Results 1 to 17 of 17

Thread: About Crop-Factor

  1. #1

    Default About Crop-Factor

    I'm a newbie in DSLR, so I would like to ask what is the total length if my camera is a 1.6x crop-factor & I'm using a 300mm lens. So how do u calculate???

    Thanks for all replies.

  2. #2
    Deregistered
    Join Date
    Dec 2002
    Location
    Planet Nikon
    Posts
    21,905

    Default

    Simple. Your len is a 300mm focal length. So of course it's a 300mm focal length.

  3. #3
    Member
    Join Date
    Jul 2004
    Location
    Hong Kong/Singapore/Brisbane
    Posts
    768

    Default

    300 x 1.6
    so it is 480mm

  4. #4
    Deregistered
    Join Date
    Dec 2002
    Location
    Planet Nikon
    Posts
    21,905

    Default

    Quote Originally Posted by latmo
    300 x 1.6
    so it is 480mm
    Nope, it is not. A 300mm len is 300mm, how can it be 480mm? Unless you're using a teleconverter, else the distance remains the same.

  5. #5

    Default

    Quote Originally Posted by latmo
    300 x 1.6
    so it is 480mm
    Nope, its like espn says, a 300mm lens, is a 300mm lens. You don't magically get a longer focal range just because you're using a DSLR. What you do get is the field of view equivalent to a 480mm lens.

  6. #6

    Default

    Yes, Gymrat76 is right. See this for a very good explanation:
    http://luminous-landscape.com/tutori...dslr-mag.shtml

  7. #7
    Member
    Join Date
    Jul 2004
    Location
    Hong Kong/Singapore/Brisbane
    Posts
    768

    Default

    oh i see
    i always thought that DSLR got a free 1.6X zoom lol

  8. #8

    Default

    Quote Originally Posted by Gymrat76
    Nope, its like espn says, a 300mm lens, is a 300mm lens. You don't magically get a longer focal range just because you're using a DSLR. What you do get is the field of view equivalent to a 480mm lens.
    So does that mean tat u will get 480mm when on LCD display or printing out........???

  9. #9
    Member
    Join Date
    Jun 2004
    Location
    West area
    Posts
    1,016

    Default

    i suppose u get an image of 480mm equalvient. only FOV changed, focal length changed.

  10. #10
    Deregistered
    Join Date
    Dec 2002
    Location
    Planet Nikon
    Posts
    21,905

    Default

    Quote Originally Posted by Adzz
    i suppose u get an image of 480mm equalvient. only FOV changed, focal length changed.
    Nope, focal length didn't change, your focal view angle changed.

  11. #11

    Default

    Quote Originally Posted by polo_pro10
    So does that mean tat u will get 480mm when on LCD display or printing out........???
    Is my answer correct???

  12. #12
    Senior Member
    Join Date
    Dec 2003
    Location
    Gim Boon Tai
    Posts
    2,909

    Default

    Nope, it'll still show 300mm.

  13. #13
    Senior Member
    Join Date
    Mar 2003
    Location
    Singapore (SengKang)
    Posts
    2,789

    Default

    The size of the image will be the same as a 480mm lens mounted on a full frame body but the EXIF info of the image will still show as 300mm as it is cropped.
    -Express yourself not in words-
    http://www.majere2sg.com

  14. #14

    Default

    Yup although technically you are not getting a 480mm image, you get what appears to be a 480 mm image. Its similar to the crop tool in photoshop if you could look at it that way...
    My Personal Folio (of random events and things)

  15. #15
    Member
    Join Date
    Jun 2004
    Location
    West area
    Posts
    1,016

    Default

    Quote Originally Posted by espn
    Nope, focal length didn't change, your focal view angle changed.
    oops. typed wrongly. hehe. yea. focal length unchanged. silly me.

  16. #16
    Deregistered
    Join Date
    Dec 2002
    Location
    Singapore
    Posts
    6,601

    Default

    Quote Originally Posted by espn
    Nope, focal length didn't change, your focal view angle changed.
    focal view angle?

    wow, new terminology...

  17. #17

    Default

    Quote Originally Posted by majere2sg
    The size of the image will be the same as a 480mm lens mounted on a full frame body but the EXIF info of the image will still show as 300mm as it is cropped.
    What does EXIF info mean???

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •