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Sub-mirrors on DSLRs

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    cnooba
    cnooba e2 Member 183 forum postscnooba vcard Ireland
    24 Apr 2013 - 3:18 PM

    Hi
    I joined a digital camera photography class a few weeks ago. All was going well until we got to looking at the inside of a camera, and how it works. I’m fairly okay with most of it except for the “Sub mirror” If I understand it correctly there are 2 mirrors – the main mirror which remains down and sends the image to the screen or viewfinder and slides upwards when the shutter release is pressed (I think, please correct me if I’m wrong) but what does the “Sub-mirror” do.
    I would really appreciate any help.
    Thank you in advance
    Cnooba

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    snapbandit
    24 Apr 2013 - 3:27 PM

    some of the light/image coming into the camera travels through a semi-transparent section of the main 'viewfinder' mirror to a secondary mirror which reflects it to the autofocus sensor.
    here is a link to how it is used

    cnooba
    cnooba e2 Member 183 forum postscnooba vcard Ireland
    24 Apr 2013 - 6:23 PM

    Thank you very much, that is a huge help and makes it much more understandable. Smile

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