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Thread: Air coming out from viewfinder - Normal or not?

  1. #1

    Default Air coming out from viewfinder - Normal or not?

    I have a 70-300 zoom lens and whenever i zoom in/out, i feel a gush of air coming out from the viewfinder...is this normal or something wrong with my lens or cam?

    Thanks!

  2. #2

    Default Re: Air coming out from viewfinder - Normal or not?

    It's the first time I hear of air coming out from the viewfinder.. something doesn't sound right Are you sure it's not from 'around the viewfinder' instead?

  3. #3
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    Default Re: Air coming out from viewfinder - Normal or not?


    It's certainly not right..IMO..
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  4. #4

    Default Re: Air coming out from viewfinder - Normal or not?

    This is normal. Some lenses when zooming, suck in and push out quite alot of air. This is especially evident for lenses that extend its length by alot when zoomed. When you zoom out, the air goes in. When you zoom back in, the air has got to go somewhere and it does go through the viewfinder especially for some cameras where the penta prism is not completely sealed.

    Ken Rockwell calls it eye blow. An example is here: http://www.kenrockwell.com/canon/len...mm-is.htm#perf . Click on eyeblow.

    The only problem with this is that it can be irritating if you've sensititive eyes, and it also means dust will get sucked in and blown into the VF more frequently.
    Last edited by JoshSiao; 9th September 2007 at 10:40 PM.
    5D MII w/16-35L,Sigma 28-70&Nikkors(35f2,85f1.4,105f2.5,180f2.8ED)

  5. #5
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    Default Re: Air coming out from viewfinder - Normal or not?

    It's normal, especially with long zooms and a wider VF. The air in the lens has to go somewhere

  6. #6

    Default Re: Air coming out from viewfinder - Normal or not?

    Thanks to all for the comments!

  7. #7
    Member/Tangshooter Redsun's Avatar
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    Default Re: Air coming out from viewfinder - Normal or not?

    cool!I never realise theres something like this
    muz go try

  8. #8
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    Default Re: Air coming out from viewfinder - Normal or not?

    learn something new.

  9. #9
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    Default Re: Air coming out from viewfinder - Normal or not?

    wow... later eyelashes kenna suck in and stuck to sensor
    Dreaming... 14mm f2.8, 16-35 f2.8 mkII, 85 f1.2 mkII

  10. #10
    Member/Tangshooter Redsun's Avatar
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    Default Re: Air coming out from viewfinder - Normal or not?

    Quote Originally Posted by gryphon View Post
    wow... later eyelashes kenna suck in and stuck to sensor
    then you'll have a digital single lens reflex eye!!

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