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  1. #21
    Toffle's Avatar
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    Quote Originally Posted by paulie View Post
    thanks for your help

    i will test the lens spacing i think then i will rest :0)
    You could also test it as a convertable... try a shot with just the front or the rear elements. Your focal length and aperture will need to be recalculated, but it might help isolate the problem.
    Tom, on Point Pelee, Canada

    Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...

    http://tom-overton-images.weebly.com


  2. #22
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    yeah ive used the lenses rear element reversed before and it worked well,around 350mm at f13, no hot spot, sharp in the center soft around the edges on a 4x5 view camera

    unfortunately the extra focal length would warrant a complete new design and construction of my hobo

    little disappointing, but i will live

  3. #23
    Toffle's Avatar
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    Quote Originally Posted by paulie View Post
    yeah ive used the lenses rear element reversed before and it worked well,around 350mm at f13, no hot spot, sharp in the center soft around the edges on a 4x5 view camera

    unfortunately the extra focal length would warrant a complete new design and construction of my hobo

    little disappointing, but i will live
    The other option is to put it in a box and send it to me... That's the kind of stuff I love to mess with.
    Tom, on Point Pelee, Canada

    Ansel Adams had the Zone System... I'm working on the points system. First I points it here, and then I points it there...

    http://tom-overton-images.weebly.com


  4. #24
    paulie's Avatar
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    haha i think ill keep it for the rear cell reversed, thats a good combo anyways, i am going to test it one more time , if its no good i will revert to my 250mm pinhole

  5. #25
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    i today tested the lens reversed on a calumet and this has corrected the hotspot,great but how do i trigger the shutter, well...

    my hobo camera is foam core so i just made a hole and pushed a shutter relaese through and glued it firmly with epoxy resin and graphite/Indian ink to light proof it

    this now allows me to preset the shutter and aperture (thats no problem), i lock the shutter release to prevent accidental firing.

    here is a shot i took tonight

    1.5 hours f22 view from my balcony ,jordaan amsterdam

    thanx for your help

    i also have picked a couple repromaster lenses to play with

    lucky me :0)

  6. #26
    paulie's Avatar
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    Click image for larger version. 

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