8x10/300mm lens - 35mm focal length equivalent?

Discussion in 'Large Format Cameras and Accessories' started by Colin Corneau, Nov 16, 2009.

  1. Colin Corneau

    Colin Corneau Subscriber

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    Title says it all...I'm just starting out with the big boy and wondered
     
  2. David A. Goldfarb

    David A. Goldfarb Moderator Staff Member Moderator

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    It's usually considered a normal lens--use it like you would a 50mm on a 35mm camera, or thereabouts. Since the shape of the frame is different, there really aren't "equivalents."
     
  3. sepiareverb

    sepiareverb Subscriber

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    This might help give you an idea of FOV 'equivalents'.
     
  4. Denis R

    Denis R Member

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    44mm 50*

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  5. Greg Davis

    Greg Davis Member

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    A lens with a focal length of 45mm is closest with 50mm being runner up.
     
  6. Christopher Walrath

    Christopher Walrath Member

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    Wirelessly posted (BBBold: BlackBerry9000/4.6.0.297 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102 UP.Link/6.3.0.0.0)

    Yup, widish normal lens focal length.
     
  7. df cardwell

    df cardwell Subscriber

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    If you are making an 8x10 from the 35mm, a 300mm is like a 38mm.

    If you are making a 6.3 x 9.5 (an 8x10 neg counting the border) the 300 is like a 45mm on 35.

    In any case, between a 35mm and 50mm.

    A classic 2 lens outfit for 8x10 has been a 10" and either a 14" or 19".
     
  8. Mike1234

    Mike1234 Inactive

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    Diagonal of 135 is 43.2mm.
    Diagonal of 8x10 is 305mm.
    300/305 = 0.9836
    0.9836 x 43.2 = 42.49mm

    Can't get more precise than that unless you measure the aperture opening of a specific 135 camera and of a specific 8x10 film holder. But DF is right... if you crop 135 to 8x10 that changes the formula.

    Diagonal of cropped 135 is 38.4mm.
    0.9836 x 38.4 = 37.8mm

    So a 35mm lens on a cropped 135 image (24x30mm) is closest to matching a normal (305mm) 8x10 lens and is even closer matching FOV of a 300mm.
     
    Last edited by a moderator: Nov 17, 2009
  9. Bruce A Cahn

    Bruce A Cahn Member

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    mikes got it