Canon recalling their new EF 24-105 L IS lens because of bizarre lens flare

Discussion in 'Canon' started by Dave R knows who, Oct 22, 2005.

  1. Dave R knows who, Oct 22, 2005
    #1
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  2. Doh! I meant to send this to a friend and posted to the group... info I
    gleaned... from the group.
     
    Dave R knows who, Oct 22, 2005
    #2
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  3. Dave R knows who

    Henry Guest

    Is it a health issue then??????? or a Troll?
    Where is the "official notice"? Does it exist?
    I know the middle "R" stands for ? ? ? ? ? ?

    Any you poets turn the following into a poem ... please.

    Trolling along with his dick in his hand
    and not a thought in his head worth
    talking about.
     
    Henry, Oct 22, 2005
    #3
  4. neat effect if you could get it only when you wanted it.
     
    bob crownfield, Oct 22, 2005
    #4
  5. Dave R knows who

    jpmcw Guest

    Check your newsreader's set up, "Henry", or propagation from your ISP.
    "Dave" posted a correction/explanation a few minutes after he posted
    this in error.
     
    jpmcw, Oct 24, 2005
    #5
  6. Dave R knows who

    Darrell Guest

    Must be a secret recall, because they aren't telling their dealers... My
    vote is TROLL

    Odd how people go out of their way to find a problem that won't occur in the
    real world 99% of the time.
     
    Darrell, Oct 24, 2005
    #6
  7. Dave R knows who

    Angus Guest

    And of course you believed him.
    Can I sell you London Bridge, or maybe just a share in it?

    Angus.
     
    Angus, Oct 24, 2005
    #7
  8. Dave R knows who

    Skip M Guest

    Talked to my dealer about it yesterday, there's something going on, the
    lenses are being withheld from the market.
    But I've had examples of that same lens flare, twice in the last two weeks,
    with my 24-70 f2.8L, so I have a feeling it's something else, besides or
    added to, the lens flare problem.
     
    Skip M, Oct 24, 2005
    #8
  9. Dave R knows who

    Rich Guest

    Oh my GOD! It's the SENSORS!!!!!!!!!!!!!
    Just kidding.
    -Rich
     
    Rich, Oct 25, 2005
    #9
  10. Dave R knows who

    nick c Guest

    I called Canon and was connected to the service center in West Virginia.
    Once connected I had a pleasant discussion with "John" who provided me
    with the following information.

    Canon has issued a service bulletin for the 24-105 f4 L IS lens. The
    24-105 f4 L IS lenses may be subject to significant flare from strong
    light sources entering the lens at an angle of 37.5 degrees. Parts
    availability necessary to correct this condition will be available at
    Canon service centers from Nov.15 onward.

    During the discussion, John said not all 24-105 lenses have this
    abnormal flaring condition and tech service advice to callers is mount
    the lens on a body and test the lens to see if the lens exhibits the
    flaring anomaly. It would be easy to test the lens to see if the
    abnormal flare exists. If it exists, it will be readily seen through the
    view finder if a strong angular light source is used for the test.
    However, if one wants to be certain their lens is not one that needs
    repair, then it's best to have the Canon service center check the lens
    and repair if necessary.

    I mounted my 24-105 lens on my camera then on a tripod. Looking through
    the view finder and using a pen (Double AA battery) flashlight, holding
    the flashlight close to 2 inches (about 5 centimeters) from the lens, I
    conducted my test. Having a strong light source enter my lens (wide
    open) at angularities of varying degrees, at times able to see the
    flashlight bulb, I saw no abnormal flaring as is shown in the examples
    you posted. Shrug ... Could be I lucked out.
     
    nick c, Oct 25, 2005
    #10
  11. Don't try reason and research with these guys. They rather have trolls than
    truths.

    I admit I should have put a question mark at the end of my sentence, because
    there was nothing official from Canon posted to the public. But it was meant
    to be e-mailed to my friend and not here to the group anyway. Sorry again
    all around to those who got their panties in a wad because I used the term
    "recall" and have bad punctuation.
     
    Dave R knows who, Oct 25, 2005
    #11
  12. Dave R knows who

    jpmcw Guest

    I'm sorry; this post is too factual, of reasonable tone, and devoid of
    attacks on others or Canon to really be part of this thread.....
    <s>
    Glad your lens passed the test; do you suppose some element or other on
    the faulty lenses didn't get coated?

    Also, you spelled flare properly. I was getting used to "flair"!
     
    jpmcw, Oct 25, 2005
    #12
  13. Dave R knows who

    nick c Guest

    Honestly, I don't have a clue. However, if a guess is in order, that's
    as good a conclusion as any others I thought about.
    Well now, perhaps I have the flair to recognize flare when I see it. <G>
     
    nick c, Oct 26, 2005
    #13
  14. Dave R knows who

    Rich Guest

    I don't think so. Not coating the lens would not result in the kind
    of defined, streak-like problem you saw in the images. My guess is
    that something sharp (could be anything in the mechanical assembly)
    has been left unblackened and at certain angles is causing what you
    see. Good thing is that it isn't likely the glass.
    -Rich
     
    Rich, Oct 28, 2005
    #14
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