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canon 70-300mm lens out of focus

  • 12-07-2010 1:48am
    #1
    varghesedaniel
    Closed Accounts Posts: 2 ✭


    got a new canon 70-300 mm lens for my 7d. while using 58mm polarised filter on the lens, i am not able to focus. tried both auto focus and manual focus.. any suggestions..


Comments

  • #2
    DaireQuinlan
    Registered Users, Registered Users 2 Posts: 6,713 ✭✭✭DaireQuinlan


    varghesedaniel wrote: »
    got a new canon 70-300 mm lens for my 7d. while using 58mm polarised filter on the lens, i am not able to focus. tried both auto focus and manual focus.. any suggestions..

    When you say you can't manually focus, is it because the view is too dark ? Very strange rrgardless. Did you get a linear or circular polariser ? Linky to what you bought ?


  • #3
    zerohamster
    Registered Users, Registered Users 2 Posts: 1,792 ✭✭✭zerohamster


    You need a Circular polariser for most digital cameras as linear polarisers can mess with autofocusing because of the way the light is split with beam splitters as far as I know.


  • #4
    zerohamster
    Registered Users, Registered Users 2 Posts: 1,792 ✭✭✭zerohamster


    also, if the polariser is very low quality then the picture will be blurred and bad quality.
    what happens in manual mode when you are focusing? does the picture just never get sharp?


  • #5
    varghesedaniel
    Closed Accounts Posts: 2 ✭varghesedaniel


    thanks a lot for all the replies.. i have a camlink 58 mm circular polarizing filter which i bought along with the lens.. dont know about the quality of this one.... i cannot focus manually.. the pictures remain blurred... there is enough light passing thru.


  • #6
    DaireQuinlan
    Registered Users, Registered Users 2 Posts: 6,713 ✭✭✭DaireQuinlan


    post up a shot. Polarisers reduce the amount of light by anything up to a couple of stops, so you could be suffering from motion blur. IE your shutter speed is too low.


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