Why plastic is trash for cameras

Discussion in 'Digital SLR' started by Rich, Aug 24, 2005.

  1. Rich

    no one Guest

    no one, Aug 27, 2005
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  2. On 24 Aug 2005 09:34:41 -0700, "Rich" <>

    And just what kind of trashy plastic kit do you have, Rich?


    "There has always been war. War is raging throughout the world
    at the present moment. And there is little reason to believe
    that war will cease to exist in the future. As man has become
    increasingly civilized, his means of destroying his fellow man
    have become ever more efficient, cruel and devastating.
    Is it possible to put an end to a form of human behavior which
    has existed throughout history by means of photography?
    The proportions of that notion seem ridiculously out of balance.
    Yet, that very idea has motivated me.

    James Nachtwey
    War Photographer
    John A. Stovall, Aug 27, 2005
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  3. Rich

    RichA Guest

    Except that the aluminum is half the thickness of the plastic
    and it's front bezel seems to have escaped unscathed.

    "Bittorrents are REFUNDS for all the BAD movie products Hollywood
    never gave us refunds for in the past"
    RichA, Aug 27, 2005
  4. Rich

    RichA Guest

    Plastic has other negative characteristics. It's expansion and
    contraction with temp changes is alot worse than metal.
    It also outgasses upon exposure to temp extremes, although I don't
    know what effect that might have on the camera's other parts.

    "Bittorrents are REFUNDS for all the BAD movie products Hollywood
    never gave us refunds for in the past"
    RichA, Aug 27, 2005
  5. Rich

    RichA Guest

    Couldn't bring myself to buying anything like that. Looks like it
    may be the 20D as a "base" camera for me. Meanwhile, I have to make
    do with my 8 meg magnesium bodied prosumer.

    "Bittorrents are REFUNDS for all the BAD movie products Hollywood
    never gave us refunds for in the past"
    RichA, Aug 27, 2005
  6. Rich

    Brian Baird Guest

    Doesn't matter.

    If you knew ANYTHING about materials (you don't, BTW), you'd know that
    comparing thickness is useless unless the materials are the same.

    A steel box would be thinner than the aluminum one, but amazingly they'd
    both fail at the same time - just like this example. Why? There is no
    good reason to over-engineer a part like that.
    Brian Baird, Aug 29, 2005
  7. Rich

    RichA Guest

    What the f--- are you talking about?? They USE materials like
    titanium and aluminum over plastic BECAUSE you can make things thinner
    and they will take the same punishment as thicker plastics.
    Where do you get such nutty ideas?
    Not in that case, since once the camera body is trashed who cares
    about the inside?

    "Bittorrents are REFUNDS for all the BAD movie products Hollywood
    never gave us refunds for in the past"
    RichA, Aug 29, 2005
  8. Rich

    eawckyegcy Guest

    RichA once again proves he is an intellectually dishonest dweeb:
    The fact that you pick and choose your facts. Either the plastic
    cameras are (a) stronger, (b) weaker or (c) the same strength as metal
    ones. Evidence in hand shows they are the same, and we know why this
    is so by simple appeal to well established physical/engineering
    principles (the "materials" stuff that Brian Baird was referring to).

    If they can take the "same punishment", then the issue is moot and your
    entire 'argument' collapses. Of course, now that BB points this out,
    you take the dishonest route and disclaim your previous statements.
    Why do you refuse to think? Why are you a FUDster? What is the point?
    Is being stupid _fun_ for you?
    You did, but now you don't. What are your goal-posts made of? Must be
    pretty light, given how fast you move them around.
    eawckyegcy, Aug 30, 2005
  9. Rich

    Brian Baird Guest

    No, they use titanium and aluminum over STEEL because it is LIGHTER.

    Additionally, you misunderstand a simple statement. Which is typical
    with you.
    That's why metals don't offer advantages over plastics in many cases,
    Brian Baird, Aug 30, 2005
  10. Rich

    Darrell Guest

    Maybe Zenit will make a Foveon dSLR out of cast iron boiler plate, hot
    rivetted and welded for extra strength. ;)

    A 9 story fall the camera would be travelling at about 90-95 mph when it
    Darrell, Aug 30, 2005
  11. Rich

    mark Guest

    Darrell schreef:
    huhhuh, wel said beavis...
    mark, Aug 30, 2005
  12. Rich

    Larry Lynch Guest

    If wind resistance is equal, a plastic camera would hit at the same
    speed, so why include the speed, unless you think gravity works
    differently on different materials??
    Larry Lynch, Aug 30, 2005
  13. Rich

    Brian Baird Guest

    Because a feather floats to the ground! Huzzah!

    Brian Baird, Aug 30, 2005
  14. Rich

    Larry Lynch Guest

    Because of resistance to air, not due to a "different" gravitational
    Larry Lynch, Aug 30, 2005
  15. Rich

    Darrell Guest

    My point was at 95mph impact would destroy any camera... IMHO
    Darrell, Aug 30, 2005
  16. Rich

    JPS Guest

    In message <>,
    If two objects are shaped the same, but one is denser than the other,
    the less dense one will be held back more by air resistance.

    Think two boxes that are the same, but one is empty and the other is
    filled with rocks.
    JPS, Aug 30, 2005
  17. Rich

    JPS Guest

    In message <>,
    .... but air resistance is not directly related to shape; mass is a
    parameter as well.
    JPS, Aug 30, 2005
  18. Rich

    Brian Baird Guest

    I know. I was being facetious.
    Brian Baird, Aug 31, 2005
  19. Rich

    Brian Baird Guest

    But then compare a box of lead versus the box of rocks.

    Air resistance is a diminishing effect. Once an object gains enough
    momentum, more isn't going to make as drastic a difference.

    In any case, let's just say the entire thing happens in a vacuum.
    Brian Baird, Aug 31, 2005
  20. Rich

    RichA Guest

    Aluminum alloys (typically) have five TIMES the strength of plastic
    and s/s has TEN times the strength of plastic. Look it up.

    "Bittorrents are REFUNDS for all the BAD movie products Hollywood
    never gave us refunds for in the past"
    RichA, Aug 31, 2005
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