Gig Posters

Posters: 155629 | Bands: 135552 | Designers: 11512                 
   
       RSS Feeds

Username:   Password: 
Register      

Social Networking Activity                 



 Bands  Designers  New Arrivals  Top Lists  Forums  Buy Posters  Submit  Merch Store  Advertise  Widgets  Help

Results 1 to 9 of 9
  1. #1
    Premium Member
    JohnnyJack's Avatar


    Join Date
    Jan 2004
    Location
    Philadelphia
    Posts
    1,741
    Comments
    366

    Default When using sunlight for exposure...

    ... does it have to be direct sunlight?
    Or can I still expose when it is overcast?
    Mitch Hedberg:
    "I'm sick of following my dreams. I'm just going to ask them where they're going and hook up with them later.


    http://johnnyjack.blogspot.com/

  2. #2
    micro's Avatar

    Join Date
    Feb 2005
    Location
    617- chained to a desk.
    Posts
    4,043
    Comments
    90

    Default

    direct would be better.

  3. #3
    uglybogus's Avatar

    Join Date
    Mar 2006
    Location
    Seattle, Washington
    Posts
    830
    Comments
    263

    Default

    good luck. Seems like it would be worth the money to just buy a shoplight and not have to deal with that headache.

  4. #4
    Premium Member
    JohnnyJack's Avatar


    Join Date
    Jan 2004
    Location
    Philadelphia
    Posts
    1,741
    Comments
    366

    Default

    I've done many exposures in direct sunlight.
    But never attempted in overcast.

    I have a homemade exposure unit and a work light but
    I have an over-sized screen to expose and we're not expecting sunlight til Sunday. I was hoping to print Saturday.

    I'm not sure of the exposure time with the work light &
    I don't have time/resourses for a test before I have to print.
    Mitch Hedberg:
    "I'm sick of following my dreams. I'm just going to ask them where they're going and hook up with them later.


    http://johnnyjack.blogspot.com/

  5. #5
    Premium Member
    Andymac's Avatar

    Join Date
    Aug 2003
    Location
    Van Isle BC Canada
    Posts
    11,724
    Comments
    278

    Default

    an indirect exposure will work, but I noticed I lose fine detail because the light bleeds under the film -diffused is the word. by fine I mean dots on 65 line halftone, or 1/2 pt trim marks - they just arent sharp. bold shit is still ok.

    As far as exposure time, if its overcast but direct (and you can still see a shadow) it will be at least double. If you are just exposing to general 'light' it's way longer. I use an integrator, it figures all that out.
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

  6. #6
    Premium Member
    JohnnyJack's Avatar


    Join Date
    Jan 2004
    Location
    Philadelphia
    Posts
    1,741
    Comments
    366

    Default

    Quote Originally Posted by Andymac View Post
    an indirect exposure will work, but I noticed I lose fine detail because the light bleeds under the film -diffused is the word. by fine I mean dots on 65 line halftone, or 1/2 pt trim marks - they just arent sharp. bold shit is still ok.

    As far as exposure time, if its overcast but direct (and you can still see a shadow) it will be at least double. If you are just exposing to general 'light' it's way longer. I use an integrator, it figures all that out.
    Thanks so much, Andy!
    Mitch Hedberg:
    "I'm sick of following my dreams. I'm just going to ask them where they're going and hook up with them later.


    http://johnnyjack.blogspot.com/

  7. #7
    Premium Member
    ImJustRickG's Avatar


    Join Date
    Apr 2006
    Location
    Jet City
    Posts
    2,373
    Comments
    2421

    Default

    How in the WORLD do you know when your exposure time is right?

    "Well, it's 60% chance of rain, so I need to expose for 4 minutes."

    "Partly sunny with hail means expose for 9 minutes."

    WTF?
    Shizouka!

    Brg!

    "I don't know shit about screenprinting and can still tell all the questions you ask are retarded." -Blonde
    I can't imagine being in this position and saying to myself "Hey! I bet the people at Gigposters will be helpful!". -Phoon

  8. #8
    Premium Member
    Andymac's Avatar

    Join Date
    Aug 2003
    Location
    Van Isle BC Canada
    Posts
    11,724
    Comments
    278

    Default

    You think too much Rick! Our problem is living where the sun don't shine every day. Who's fault is that? the stencil?

    straight sun is easy. you could count steamboats. more of a danger of overexposure than anything.

    integrator required for accuracy on cloudy or overcast days.

    BUT - I bet you could still do a decent 'guess' exposure

    I knew some guys in colorado, who did gigantic screens - they just knew by the color change - I think they peeked under the film, or the emulsion changed colour when exposed.
    Andymac

    services www.squeegeeville.com
    equipment www.tmiscreenprinting.com

    Todo es empezar.

  9. #9

    Join Date
    Jan 2008
    Location
    Nashville, TN
    Posts
    18
    Comments
    0

    Default

    Here in central Florida I only use the sun... I lay my screen in the driveway, come inside and open a coke, take a sip, then go back out and get my fully exposed screen. I've had no desire to use the twin 500w work lights I bought...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •