Page 4 of 4 FirstFirst ... 234
Results 31 to 36 of 36

Thread: Anti newton glass history & usage wanted

  1. #31

    Join Date
    Sep 1998
    Location
    GA
    Posts
    12,618

    Re: Anti newton glass history & usage wanted

    Quote Originally Posted by Pere Casals View Post
    Another way is to defocus a bit the image (rotating the focus knob, or changing head height...) for part of the exposure. IMHO it's not the same result than with a soft focus lens, but sure it's also a soft focus effect.

    By experimenting this (defocus in the exposure course) we find that image can grow or shrink when moving focus, delivering different effects, we can also defocus both up and down...
    Some people would call that effect out of focus! True soft focus retains some sharpness.

  2. #32

    Join Date
    Jul 2016
    Posts
    4,313

    Re: Anti newton glass history & usage wanted

    Quote Originally Posted by Bob Salomon View Post
    Some people would call that effect out of focus! True soft focus retains some sharpness.
    It all depends on the share of exposure time the image is in focus, it is a true soft focus image because we have a totally sharp image component and a blurred image component.

    Another control factor is the amount of defocus we provide while exposing the defocus time share.

    With the enlarger method if "sharp time share" is 90% then sure that the print wil also retain a lot of sharpness.

    This can also be easily simulated in Ps, by adjusting the blend of the sharp image layer with a more or less blurred layer.

    But for shure that a soft focus lens is a different thing, because the effect also may depend on the DOF/OOF position of each spot, as corrections work different through focus. IMHO soft focus lenses have a beautiful bokeh vs soft_focus interaction.

  3. #33

    Join Date
    Sep 1998
    Location
    GA
    Posts
    12,618

    Re: Anti newton glass history & usage wanted

    Quote Originally Posted by Pere Casals View Post
    It all depends on the share of exposure time the image is in focus, it is a true soft focus image because we have a totally sharp image component and a blurred image component.

    Another control factor is the amount of defocus we provide while exposing the defocus time share.

    With the enlarger method if "sharp time share" is 90% then sure that the print wil also retain a lot of sharpness.

    This can also be easily simulated in Ps, by adjusting the blend of the sharp image layer with a more or less blurred layer.

    But for shure that a soft focus lens is a different thing, because the effect also may depend on the DOF/OOF position of each spot, as corrections work different through focus. IMHO soft focus lenses have a beautiful bokeh vs soft_focus interaction.
    Of course, changing focus or head height during exposure will also add vibration! Unless, perhaps, if your enlarger has motorized elevation and/or focus.

    A true soft focus lens diffuses the highlights into the shadows, that requires a greater lighting ratio, and lenses like the Imagon also have greater depth of field at the same focal length, distance and aperture.
    Stockings, soft focus attachments or your technique will not give that look.

  4. #34

    Join Date
    Jul 2016
    Posts
    4,313

    Re: Anti newton glass history & usage wanted

    Quote Originally Posted by Bob Salomon View Post
    Of course, changing focus or head height during exposure will also add vibration!
    Yes, but that vibration is irrelevant because the sharp component was already exposed, and the vibration of the blurred component has no effect because that component is blurred anyway.

    Of course we first expose the sharp component and later we defocus, not the reversed order.


    Quote Originally Posted by Bob Salomon View Post
    A true soft focus lens diffuses the highlights into the shadows, that requires a greater lighting ratio, and lenses like the Imagon also have greater depth of field at the same focal length, distance and aperture. Stockings, soft focus attachments or your technique will not give that look.
    Of course, no doubt. A soft focus lens has, in fact, amazing aesthetic nuances that come from the scene 3D, and this may be very difficult to emulate from a yet flat image.

    Also, there is nothing wrong in using other resources, like generating a soft focus with the enlarger or with Ps. IMHO soft focus glass is linked an entire aesthetic culture of inmense value. But if one has a sharp negative then making a soft focus with the enlarger it is a choice, this is just a different creative tool we have.

    To me the Soft Focus glass is clearly a more powerful tool, but we may prefer the other way for a particular situation.

  5. #35

    Join Date
    Sep 2010
    Posts
    535

    Re: Anti newton glass history & usage wanted

    Here's an example of the use of a piece of ANR glass for print manipulation. I held it under the lens, moving it slightly, for about half the print exposure. Notice how the highlights have smeared into the shadows. I have heard this described as "D-Max Glow". I think it can be produced with other diffusion materials, but I liked the effect obtained with my piece of ANR glass, the molded type, with the ANR surface facing up towards the enlarger lens.
    Click image for larger version. 

Name:	Kathy LR.jpg 
Views:	23 
Size:	46.2 KB 
ID:	188877

  6. #36
    Tin Can's Avatar
    Join Date
    Dec 2011
    Posts
    12,839

    Re: Anti newton glass history & usage wanted

    Interesting!
    sin eater

Similar Threads

  1. Anti Newton Glass
    By dbla in forum Digital Hardware
    Replies: 21
    Last Post: 4-Apr-2017, 05:49
  2. Replies: 1
    Last Post: 20-May-2016, 20:37
  3. Newton rings from my anti-newton glass carrier
    By jason1388 in forum Darkroom: Film, Processing & Printing
    Replies: 5
    Last Post: 25-Feb-2010, 18:50

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
  •