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Thread: Observation on focal length and portrait drawing

  1. #11
    Tin Can's Avatar
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    Re: Observation on focal length and portrait drawing

    Nor is depth of object necessarily obvious with the single 'eye' lens.
    sin eater

  2. #12

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    Re: Observation on focal length and portrait drawing

    Quote Originally Posted by Corran View Post
    Sorry, but you are incorrect. Perspective is the relationship between objects in the frame as seen on a 2D-plane, and these relationships inherently depend on their relative distances from the camera position. Wide-angle "distortion" is an element of perspective, but not the entirety.


    Do some reading:

    https://expertphotography.com/perspe...n-photography/
    Apologies, but it seems inherent to your topic.

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  5. #15
    Corran's Avatar
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    Re: Observation on focal length and portrait drawing

    Are you going to read your own source Bob?
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    All comments and thoughtful critique welcome

  6. #16

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    Re: Observation on focal length and portrait drawing

    Quote Originally Posted by Corran View Post
    Are you going to read your own source Bob?
    Did Bryan. Sorry, after more then 60 years in photography, you are wrong. Photographic perspective changes only with angle.
    That is what they taught us in school and it hasnít changed since then.

  7. #17
    Corran's Avatar
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    Re: Observation on focal length and portrait drawing

    Well that's simply incorrect, regardless of when or where you "learned" it. From your article, defining perspective:

    Our point of view. Or placement of the film/sensor plane in relation to the subject
    Then one can get into the distance from camera to subject(s) and background, as well as angles yes, but angle is NOT the only defining trait of perspective and is tied to camera (film/sensor) position.

    Here, you can watch this demonstration showing changes in perspective relative to lens choice, which entails moving the camera away from the foreground subject as longer lenses are used, affecting the foreground and background perspective:

    https://youtu.be/DGujsKb2e10?t=429

    7:09 if the timestamp doesn't work.

    These relationships, when rendering a 3D scene into a 2D image, is what is defined most commonly as perspective. Read the B&H article for a much better explanation than I can make here in a few words.
    Bryan | Blog | YouTube | Instagram
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  8. #18
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    Re: Observation on focal length and portrait drawing

    One option slightly longer focal lengths (distance) allow is more options to light the subject.

    What you have observed about shapes of subject appearing to change at different distances can be applied to lightning. Mortensen's basic lighting is done with a light in front of the lens. A light closer to the subject will "model" (rending the illusion of volume with shading) different than one at the camera in the same way you have observed that it looks different as you move the camera closer or further. Having the light closer will produce more shadow on the edge of a face that a light further than the lens. Lighting a head-and-shoulders or closeup is relatively easy. I have great respect for people who can light a whole body or more due to the bigger angles of lighting involved.

    https://www.flickr.com/photos/13759696@N02/22395160312/
    and with a 2nd light as well.
    https://www.flickr.com/photos/13759696@N02/22395160312/

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