Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,687   Posts: 1,548,614   Online: 1311
      
Page 5 of 6 FirstFirst 123456 LastLast
Results 41 to 50 of 58

Thread: F-stop scale

  1. #41
    marciofs's Avatar
    Join Date
    Jul 2011
    Location
    Freiburg - Germany
    Shooter
    Medium Format
    Posts
    286
    This two images were taken with a 0.420mm pinhole and the same time exposure 25min.

    Do you think the flare is actually UV light. If I use UV filter does it solve this flare problem?

    Click image for larger version. 

Name:	6617196_orig.jpg 
Views:	22 
Size:	38.5 KB 
ID:	68498 and Click image for larger version. 

Name:	3556856_orig.jpg 
Views:	29 
Size:	80.5 KB 
ID:	68497


    And this is from 0.390mm pinhole:

    Click image for larger version. 

Name:	120326_orig.jpg 
Views:	24 
Size:	46.2 KB 
ID:	68499

  2. #42
    marciofs's Avatar
    Join Date
    Jul 2011
    Location
    Freiburg - Germany
    Shooter
    Medium Format
    Posts
    286
    Jeffreyg,

    I am using Ilford exposure calculator and It works very well for me. Thank you.

  3. #43
    TheToadMen's Avatar
    Join Date
    Sep 2012
    Location
    Netherlands, Europe
    Shooter
    Pinhole
    Posts
    1,365
    Blog Entries
    1
    Images
    27
    [QUOTE=marciofs;1495939]This two images were taken with a 0.420mm pinhole and the same time exposure 25min.
    Do you think the flare is actually UV light. If I use UV filter does it solve this flare problem[QUOTE]

    My first guess would be light reflections inside the camera. Did you paint the inside matt black and cover the metal of the pinhole with black tape?
    Or did you take the photo into direct sunlight? I supose you don't have light leaks?
    "Have fun and catch that light beam!"
    Bert from Holland
    my blog: http://thetoadmen.blogspot.nl
    my Linkedin pinhole group: http://tinyurl.com/pinholegroup


    * I'm an analogue enthusiast, trying not to fall into the digital abyss.
    * My favorite cameras: Hasselblad SWC, Leica SL, Leica M7, Russian FKD 18x24, Bronica SQ-B and RF645, Rolleiflex T2, Nikon F4s, Agfa Clack and my pinhole cameras

  4. #44
    marciofs's Avatar
    Join Date
    Jul 2011
    Location
    Freiburg - Germany
    Shooter
    Medium Format
    Posts
    286
    I don't have light leak.

    I covered the metal around the pinhole but a little bite is not covered. Or maybe the larger hole which is curved may reflect the light. I will try to correct it.

    Edited:

    Actually I don't think there is any reflection inside because these photos doesn't have flare:

    Click image for larger version. 

Name:	2966724_orig.jpg 
Views:	17 
Size:	49.1 KB 
ID:	68508 and Click image for larger version. 

Name:	897305_orig.jpg 
Views:	14 
Size:	36.9 KB 
ID:	68509

    This flare seems to come from straight sky light, but none of them were direct from sun light.
    Last edited by marciofs; 05-09-2013 at 02:06 PM. Click to view previous post history.

  5. #45
    NedL's Avatar
    Join Date
    Aug 2012
    Location
    Sonoma County, California
    Shooter
    Multi Format
    Posts
    872
    Images
    15
    I don't know. I have seen something like that when the sun reflected into the pinhole. One of my cameras has a 1/4" drilled hole in the side of a can, and the pinhole is taped inside the can. The edges of the 1/4" hole are shiny, and a glint of sun can reflect directly onto the pinhole. It causes something similar.

    The exposure in the 2nd one looks very good.

    I like UV reflection in the air or mist, but I don't think it could be that strong.

  6. #46
    marciofs's Avatar
    Join Date
    Jul 2011
    Location
    Freiburg - Germany
    Shooter
    Medium Format
    Posts
    286
    It is the same then because what you described your pinhole is the same as I have in my camera.

    Istead of trying to improve this camera I will make a 7x9in one so the contact prints will be nicer.

    Thank you very much for the help. I think I got addicted to it. I just love it.

  7. #47
    SMBooth's Avatar
    Join Date
    Jun 2008
    Location
    Melbourne, North/West
    Shooter
    Multi Format
    Posts
    993
    Images
    7
    Could you explain the stacking of paper in the camera. Are the image showing the fog from this process. Light will pass through a sheet a paper.

  8. #48
    NedL's Avatar
    Join Date
    Aug 2012
    Location
    Sonoma County, California
    Shooter
    Multi Format
    Posts
    872
    Images
    15
    Quote Originally Posted by marciofs View Post
    I think I got addicted to it. I just love it.
    It's so much fun, I love it too! There is something very free and liberating and also magic about making a photograph with no lens. The light goes directly onto the paper--- magic!!

    You may want to check out http://www.f295.org/main/forum/. It is a great forum with a community of people who love pinhole photography.

    Have lots of fun... I predict you will be building one even bigger soon!

  9. #49
    marciofs's Avatar
    Join Date
    Jul 2011
    Location
    Freiburg - Germany
    Shooter
    Medium Format
    Posts
    286
    SMBooth,

    I put black hard paper between them.
    And the last photos I posted I had only the single paper in the camera.

    The fog problem is the same as NedL said he had on his one of his camera.

  10. #50
    Jim Jones's Avatar
    Join Date
    Jan 2006
    Location
    Rural NW Missouri
    Shooter
    4x5 Format
    Posts
    1,819
    Because pinholes are so small it is easy to improvise a very efficient "lens" hood for them. This should eliminate most flare problems when there is a lot of sky around the subject or when the sun is just outside the picture area.

Page 5 of 6 FirstFirst 123456 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin