5x5" fresnel?

Discussion in 'Large Format Cameras and Accessories' started by EASmithV, Mar 26, 2013.

  1. EASmithV

    EASmithV Member

    Messages:
    1,925
    Joined:
    Aug 22, 2008
    Location:
    Maryland
    Shooter:
    Multi Format
    Hello all,

    I'm looking for a fresnel for my super D, mainly to help "snap" the focus as my eyesight isn't the greatest.
    Would a cheap book reading fresnel give this effect when placed on the GG?
     
  2. Barry S

    Barry S Member

    Messages:
    1,347
    Joined:
    Jan 28, 2007
    Location:
    DC Metro
    Shooter:
    Large Format
    I just cut down a full page magnifier from Staples to use on my Reflex-Primar 9x12 SLR. It brightens up the screen, but it's a little coarse. It's an improvement, but it doesn't "snap" the focus. It would be nice to find something finer, but for $7--it's an inexpensive upgrade. I used a fine-toothed Exacto saw to cut 1/2 way through the fresnel and then snapped the cuts over a table edge.
     
  3. Ken Nadvornick

    Ken Nadvornick Subscriber

    Messages:
    5,047
    Joined:
    Mar 18, 2005
    Location:
    Monroe, WA, USA
    Shooter:
    Multi Format
    I've used an inexpensve $9.95 book reading fresnel placed over the rear GG of an 8x10 with good results. It may not be the perfect solution, but for a quick compositional check it works quite well. And if I should drop it over the cliff, no great loss.

    Ken
     
  4. shutterfinger

    shutterfinger Subscriber

    Messages:
    1,153
    Joined:
    Feb 25, 2013
    Location:
    Mid Peninsul
    Shooter:
    4x5 Format
    Fresnels are for eliminating hot spots from bright objects and opening up the shadows as viewed on the ground glass which may or may not improve focusing and with a loupe makes it more difficult.

    A fresnel placed between the lens and ground glass will cause the focus to shift so that the sandwich has to be repositioned to match the film plane focus.

    A fresnel placed over the viewing side ground glass will make the shadow detail easier to see while eliminating the hot spots to a degree. It may make the overall brightness higher.

    I have successfully used a office supply store fresnel on 4x5 cameras. A fine tooth saw or plexiglass scoring tool can be used to cut the fresnel. When scoring score from the smooth side and score half way through before trying to snap it.

    A pair of 2 to 4 power reading glasses may do more to make focusing easier than a fresnel.
     
  5. Zathras

    Zathras Subscriber

    Messages:
    569
    Joined:
    Nov 9, 2004
    Location:
    SF Bay Area
    Shooter:
    Multi Format
    I agree. I put a cheap fresnel ofer the ground glass of my 2¼ x 3¼ RB Graflex, and that diminished the hot spot. What really made it easier to focus was the fresnel used in combination with a 2x pair of cheap reading glasses.
     
  6. j_landecker

    j_landecker Member

    Messages:
    148
    Joined:
    Apr 18, 2004
    Location:
    Vancouver, B
    Shooter:
    Large Format
    Try this place: 3dlens.com/. I've ordered from them before and their quality is good. They seem to have cut back on their offerings, but something like this might do the trick.