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Thread: Can someone explain lens compression in a newbie manner?

  1. #1
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    Default Can someone explain lens compression in a newbie manner?

    I google lens compression and i read the technical vs the layman explanation.
    sadly, i am still dont get it...

    in fact on one website, as i was about to understand how it works - someone commented that the fundamentals from the website owner was wrong... (hahha)

    perhaps can some kind souls in CS can explain it? Singaporean style perhaps...

    thanks in advance
    http://www.EdmundPhoto.com
    for Weddings, Family Portraits, Executive Portraits, etc

  2. #2
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    Default Re: Can someone explain lens compression in a newbie manner?

    You keep your subject height / size the same in the viewfinder at where you're standing with a 50mm.

    You zoom in and move backwards, the background slowly becomes slightly bigger in size.

    You zoom out and move forwards, the background slowly becomes smaller in size.



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  3. #3
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    Default Re: Can someone explain lens compression in a newbie manner?

    so does that mean that the more i zoom in (while the subject size remains the same), my back ground objects will get bigger?

    thanks
    http://www.EdmundPhoto.com
    for Weddings, Family Portraits, Executive Portraits, etc

  4. #4

    Default Re: Can someone explain lens compression in a newbie manner?

    yup, background object would appear bigger relative to your subject, its more to do with relative distances though.. cos you're standing further back inorder to make the subject the same size in your viewfinder..

  5. #5

    Default Re: Can someone explain lens compression in a newbie manner?

    at long focal lengths objects appear magnified and closer than they really are.
    I refuse to List my camer@ equipment here.

  6. #6

    Default Re: Can someone explain lens compression in a newbie manner?

    Even though you may be using nikon, this canon website explains it pretty well
    http://web.canon.jp/imaging/enjoydslr/part3/3C.html

  7. #7

    Default Re: Can someone explain lens compression in a newbie manner?

    Quote Originally Posted by Ferderico View Post
    so does that mean that the more i zoom in (while the subject size remains the same), my back ground objects will get bigger?

    thanks
    relatively larger in terms of comparing to something else nearby, in the case of headshotx post, you can use the water bottle as comparison.

    so you can better isolate objects with longer focal lengths.

    by the way, try to discard "zoom" concept, that is from consumer P&S camera, for dslr, there is no room for a zoom concept, the focal length and field of view is the way to think

  8. #8
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    Default Re: Can someone explain lens compression in a newbie manner?

    Quote Originally Posted by night86mare View Post
    so you can better isolate objects with longer focal lengths.
    Err... am a little confused. Isn't a shorter focal length (i.e. more "zoomed out") better for isolating? Coz to me the red/pink water bottle stands out more at 18mm than at 55mm in headshotzx's post. Or did I get the concept of "isolation" wrong?

  9. #9

    Default Re: Can someone explain lens compression in a newbie manner?

    Quote Originally Posted by arctos View Post
    Err... am a little confused. Isn't a shorter focal length (i.e. more "zoomed out") better for isolating? Coz to me the red/pink water bottle stands out more at 18mm than at 55mm in headshotzx's post. Or did I get the concept of "isolation" wrong?
    18mm got wall, got switch, got wires

    55mm only have 2 bottles + part of switch + wall

    which is cleaner?

    usually longer focal lengths isolate subject better.

    for example, think of a bird amidst tree canopy at 20mm, versus same bird at 500mm.

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