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Type: Posts; User: DaveBell

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  1. Thread: From Spain

    by DaveBell
    Replies
    3
    Views
    36,617

    Very nice! I especially like the fourth image.

    Very nice! I especially like the fourth image.
  2. Thread: Multipinhole

    by DaveBell
    Replies
    4
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    36,996

    Great concept, Igor! Is the internal aperture...

    Great concept, Igor! Is the internal aperture square?
    How about some dimensions??
  3. Thread: Multipinhole

    by DaveBell
    Replies
    4
    Views
    36,996

    Great concept, Igor! Is the internal aperture...

    Great concept, Igor! Is the internal aperture square?
    How about some dimensions??
  4. Replies
    0
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    46,511

    Achromatic planar lenses

    Yet another new (well, June paper) lens design using metamaterials to create high resolution, planar optics.
    Said to work across the visible spectrum, due to use of a material that neither absorbs...
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    2,524

    Very nice tribute, Steve!

    Very nice tribute, Steve!
  6. Replies
    14
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    41,627

    Great image, Joe! That little camera really works...

    Great image, Joe! That little camera really works well.
    Is that structure really just a stack of containers? Where are walkways, etc.?
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    Novel technique to create flat lenses

    This paper reports on a new method of creating flat, diffractive lens structures, an evolution beyond Zone Plates.
    Apparently, by creating transparent photoresist patterns of varying thickness (on a...
  8. Replies
    59
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    136,336

    I tried for quite a while yesterday evening. I...

    I tried for quite a while yesterday evening. I never could get past the CAPTCHA!

    Dave
  9. Replies
    59
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    136,336

    Count me in, please!

    Count me in, please!
  10. Replies
    7
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    38,740

    Brilliant, Ned!

    Brilliant, Ned!
  11. Thread: Amsterdam

    by DaveBell
    Replies
    8
    Views
    1,856

    Very nice, Ricardo! Amsterbridges - I see two,...

    Very nice, Ricardo! Amsterbridges - I see two, at least...
  12. Replies
    17
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    38,374

    What a fine picture! A great way to come back...

    What a fine picture! A great way to come back...
  13. Replies
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    1,276

    Great image! Too bad it's not in color, though;...

    Great image! Too bad it's not in color, though; that looks like a lovely specimen of A. muscaria.
    Not really all that toxic, unlike its cousins. A bit "magic", and at one time, highly prized by...
  14. Replies
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    2,958

    A couple of beautiful shots here, Ned! And the...

    A couple of beautiful shots here, Ned! And the Shell Beach Tide Pool brings back so many memories of hanging out and exploring there, and all of the Sonoma Coast, as a kid!
    Maybe this summer, I can...
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    2,989

    WOW! Makes me think of a landscape on Titan!

    WOW! Makes me think of a landscape on Titan!
  16. Replies
    12
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    3,430

    And if I click the links, I get "Invalid...

    And if I click the links, I get "Invalid Attachment Specified"
  17. Yes! I believe remember your solargraph; very...

    Yes! I believe remember your solargraph; very nice...
    We haven't decided where to go; cloud cover is obviously very important.
    The Northwest segment looks good, but for a (slightly) longer period...
  18. Thanks, Ned! We're so close to this one, it has...

    Thanks, Ned! We're so close to this one, it has to happen. even if I end up in a wheelchair and have to roll myself up north!
    Went to Puerto Vallarta for 7/11/91, Romania for 9/11/99, and Nevada...
  19. Looking for pointers to a motorized bulk film back

    There's a lot of "legacy" equipment out there, but I'm not familiar with much of the medium format gear I might find on eBay, etc.
    I'd like to find (cheaply, of course!) a motorized 6x6 or 6x7 cm...
  20. Replies
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    4,565

    Look on amateur telescope making sites for mirror...

    Look on amateur telescope making sites for mirror cleaning ides.
    Yeah, the projection lenses and filters are intriguing! Extreme aspherical lenses, for which I haven't thought of a good use.
    The...
  21. Replies
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    4,565

    The one I pulled a couple years ago was glass! On...

    The one I pulled a couple years ago was glass! On the order of 1.5 x 2 feet, maybe bigger.
    Cat knocked it over in the living room shortly afterwards, though!
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    4,565

    Look for a discarded rear-projection TV. They...

    Look for a discarded rear-projection TV. They have a very large first surface mirror at the rear of the cabinet.

    Dave
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    2,115

    Camera Obscura photos

    Not my work, but I just ran across an interesting set of images.
    Finnish photographer Marja Pirila's project, "Interior/Exterior" combines people and their rooms with projected exterior images.
    ...
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    2,737

    To which I have to point out that the entire...

    To which I have to point out that the entire 1966+ Adam West Batman series will be released on Blu-Ray in early November.
    ~$175 on Amazon, but as it's the one and only Real Batman...
  25. Thread: Autumn

    by DaveBell
    Replies
    5
    Views
    1,714

    All quite lovely, Nick! The second with the...

    All quite lovely, Nick!
    The second with the mushrooms and skull(?!) is a very striking grouping, but if my attempt at identification is correct, the previous occupant of the skull died from...
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