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  1. #21
    resummerfield's Avatar
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    Quote Originally Posted by c.d.ewen View Post
    .....drill a hole in a scrap piece of wood so that the lens fits inside tightly......
    Excellent idea! I would then cut a slot in the wood, reaching the hole, so you could squeeze the wood around the lens. Much like a ring spanner or filter wrench.
    —Eric

  2. #22

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    Quote Originally Posted by resummerfield View Post
    Excellent idea! I would then cut a slot in the wood, reaching the hole, so you could squeeze the wood around the lens. Much like a ring spanner or filter wrench.
    If you can make the hole so that the lens *just* fits in (I use a lathe), there's no need (or room) to squeeze the wood. The object is to swell the wood fibers with water and create friction around the entire circumference, rather than have one area receive more compression than another. Done right, you'll have to carefully cut the piece to get it off the lens.

    Micro-Tools sells a wrench, called a FlexiClamp, which is basically a thick sheet of copper with a hole cut in one end and a slot running the length of the sheet. Squeezing the slot causes the hole to decrease in size and thus squeeze the lens more or less evenly from all angles.

    Charley

  3. #23
    Murray@uptowngallery's Avatar
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    If a step closer to absolute zero is really necessary, a grocery store near me now sells dry ice (CO2).

    Let's not go to liquid nitrogen...might crack something if rates of thermal expansion (reversed) are too different.

    I think the smarter clamp/grip methods are the way to go. Archaeologists find lots of tools showing how smart our predecessors were without tool catalogs, but they've never found a refrigerator. Don't quote me on this.
    Murray

  4. #24

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    If you haven't tried it you might want to put a block of wood across the front and give it a few light taps with a hammer. Might break something loose.

  5. #25

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    I have used a heat source to warm up the barrel and Ice to keep the stuck inside part from warming up to the maximize the difference in expansion.
    It's not the camera......

  6. #26
    Murray@uptowngallery's Avatar
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    Those FlexiClamps are pretty slick...
    Murray

  7. #27

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    Quote Originally Posted by Murray@uptowngallery View Post
    Those FlexiClamps are pretty slick...
    Wait 'til you see the dent they make in your hand when you try to hold them :o

    I use hose clamps to tighten them.

    Charley

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