angle of field using 105mm telephoto lens

Discussion in 'Photography Beginners' Forum' started by AlikH, Jan 23, 2016.

  1. AlikH

    AlikH TPF Noob!

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    Using an old 35 mm SLR camera with 105mm telephoto lens, what is the size and shape of the picture that you get? Does it depend on other factors? Thank you.


     
  2. john.margetts

    john.margetts No longer a newbie, moving up!

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  3. wfooshee

    wfooshee No longer a newbie, moving up!

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    If you're asking for a comparison to modern cameras, it would be exactly the same field of view as a 105 on a full-frame dSLR (D610, D750, etc.) That's why full-frame is called full-frame: it's the same size as the 35mm film frame.

    It would be be about the same field of view as, say, a 70-200 almost all the way back on a crop-factor dSLR (D3X00, D5X00, D7X00.)
     
  4. AlikH

    AlikH TPF Noob!

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    Thank you both. So John, when you say a 35 mm SLR will always produce a 24 mm by 36 mm, do you mean 36 mm width and 24 mm height?
     
  5. Designer

    Designer Been spending a lot of time on here!

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    Yes, that is the size of the sensitized area of the film. The edges where the sprocket holes are does not have any of the light-sensitive emulsion that makes film film.

    The projected image will be larger, and circular in shape, but all that light is simply not part of the image because it doesn't fall on any sensitized area.
     
  6. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Not always. There are 35mm film cameras that are ½-frame.
     
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  7. AlikH

    AlikH TPF Noob!

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    Does that mean that if I showed you an unretouched photo that was claimed to be taken with a 35 mm SLR camera with 105 mm telephoto lens, you could tell from looking at it whether it really was?
     
  8. Designer

    Designer Been spending a lot of time on here!

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    I probably couldn't simply from looking at a photo.

    If you are trying to judge the angle of view of a 105mm lens, you could take a picture with a 35mm camera and a 105mm lens, and compare the unknown with the one that you took as the control.

    Do you mind telling us why you need to know this?
     
  9. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    Well, a 105mm on a full-frame traditional SLR or DSLR will give you approximately a 21 x 14° FOV.
     
  10. AlikH

    AlikH TPF Noob!

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    It pertains to a very old photo. So, Sparky, you're saying that the picture itself would be 21 wide and 14 high? So, in other words, 50% wider than it is tall?
     
  11. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

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    You're mixing up two totally, different units of measurement.

    The FILM NEGATIVE measures 24mm x 36mm (unit of length). The camera/lens combination will record a 14° x 21° portion of the world around it (unit of angular measure).

    You can't just measure an old photo and deduce the focal length used to create it.
     
  12. KmH

    KmH In memoriam Supporting Member

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