lens fog

Discussion in 'Photography Beginners' Forum' started by den9, Oct 19, 2009.

  1. den9

    den9 TPF Noob!

    Joined:
    Dec 8, 2007
    Messages:
    572
    Likes Received:
    3
    Location:
    Doylestown, PA
    went out front of my house and did a 1 hour exposure of the stars. i put my lens in a ziplock bag and left it outside in the cold for a half hour, then i took the camera out of the bag and took the shot, came back and hour later to release the shutter and the lens was fogged up. how do i keep it from fogging on long exposures (40 degrees outside)
     
  2. ErectedGryphon

    ErectedGryphon TPF Noob!

    Joined:
    Sep 9, 2009
    Messages:
    333
    Likes Received:
    0
    Location:
    Houston, TX
    Can others edit my Photos:
    Photos NOT OK to edit
  3. Derrel

    Derrel Mr. Rain Cloud

    Joined:
    Jul 23, 2009
    Messages:
    35,456
    Likes Received:
    12,797
    Location:
    USA
    Can others edit my Photos:
    Photos OK to edit
    I would go the absolute other way...pull the battery out of the camera,and then put the camera in the refrigerator to get good and chilled....zip the camera outside really fast,and set it up and make the exposure.
     
  4. ErectedGryphon

    ErectedGryphon TPF Noob!

    Joined:
    Sep 9, 2009
    Messages:
    333
    Likes Received:
    0
    Location:
    Houston, TX
    Can others edit my Photos:
    Photos NOT OK to edit
    You describe Cold Soaking...

    Source: Winter photography tips from Adorama Learning Center
     
  5. den9

    den9 TPF Noob!

    Joined:
    Dec 8, 2007
    Messages:
    572
    Likes Received:
    3
    Location:
    Doylestown, PA
    well i pretty much stuck it in the fridge when it was outside in the cold for over an hour, if i wiped the condensation off the lens would it stay off?
     
  6. KmH

    KmH Helping photographers learn to fish Supporting Member

    Joined:
    Apr 9, 2009
    Messages:
    38,235
    Likes Received:
    5,007
    Location:
    Iowa
    Can others edit my Photos:
    Photos OK to edit
    Not if the dew point was high enough.
     
  7. Flash Harry

    Flash Harry TPF Noob!

    Joined:
    Jun 26, 2006
    Messages:
    1,918
    Likes Received:
    1
    Location:
    Durham, UK
    Can others edit my Photos:
    Photos NOT OK to edit
    Never tried this on a lens but on a m/bike helmet visor a very small amount of washing up liquid smeared over the view area kept the fog at bay when breathing during cold weather riding, and I mean really cold, below zero. H
     
  8. tom123

    tom123 TPF Noob!

    Joined:
    Oct 18, 2009
    Messages:
    32
    Likes Received:
    0
    Did you use a uv filter? If yes, is it possible that you had moisture between the lens and the filter that caused the fog. Generally speaking, when the lens is warmer or exactly as cold as the air around it, you should not get fog.
     
  9. den9

    den9 TPF Noob!

    Joined:
    Dec 8, 2007
    Messages:
    572
    Likes Received:
    3
    Location:
    Doylestown, PA
    if washing up liquid refers to soap that does work, i use it for my shaving mirror, i just dont think i could do that to my lens. im going to try it again tonight.
     
  10. KmH

    KmH Helping photographers learn to fish Supporting Member

    Joined:
    Apr 9, 2009
    Messages:
    38,235
    Likes Received:
    5,007
    Location:
    Iowa
    Can others edit my Photos:
    Photos OK to edit
    Liquid dish soap specifically. One small drop applied with a lens tissue.
     
  11. Josh66

    Josh66 Been spending a lot of time on here!

    Joined:
    Oct 31, 2007
    Messages:
    14,604
    Likes Received:
    1,236
    Location:
    Cedar Hill, Texas
    Can others edit my Photos:
    Photos NOT OK to edit
    That's almost the opposite of what you want to do.

    Set it up outside. No special precautions (except for maybe taking the battery out if it's really cold).

    Let it equalize with the ambient air temperature, then you will be fog free.

    Put it in the bag before going back inside.
     

Share This Page

Search tags for this page
17 40 lens fog
,

cold weather lens fog

,
how to keep camera lens from fogging up during long exposure
,
lens fog humid weather