Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,500   Posts: 1,543,316   Online: 922
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1

    Join Date
    Jun 2004
    Location
    North Orange County, Southern California
    Shooter
    4x5 Format
    Posts
    249

    12x20 Viewing Card

    I was thinking about a viewing card, much like the ones for 4x5, to use with my 12x20 camera. Holding a large card with a 12x20 cutout is a bit too much so I decided to scale it down. I divided each dimension by 4 and came up with an 8x10 card, easy to carry, with a 3x5 cutout. Now my problem is how close or far away do I need to hold it from my eye to approximate the correct composition. I have a 610mm lens and a 450 lens.

    Any suggestions?

    Thanks

    Gary
    "He who expecteth nothing,
    Shall not be disappointed." Robert Willingham, 1907

  2. #2
    scootermm's Avatar
    Join Date
    Jun 2004
    Location
    Austin, TX
    Shooter
    ULarge Format
    Posts
    1,867
    Images
    235
    gary, the gut reaction answer would be:
    4.5" away from your face for the 450mm lens
    6" away from your face for the 600

    basically thats going with the focal length being the distance from film plane to the lens center... 450mm/4 = 112.5mm = 4" 600mm/4=150mm = 6"
    likely not EXACT but close enough I would think.

  3. #3

    Join Date
    Mar 2003
    Location
    Greenville, SC
    Shooter
    Large Format
    Posts
    4,813
    Images
    5
    Quote Originally Posted by Gary892 View Post
    I was thinking about a viewing card, much like the ones for 4x5, to use with my 12x20 camera. Holding a large card with a 12x20 cutout is a bit too much so I decided to scale it down. I divided each dimension by 4 and came up with an 8x10 card, easy to carry, with a 3x5 cutout. Now my problem is how close or far away do I need to hold it from my eye to approximate the correct composition. I have a 610mm lens and a 450 lens.

    Any suggestions?

    Thanks

    Gary

    My viewing card for 12X20 is 6X10 inches, or 1/2 the dimension of the format. Proper viewing distance for this card is 1/2 the focal length of the taking lenses. For example, if you are using a 600mm lens place the card 300mm from your eyes.

    One trick you might want to consider is to attach a nylon cord to the viewing card, with a knot in the cord at the proper distance for every focal length you own. To view, place the knot between your teeth and hold the card centered away from your face, and level on both axis.

    Sandy King
    Last edited by sanking; 11-21-2007 at 04:48 PM. Click to view previous post history.

  4. #4
    MattKing's Avatar
    Join Date
    Apr 2005
    Location
    Delta, British Columbia, Canada
    Shooter
    Multi Format
    Posts
    12,370
    Images
    60
    Quote Originally Posted by sanking View Post
    One trick you might want to consider is to attach a nylon cord to the viewing card, with a knot in the cord at the proper distance for every focal length you own. To view, place the knot between your teeth and hold the card centered away from your face, and level on both axis.

    Sandy King
    In which case, you are bound to be asked the question .....

    "Is that a Hasselblad?"

    (Sorry, I couldn't resist)

    Matt

    P.S. The cord and card sound like a great idea for other formats too.

  5. #5
    Robert Hall's Avatar
    Join Date
    Aug 2004
    Location
    Lehi, Utah
    Shooter
    ULarge Format
    Posts
    2,040
    Images
    28
    Make sure you dip the cord in something that tastes good.
    Robert Hall
    www.RobertHall.com
    www.RobertHall.com/mobile
    Apug Portfolio
    Facebook Profile


    Technology is not a panacea. It alone will not move your art forward. Only through developing your own aesthetic - free from the tools that create it - can you find new dimension to your work.

  6. #6
    Steve Smith's Avatar
    Join Date
    May 2006
    Location
    Ryde, Isle of Wight
    Shooter
    Medium Format
    Posts
    8,594
    Images
    122
    Quote Originally Posted by Robert Hall View Post
    Make sure you dip the cord in something that tastes good.
    Or use dental floss!


    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  7. #7

    Join Date
    Mar 2005
    Location
    Vermont
    Shooter
    Large Format
    Posts
    75
    Set the camera up and focus look at the ground glass for referenece points. Then look through the viewing card when you find the correct distance from your eye to match what you see on the ground glass. Take a string and attach it to the card and then tie a knot in it at the correct distance.

  8. #8

    Join Date
    Jul 2003
    Location
    Texas
    Shooter
    Multi Format
    Posts
    3,576
    Images
    27
    Thanks Richard, very easy way to work. One for the notebook.
    Mike C

    Rambles

  9. #9

    Join Date
    Jun 2004
    Location
    North Orange County, Southern California
    Shooter
    4x5 Format
    Posts
    249
    Lots of great suggestions.

    I made a card using Sandy's suggestion about the dimensions.

    I am going to make two pieces of cord, one following what Sandy said and one following what Richard said. I'll then decide which method works best for me.

    Thanks to everyone for replying.

    Gary
    "He who expecteth nothing,
    Shall not be disappointed." Robert Willingham, 1907

  10. #10
    noseoil's Avatar
    Join Date
    Oct 2003
    Location
    Tucson
    Shooter
    Multi Format
    Posts
    2,898
    Images
    17
    Gary, use 1/4 the FL and you will be fine.

    I made a similar viewing device for 4x5. Basically, it uses the same "window" size in the 4x5 format, but is a simple brass rod bent into a rectangle. There is a length of brass strap (hobby shop stuff, somewhat soft, but it works), a wood block with a brass tube epoxied in place and scored marks on the brass strap. A friction fit is all that is needed. Since the 4x5 aspect ratio is 1:1 in this case, I have marks at 65mm, 90mm, 125mm, 180mm, 240mm and 300mm is full extension.

    To use this device for 8x10, I use 1/2 the focal length or just under 125mm for the 240mm G-Claron from "the little green men" lens (thanks Jim), 150mm for the 300mm and 240mm for the 480mm lens. tim

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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