Helpful Posts Helpful Posts:  0
Results 1 to 8 of 8

Thread: lens closer

  1. #1
    New Member
    Join Date
    Mar 2013
    Posts
    2

    lens closer

    Pls inform me how I know the lens 300mm for example closer the target or objective.Are there any table for that?
    B.RGDS

  2. #2

    Join Date
    Sep 2012
    Location
    Abuja, Nigeria.
    Posts
    91
    Real Name
    Ife.

    Re: lens closer

    Hello Kareem, could you please rephrase the question. I do not understand.

  3. #3
    New Member
    Join Date
    Mar 2013
    Posts
    2

    Re: lens closer

    If any person asked me the lens 300mm for example,how much this lens enlarge the target?

  4. #4
    dubaiphil's Avatar
    Join Date
    Aug 2012
    Location
    Northampton
    Posts
    1,851
    Real Name
    Phil Page

    Re: lens closer

    Depends how big you print the image!


    Sounds like confusion between multipliers when attributed to point and shoot zoom lenses and mm when talking about DSLR/Medium Format.

    e.g. - a 24mm-70mm lens offers virtually 3x zoom

  5. #5
    New Member
    Join Date
    Apr 2008
    Location
    thurrock essex
    Posts
    1

    Re: lens closer

    Quote Originally Posted by kareem View Post
    If any person asked me the lens 300mm for example,how much this lens enlarge the target?
    As I understand it the human eye is equivalent to 50mm,so 300mm is 6x.

  6. #6

    Join Date
    Aug 2011
    Location
    Leiden, Netherlands
    Posts
    185
    Real Name
    Hero

    Re: lens closer

    Kareem, this link might help you unstand the difference between focal lengths: http://tamron-usa.com/lenses/learnin...comparison.php

  7. #7
    Moderator Dave Humphries's Avatar
    Join Date
    May 2008
    Location
    Windsor, Berks, UK
    Posts
    16,323
    Real Name
    Dave Humphries :)

    Re: lens closer

    Hi Kareem,

    Or are you asking about the closest focus distance between subject (target) and lens front element (objective)?

    Welcome to the CiC forums from ...

  8. #8
    William W's Avatar
    Join Date
    Jan 2009
    Location
    Sraylya
    Posts
    3,964
    Real Name
    William (call me Bill)

    Re: lens closer

    The question appears to me to be about a target being enlarged by a telephoto lens (i.e. as seen in the viewfinder) with respect the view of a ‘standard lens’, for a particular camera’s format.

    For the computation: you divide the Focal Length of the telephoto lens by the Focal Length ‘standard lens’ for the camera’s format.

    i.e.

    A 300mm lens on a 135 format camera (aka “full frame”) such as a Canon 5D, will enlarge the target about 6 times. The ‘standard lens’ is (about) 50mm
    300/50 = 6

    A 300mm lens on an APS-C format camera such as a Canon 50D will enlarge the target about 10 times. The ‘standard lens’ is (about) 30mm
    300/30 = 10

    WW

Posting Permissions

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