Results 1 to 7 of 7

Thread: some theory question...help thanks!

  1. #1

    Default some theory question...help thanks!

    question is...

    photo quality wise...when you dig zoom using software

    6x opt zoom @2 meg == 3x opt zoom @4meg

    or

    6x opt zoom @2 meg > 3x opt zoom @4meg

    or

    6x opt zoom @2 meg < 3x opt zoom @4meg


    or it is like orange to apple ???

    thanks for your help

  2. #2
    Senior Member
    Join Date
    Jan 2002
    Location
    Singapore
    Posts
    12,938

    Default

    The accurate one:
    3x opt zoom @4meg ~ 4.2x opt zoom @ 2MP

    resolution ~ area, while optical zoom ~ length.

    you need to take the square root, that is square root of (4/2).
    Check out my wildlife pics at www.instagram.com/conrad_nature

  3. #3

    Default

    But you're assuming one thing, that the lens resolution doesn't change... which isn't true.

    If you optical zoom, you're using the full power of your lens resolution to record the 'zoomed' in the picture.

    When you digital zoom, lens resolution has to be proportionately reduced as well.

  4. #4
    Senior Member
    Join Date
    Jan 2002
    Location
    Singapore
    Posts
    12,938

    Default

    yup, when you "digitally zoom a 4MP ~1.4x, you end up with 2MP left of image data/resolution.
    Check out my wildlife pics at www.instagram.com/conrad_nature

  5. #5

    Default

    Originally posted by mpenza
    yup, when you "digitally zoom a 4MP ~1.4x, you end up with 2MP left of image data/resolution.

    so that is 4.4x @2 mega == 3x @ 4 mega ?

    getting confused ???

  6. #6
    Senior Member
    Join Date
    Jan 2002
    Location
    Singapore
    Posts
    12,938

    Default

    Originally posted by Blankies



    so that is 4.4x @2 mega == 3x @ 4 mega ?

    getting confused ???
    just wondering what do you mean by your initial "equation"? guess the confusion starts from there.....

    what I meant was that if you want to crop 2MP out of a 4MP pic (thereby achieving a zoom effect), the degree of zoom is 1.4x. So, if you took a 4MP using 3x optical zoom, and then you crop the middle 2MP out, the equivalent zoom is 1.4x3 = 4.2x. So, it's something like a 2MP camera with 4.2x optical zoom.
    Check out my wildlife pics at www.instagram.com/conrad_nature

  7. #7

    Default

    Originally posted by mpenza


    just wondering what do you mean by your initial "equation"? guess the confusion starts from there.....

    what I meant was that if you want to crop 2MP out of a 4MP pic (thereby achieving a zoom effect), the degree of zoom is 1.4x. So, if you took a 4MP using 3x optical zoom, and then you crop the middle 2MP out, the equivalent zoom is 1.4x3 = 4.2x. So, it's something like a 2MP camera with 4.2x optical zoom.

    oohhhhh that ar....yuan lai ru chi...

    thanks man ! think i will hold my purchase till photokina over...till exams over...

    PRAYING FOR PRICE TO DROP


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
  •