet, though I lost the 4x5 one. You're ok if...
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    For my Zero45 the equivalents to 35mm are 21mm, 14mm and 7mm. For the Zero69 it's between about 18mm and 14mm , depending on the frame...
  • tcolgate
    I had about 1/5th of a bottle sitting for 6 months that I then discovered had failed (the hard way)
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    The only new thing in pinhole really is the actual pinhole manufacture and size calculation, and there's a limit to the final impact...
  • tcolgate
    If I'd been sufficiently aware at the time I'd have tried to get that whole chair in and trim a little of the left hand side, though I...
  • tcolgate
    Yes! I like that interpretation, the still fixed "objects" vs the billowing clothes and unseen wind. Who knew that a gnome could say so...
  • tcolgate
    Thank you to everyone for the kind and considered feedback. This one was far more luck than judgement, but at least seeing something in...
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    I made myself a little laminated card with exposure time (as metered at f/22) vs actual exposure time for my pinhole, adjusted for...
    • pinhole-fp4.png
  • tcolgate
    That's an jnteresting crop! I do think I prefer the full scene (though I'm biased by the memory of standing there). But you've managed...
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    Absolutely! (my post wasn't a response to yours, but to the one before talking about optimal pinholes). I've seen the "make a bump, sand...
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    This is all a bit unnecessary for a fun thing like pinhole photography... but... focal length is literally the distance from the...
  • tcolgate
    tcolgate replied to the thread Pinhole precision.
    The distance of the hole from the film/paper determines the focal length. The size and accuracy of the pinhole controls the sharpness. I...
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