pictures with cap on

BountyphotographerBountyphotographer Shoot first and ask laterRegistered Users Posts: 413 Major grins
edited November 26, 2012 in Technique
I was light painting this week-end when I noticed hundreds of "stars" all over my shot.
The funny thing is that night it was cloudy and stars couldnt be seen.
I then put the cap over the lens took a pictures for 2 minutes (bulb) and notices the same "stars"
Is this some kind of noise/pixels???????????????????

Since I rarely do night photography this is the first time that I see that, during day light the camera is just fine.

Bounty
:photo

Comments

  • pathfinderpathfinder Drive By Digital Shooter western IndianaSuper Moderators Posts: 14,601 moderator
    edited November 19, 2012
    Sounds like it if you see it with the lens cap on the camera when shooting.

    Long time exposures, > 30 seconds, tend to display noise on digital cameras, unless you do a dark frame noise reduction with the camera. But I rarely do dark frame noise reduction as it takes as long as the original exposure, and it can usually be taken care of later in software by some means.
    Pathfinder - www.pathfinder.smugmug.com

    Moderator of the Technique Forum and Finishing School on Dgrin
  • BountyphotographerBountyphotographer Shoot first and ask later Registered Users Posts: 413 Major grins
    edited November 19, 2012
    pathfinder wrote: »
    Sounds like it if you see it with the lens cap on the camera when shooting.

    Long time exposures, > 30 seconds, tend to display noise on digital cameras, unless you do a dark frame noise reduction with the camera. But I rarely do dark frame noise reduction as it takes as long as the original exposure, and it can usually be taken care of later in software by some means.


    Thats what I was afraid of ,however it looks pretty cool
    :photo
  • pathfinderpathfinder Drive By Digital Shooter western IndianaSuper Moderators Posts: 14,601 moderator
    edited November 19, 2012
    There are numerous PS plug ins to add back the grain that has been removed from the change from film to digital imagery.ne_nau.gif
    Pathfinder - www.pathfinder.smugmug.com

    Moderator of the Technique Forum and Finishing School on Dgrin
  • angevin1angevin1 Performs as designed Registered Users Posts: 3,403 Major grins
    edited November 20, 2012
    Thats what I was afraid of ,however it looks pretty cool
    dood, if you like it...heh: freebie! ENjoy it!
    tom wise
  • dbddbd Fool on the hill Registered Users Posts: 216 Major grins
    edited November 24, 2012
    angevin1 wrote: »
    dood, if you like it...heh: freebie! ENjoy it!

    Does this mean we can start 'discussing' whether my camera brand has prettier noise than another's camera brand?

    Dale B. Dalrymple
    "Give me a lens long enough and a place to stand and I can image the earth."
    ...with apology to Archimedies
  • pathfinderpathfinder Drive By Digital Shooter western IndianaSuper Moderators Posts: 14,601 moderator
    edited November 26, 2012
    Or what plug ins can emulate the background noise the best?
    Pathfinder - www.pathfinder.smugmug.com

    Moderator of the Technique Forum and Finishing School on Dgrin
  • shawncshawnc shawnc Registered Users Posts: 659 Major grins
    edited November 26, 2012
    I would ask, is it really noise you are seeing? or are you seeing some hot pixels? I have a 5d and have shot some long exposures where, yes I did havesome noise, but I also had some "stars" showing up in my shots. I did call canon and they said in some cameras I can experience some "Hot Pixels" on long exposures. I have never really done anything to correct the issue in my camera except in post. So I have no resolution to a hot pixel, but it may be something to research for a fix.
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