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ND 3 filter Safe with the sun ?

  • 16-09-2013 10:01am
    #1
    the_monkey
    Closed Accounts Posts: 6,556 ✭✭✭


    I'm almost certain it is, but what about taking direct shots of the sun with an ND 3.0 filter (10 stop reduction of light)

    can it damage the sensor if it's a second or 2 exposure with a midday sun ?


Comments

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


    Does it block UV/IR as well as visible light ?


  • #3
    the_monkey
    Closed Accounts Posts: 6,556 ✭✭✭the_monkey


    DaireQuinlan wrote: »
    Does it block UV/IR as well as visible light ?

    I'll need to look into that ...

    still not sure this is the filter :
    http://www.bhphotovideo.com/c/product/752927-REG/B_W_1066177_77mm_110_Solid_Neutral.html


  • #4
    CabanSail
    Moderators, Category Moderators, Arts Moderators, Entertainment Moderators Posts: 9,047 CMod ✭✭✭✭CabanSail


    An ND3 filter would be too weak.

    An ND1024 (with an Optical Density of 3.0) would work


  • #5
    FoxT
    Closed Accounts Posts: 4,204 ✭✭✭FoxT


    The filter linked to above is a 10-stop ND filter. It has an optical density of 3.0, which corresponds to a 10-stop reduction. An ND1024 is the same thing - just uses a different numbering classification.

    Wikipedia gives a good explanation of the different ND classifications, here.

    There is an interesting guide on ND filter usage here, which includes a statement to the effect that digital camera sensors are not sensitive to UV.

    -FoxT


  • #6
    the_monkey
    Closed Accounts Posts: 6,556 ✭✭✭the_monkey


    CabanSail wrote: »
    An ND3 filter would be too weak.

    An ND1024 (with an Optical Density of 3.0) would work

    Seriously !, so sun can still damage the sensor through this ?

    I did some fast shots of the setting sun, but that im sure is fine ....

    Just as well i haven't done any messing with the full sun (purely experimental shots that i want to do).


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  • #7
    FoxT
    Closed Accounts Posts: 4,204 ✭✭✭FoxT


    See Page 19 of this document from B+W .

    On all the graphs shown, the filters cut down UV light (Wavelength <400nm) about 10 times more than they cut out visible light. Since you are metering/exposing to the amount of visible light present, a correctly exposed photo without the filter will, in fact, expose the sensor to MORE UV light than a correctly exposed photo with the filter in place.

    Work away, you'll be grand.

    -FoxT


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