Fisheye adapter won't focus on webcam

Discussion in 'Photography' started by Paul Furman, Mar 27, 2012.

  1. Paul Furman

    Paul Furman Guest

    I've got a Nikon Fisheye Converter FC-E8 .21x attached to a cheap
    Logitech HD Webcam C310 and it's apparently focusing past infinity, or
    very very close. Is there any way to fix that?

    It works fine on my android phone (Samsung SGH-1997 model in exif).

    I recall reading that certain coolpix cameras it's designed for, need to
    be put in a special mode, perhaps macro focusing, for autofocus to work.
    My webcam apparently doesn't have any focusing whatsoever. Perhaps a
    little corrective lens. Held to my eye, the lens gives a sharp image
    although I need reading glasses. Nope, my strongest closeup reading
    glasses just make it worse.

    Ah, OK solved: Open the webcam and the internal lens can be
    screwed/unscrewed to focus. The default is focused about 18 inches away
    for webcam chat usage so tightening the lens so that it focuses to
    infinity solves it.

    BTW since this turned out to be more of a tutorial than a question, I'll
    fill in the rest of what I learned: First I tried a couple different
    door peepholes and those worked but the image circle is much too small
    so you have to use digital zoom to fill the screen and the resolution is
    hideous. Somewhat usable if your budget is $7, it looks cool for video,
    awful for stills. The smaller, cheaper one has a full 180 degree field
    of view, the larger $15 one isn't as wide of a view. The Nikon
    converter cost $100 used, which is not bad. The image circle fits the
    webcam perfectly though in 4/3 aspect ratio. It's cropped just slightly
    on my phone.

    When mounting the lens, or rather mounting the webcam to the lens,
    you'll want to be able to adjust the angle of connection to center the
    image circle. sliding the lens across the front of the camera lens has
    no effect till it vignettes; tilting is what gets it centered. I'm
    thinking a couple thin pieces of wood or metal with at least 3 screws to
    allow fine tuning the placement. It's pretty annoying to have it not
    perfectly centered. For my application (surveillance), I'm probably
    going to want the sky cropped and most of the bottom showing, zoomed in
    to fill a wide screen aspect ratio.
    Paul Furman, Mar 27, 2012
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  2. Paul Furman

    Paul Furman Guest

    Here's the results:
    Paul Furman, Mar 28, 2012
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