Results 1 to 9 of 9

Thread: Fresnell lens for Sinar

  1. #1

    Join Date
    Oct 2007
    Posts
    86

    Fresnell lens for Sinar

    I really hate to shoot with lenses shorter than 90mm on my sinar f2 because the image on the focusing screen is so dark. Do you think I should buy a fresnell lens? Is it worth the money?

  2. #2
    Unwitting Thread Killer Ari's Avatar
    Join Date
    Apr 2009
    Location
    Ottawa, Canada
    Posts
    5,515

    Re: Fresnell lens for Sinar

    Yes.
    Or try a new focusing screen.

  3. #3

    Join Date
    Jun 2002
    Posts
    9,472

    Re: Fresnell lens for Sinar

    The Sinar ones are cheap and easy because you pop them on and off, so you get the best of both worlds for focusing. The downside is that they get scratched up by not being integrated with the camera, but so what? Buy a used one that is pre-scratched and don't worry about it.

  4. #4

    Join Date
    May 2006
    Location
    Southlake TX
    Posts
    1,056

    Re: Fresnell lens for Sinar

    Buy a terrible one to get frame. Inserts are fairly cheap, I see the plastic fresnel inserts on eBay $30-50. For some reason the holding frame can cost some $$ to acquire.

    I found a crappy one and polished the begeezus out it it and it's usable.

    B

  5. #5
    lenser's Avatar
    Join Date
    Jul 2007
    Location
    Tim from Missouri
    Posts
    1,697

    Re: Fresnell lens for Sinar

    Or head to an Office Max, Staples, or other such store for a page magnifier (fresnel). I've found them from $less than $2.00 up to just under $11.00 and they have worked fine on both my Agfa and Kodak Master. You do have to do a bit of trimming with something like a jig saw. If they scratch or break, who cares!!
    "One of the greatest necessities in America is to discover creative solitude." Carl Sandburg

  6. #6

    Join Date
    Jun 2002
    Posts
    9,472

    Re: Fresnell lens for Sinar

    Plus One to that.

    It is a shame that so many other cameras have mucked about ground glass registration adjusted to suit only a proprietary fresnel that may or may not be any good. The idea of putting on temporarily on the GG for composition and then removing it for fine focusing works so much better.

    The other nice thing about Sinars is you can replace the ground glass with any thickness glass, it doesn't matter so long as it fits!

  7. #7

    Re: Fresnell lens for Sinar

    The other nice thing about Sinars is you can replace the ground glass with any thickness glass, it doesn't matter so long as it fits!
    Sinar GG's are the best, if you break them you just put them back together again!








  8. #8

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,346

    Re: Fresnell lens for Sinar

    Quote Originally Posted by Frank Petronio View Post
    Plus One to that.

    It is a shame that so many other cameras have mucked about ground glass registration adjusted to suit only a proprietary fresnel that may or may not be any good. The idea of putting on temporarily on the GG for composition and then removing it for fine focusing works so much better.

    The other nice thing about Sinars is you can replace the ground glass with any thickness glass, it doesn't matter so long as it fits!
    Same with all recent 45 Linhofs (30+ years or so). The only requirement is that the ground surface rests on the shims. Just check the placement on that monorail you just sold.

    GG thickness is a problem on a 23 Technika as that uses a different registration system then the 45 cameras and improper installation would result in improper focusing.

  9. #9
    Moderator
    Join Date
    Apr 2009
    Location
    Northern Virginia
    Posts
    5,426

    Re: Fresnell lens for Sinar

    Quote Originally Posted by Mark_Se View Post
    I really hate to shoot with lenses shorter than 90mm on my sinar f2 because the image on the focusing screen is so dark. Do you think I should buy a fresnell lens? Is it worth the money?
    Used Sinar Fresnel accessories are not expensive and cheap enough to be worth trying the experiment.

    I found that for lenses 65mm and shorter, the Sinar Fresnel had too long a focal length, and the corners would be subject to double images and other artifacts that made composition and focusing both impossible. They are fine for a 90, however, though they were designed for normal lenses in the 135-210 range.

    I ended up replacing my Sinar ground glass with a focus screen from Bill Maxwell. It was expensive and worth every penny in ease of viewing with very short lenses. With normal lenses, I can compose and focus in daylight without using a focus cloth.

    Rick "who regularly uses 47 and 65mm lenses" Denney

Similar Threads

  1. Can bellows "stretch" lens?
    By Ken Grooms in forum Cameras & Camera Accessories
    Replies: 19
    Last Post: 25-Oct-2006, 19:35
  2. When to switch to a macro lens?
    By William Mortensen in forum Lenses & Lens Accessories
    Replies: 32
    Last Post: 22-Jun-2006, 08:46
  3. Picking ideal lens and fl, for flat copy work
    By bglick in forum Lenses & Lens Accessories
    Replies: 21
    Last Post: 8-Feb-2006, 21:49

Bookmarks

Posting Permissions

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