Nikon TC20 teleconverter cap jammed

Discussion in 'Nikon' started by Paul Furman, Nov 20, 2005.

  1. Paul Furman

    Paul Furman Guest

    The second cap on my Nikon TC20 teleconverter is jammed on. Not the
    normal fat black lens-back cap but the other one that's gray & flatter.
    It twists counterclockwise to loosen but won't come off fully. It ought
    to unscrew clockwise to remove according to the arrow on it. When
    loosened it'll lift up partially at an angle but something is catching
    no matter how I adjust the loose levers. It's been bouncing in my pack
    protected by only a cloth draw-string bag.

    Have I screwed it up (pardon the pun)?
    Paul Furman, Nov 20, 2005
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  2. Paul Furman

    Robert Brace Guest

    Saw that happen once. It was caused by the chap mixing up and older design
    body cap with the newer version (which came with the new converter). When
    putting the body cap back on the converter he got it on but it was hell to
    get off again. It seemed just a hair "bigger". He persevered & it finally
    came off.
    The older body cap and the newer cap from the converter were different model
    numbers (check inside the cap once you get it off).
    Robert Brace, Nov 20, 2005
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  3. Paul Furman

    Paul Furman Guest

    xposted to from

    Damn I found this solution but it doesn't make sense:

    "I grasped the cap and gently pulled up and the I pushed it aginst the
    inside of the teleconverter."

    All I can get from that is some combo of push/pull? There are three
    flanges, two come free but the third is still stuck, the one below the
    word Nikon. When tightened, I can slide it back & forth a bit, pivoting
    on that same point. All I can get from this description is that it
    doesn't involve pressing the release lever button or moving the loose
    metal tabs.

    Sorry, I misstated this. It loosens as expected but only an eighth of a
    turn. I did just notice that the dot for alignment is about a quarter
    turn off (or 3/4 turn depending how you see it). I guess this is the

    No that's not the problem but thanks. All my lens back caps are the same
    LF-1, it's the other side BF-3 that's causing the problem, I guess it
    would be similar to a body cap if I stored the body without a lens but I
    think I left that one in the box when I unpacked it. I'm talking about
    the piece that fits on the end you see in this picture:
    The end that recieves the lens. This page says it's model number BF-3
    Paul Furman, Nov 20, 2005
  4. Paul, this happened to me once and my assumption is it's caused by not
    having the black dot on the cap lined up with the white dot on the TC when
    you put the cap on (This cap will fit in three different orientations).
    This has nothing to do with different cap revisions since my new TC-20E II
    came with the original cap. It will take several minutes to free up by
    moving the TC in different position so you can hear that clicking sound made
    by some internal mechanism moving by gravity. Just keep trying light
    pressure while changing positions and it will pop off when you least expect
    it. This problem never happened to me again since I'm very careful to align
    the dots prior to cap installation.

    Rita Ä Berkowitz, Nov 20, 2005
  5. Paul Furman

    Paul Furman Guest

    Alright, I got it.

    Loosen till it partially lifts then push the side that's still hooked
    from the side hard toward the center and continue lifting the loose side
    like a hinged door forcing it up as you feel the plastic tearing a
    little. It made some minor damage to the plastic flange but works fine
    if put back on WITH THE DOTS MATCHING!!!


    I'd guess I must have forced it a little when putting it on wrong so if
    you even feel like you need to 'snap' it in place working in the dark
    that means it's misaligned. Don't 'snap' it in place.

    Paul Furman, Nov 20, 2005
  6. Take some white out or nail polish or white touch up paint and mark the
    dot! Makes it much easier the next time around to get the cap on correctly.
    Ed Ruf (REPLY to E-MAIL IN SIG!), Nov 20, 2005
  7. Paul Furman

    no_name Guest

    Looks something like this?

    BODY CAP, plugs the hole in the front of the camera body when no lens is


    plugs the hole in the front of a tele-converter when there's no lens
    mounted on it.

    NOT a lens cap which covers the lens bayonet when the lens is not
    installed or the bayonet end of the TC ...

    BF = _B_ody _F_ront.

    The illustration is a BF-1A; your page refers to a BF-3a - two different
    models of body cap (AKA Front Cap).

    He was saying body caps came in different models and the older ones were
    larger than the newer ones. If you've mixed up an older cap, e.g. the
    one that came with your camera, with the new one that came with the TC,
    the older body cap could stick in the front of the TC; goes on easy, but
    is hard to get off.
    no_name, Nov 20, 2005
  8. Paul Furman

    Paul Furman Guest

    Yes, mine is a BF-3A, it's light gray plastic and apparently is a
    difficult item to order a replacement for. I got it off with a little
    force and minimal damage. The metal version probably wouldn't be
    possible to force on (snap on) wrongly. My TC is designed for an AF-S
    lens (autofucus motor inside the lens) and apparently is a bit different
    from non-AF-S teleconverter caps is there even is such a thing.
    Paul Furman, Nov 20, 2005
  9. Paul Furman

    Paul Furman Guest

    Hmm, OK maybe a way to get it off without force then. My force was firm,
    not brutal grunting, maybe enough to crush a peanut shell <grin>. I
    could feel the plastic bending and giving way as it released. It left a
    mark in the plastic. Certainly much less force than it took to 'snap'
    into place incorrectly.
    Paul Furman, Nov 20, 2005
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