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Thread: Will a good UV filter reduce flare and ghosting?

  1. #1
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    Default Will a good UV filter reduce flare and ghosting?

    For some lenses that is prone to flaring. I am wondering if adding a good UV filter will help to reduce flares and ghosting since stray lights will be reduced.

    Alternatively will adding a CPL / ND filter helps?

    What I am asking is whether there is a substitute to multi-coating of the lens?

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    Senior Member Diavonex's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    You need a lens hood and not filter.

    http://www.cambridgeincolour.com/tut...lens-flare.htm

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    Moderator Octarine's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    Flare is a reflection at the surface of lens elements. How can adding an external piece of glass have any effect on the optical characteristics of the lens elements?
    Blocking stray light is the job of a lens hood. CPL also blocks stray light, right. But that's a different form with different side effects.
    Last edited by Octarine; 23rd February 2011 at 08:14 PM.
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    Senior Member SilverPine's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    Agreed with Diavonex that you need a lens hood to reduce flares, W/O using any filter will help to cut down the ghosting.

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    Canon 5D II, 20-35 f/2.8L, 28-80 f/2.8L, 70-200 f/4L IS, 100-300 f/5.6L, 100 f/2.8 Macro

  5. #5

    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by ManWearPants View Post
    For some lenses that is prone to flaring. I am wondering if adding a good UV filter will help to reduce flares and ghosting since stray lights will be reduced.

    Alternatively will adding a CPL / ND filter helps?

    What I am asking is whether there is a substitute to multi-coating of the lens?
    Adding the filter might even worsen the flares, use a lens hood if you need to reduce the flares.

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    Default Re: Will a good UV filter reduce flare and ghosting?

    What if it is a wide angle lens that only allows for shallow lens hood?

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    Senior Member Diavonex's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by ManWearPants View Post
    What if it is a wide angle lens that only allows for shallow lens hood?
    Minimise flare through composition. Place objects within your image such that they partially or completely obstruct any flare-inducing light sources.

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    Default Re: Will a good UV filter reduce flare and ghosting?

    ok so a good filter will not help even though they claim to have anti reflective coatings, multi layered coatings, etc

    I will experiment and verify.

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    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by ManWearPants View Post
    ok so a good filter will not help even though they claim to have anti reflective coatings, multi layered coatings, etc

    I will experiment and verify.
    A good filter will get less flares and ghostings compared to not-so-good filters.

    A lens with no filter will beat the same lens with a good filter any day.

    Hope this helps.

  10. #10

    Default Re: Will a good UV filter reduce flare and ghosting?

    GND and CPL are more for exposures than flare which has a stronger intensity of light.

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    Moderator daredevil123's Avatar
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    Quote Originally Posted by henry soh
    GND and CPL are more for exposures than flare which has a stronger intensity of light.
    Actually cpl is not really meant to control exposure. It is meant to filter out certain wave directions of light.

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    Moderator Octarine's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by ManWearPants View Post
    ok so a good filter will not help even though they claim to have anti reflective coatings, multi layered coatings, etc
    That only means: the filter will not (or only to a small extend) introduce additional flare. But the flare caused by the lens elements will remain, no matter what filter you put on.
    EOS

  13. #13

    Default Re: Will a good UV filter reduce flare and ghosting?

    Filters, not UV, are used to get the correct exposure.

  14. #14

    Default Re: Will a good UV filter reduce flare and ghosting?

    be careful, certain filters might worsen flare.
    Canon 6D | 24-105L | 17-40L | 50 1.4

  15. #15
    Moderator daredevil123's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by henry soh View Post
    Filters, not UV, are used to get the correct exposure.
    I am sorry. But you are not making any sense.


    The settings on Aperture, ISO and shutter are the things used to get the correct exposure.

  16. #16

    Default Re: Will a good UV filter reduce flare and ghosting?

    GND and CPL also change the colors of the captured image from the real scene due to filtering of the light.
    Last edited by henry soh; 25th February 2011 at 06:14 PM.

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    Senior Member Diavonex's Avatar
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    Default Re: Will a good UV filter reduce flare and ghosting?

    A graduated neutral density filter, is an optical filter that varies the light transmission. It does not change the colour of the captured image.

    It is used to bring an overly-bright part of a scene into the dynamic range of the sensor.

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    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by henry soh View Post
    GND and CPL also change the colors of the captured image from the real scene due to filtering of the light.
    No it doesn't.

    What changes the color may be color casting due to IR (in heavy ND situations), or due to the AWB in the camera.

  19. #19

    Default Re: Will a good UV filter reduce flare and ghosting?

    I think it adjusts the brightness of colors from dark to bright towards a smooth tonal range of colors of the scene which can have uneven colors of hightlights, shadows, or flares.

  20. #20

    Default Re: Will a good UV filter reduce flare and ghosting?

    Quote Originally Posted by henry soh View Post
    I think it adjusts the brightness of colors from dark to bright towards a smooth tonal range of colors of the scene which can have uneven colors of hightlights, shadows, or flares.
    The don't do anything to the colours, thats why they are called neutral, any colour change is not supposed to be there and is a colour cast. ND filters cut off light and allow for longer exposure and GND balance the brightness of the sky and ground so the sky would not be blown out or so that the ground would not be underexposed.

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