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Protecting Digital Camera (Canon Powershot SX 50 HS) against Sun burn in.

Discussion in 'Electronic Design' started by Skybuck Flying, Apr 20, 2013.

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  1. Hello,

    I would like to point my Canon Powershot SX 50 HS towards the sky to take
    pictures continously.

    However I am worried that the Sun will eventually shine into the lens and
    then burn the sensor inside the camera (like a magnifieing glass).

    Is there anything that can be done to prevent that from happening ? While
    still maintaining some kind of reasonable image quality ?

    At least during day would be nice... and evening/night would be a bonus ;)

    I think some kind of ring could be attached to the camera
    (Kiwifotos LA-58SX50 Lens Adapter Ring )

    but what else would I need ? Some kind of filter ???

    Bye,
    Skybuck.
     
  2. mike

    mike Guest

    Build yourself a sun tracker and instruct the camera to point
    elsewhere. Or just cover the lens when the sun approaches
    the "burn angle".
     
  3. Jasen Betts

    Jasen Betts Guest

    that's only correct twice a year.

    the annual max is 113.5 - lattitude
     
  4. Martin Brown

    Martin Brown Guest

    Actually no. That is only true at the equinoxes. The altitude of the sun
    at transit varies with the time of year from the nominal equinox
    altitude by +/- 23.5 degrees which is the angle between the Earths
    orbital motion and its axis of rotation. So for your latitude of 36
    degrees the range is 90-36+23.5 = 76.5 summer and -23.5 = 20.5 winter.

    At my latitude of 54.5N the sun gets to only 59 degrees in summer and a
    pathetic 12 degrees in winter. This makes solar power unattractive!

    The definition of the tropics is the region of the Earth where at some
    time of year the sun will be directly overhead at transit.
    Silicon CCDs are fairly robust but continuous sun on one will eventually
    bleach the dyes in the Bayer mask.
    The standard for this is Baader solar film - photographic grade.
    http://www.telescopehouse.com/acatalog/Baader_Astro_Solar_Film_A4.html

    Depends what you are trying to do. Stopping the lens down to a largish
    pinhole should be good enough to avoid damage to a CCD.
    Plenty of people run whole sky cameras but tend to live in very dark
    areas. They seem to survive daytime OK despite having fast lenses and
    180 degree field of view. DIY all sky cameras are gaining popularity:

    http://stargazerslounge.com/topic/121275-diy-all-sky-cam/

    A couple of new serious amateur ones have been launched fairly recently
    although details online are surprisingly scant. Try it with a
    sacrificial webcam and see if it does what you want.
     
  5. josephkk

    josephkk Guest

    It is also correct at two longitudes all year 'round. Plus how much to
    'add' to 90 degrees varies by longitude.

    ?-)
     
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