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Thread: High speed film for 4x5

  1. #11

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    Re: High speed film for 4x5

    If you REALLY want to push your film with pre-sensitization, try hydrazine dyhydrochloride. It's basically rocket fuel.

  2. #12

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    Re: High speed film for 4x5

    Gas-hypering sure seems like 'photography made difficult'. Probably best to use TMX, TMY, or Acros and see what happens. A good starting point anyway.
    I recall not being able to get good (printable) star trail images in the '80s with Vericolor type L film and an f/8 lens. When I used Tri-X, sometimes I got good results. Things are easier now.

  3. #13

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    Re: High speed film for 4x5

    I'm building my gas-hypering chamber...

    It can be done with a plain piece of steel pipe and a quality high vaccum pump. If vacuum is not very good then one can make more cycles of vacuum + filling with forming gas.

    http://www.astropix.com/html/i_astro.../hypering.html

    There is plenty of information from astronomers !!! thanks to them !!!

    Hypering is a funny adventure... with Acros there is no need about it, but LF Acros is to disappear .


    I disagree that TMY is close to Acros for that...


    We have to remember that shadows have much more LIRF than highlights, so the edge Acros has it is very important to conserve shadow detail, very soon it delivers some 3 stops advantage over TMY in the shadows.


    TMY is very, very far from Acros performance... but this depends a bit on the exposure time, and scene shadow depth...

  4. #14
    8x10, 5x7, 4x5, et al Leigh's Avatar
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    Re: High speed film for 4x5

    Quote Originally Posted by Pere Casals View Post
    We have to remember that shadows have much more LIRF than highlights, so the edge Acros has it is very important to conserve shadow detail, very soon it delivers some 3 stops advantage over TMY in the shadows...
    In astrophotography there are no shadows. Black is BLACK.

    - Leigh
    If you believe you can, or you believe you can't... you're right.

  5. #15

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    Re: High speed film for 4x5

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  6. #16

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    Re: High speed film for 4x5

    Quote Originally Posted by Leigh View Post
    In astrophotography there are no shadows. Black is BLACK.

    - Leigh


    Of course... but OP says "photography at night", so I understand it will be salt flats landscape with star trails, this may have shadows...

  7. #17

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    Re: High speed film for 4x5

    Here's a gorgeous example of Acros at night in a 2 min exposure.

    Be sure to click to enlarge the image to full size!

    https://www.flickr.com/photos/shawnh...7632303105515/

    There are many other examples of LF B&W night images on the site. As well as other excellent 4x5 street photography.

    Here's another "long" Acros night image.

    https://www.flickr.com/photos/shawnh...7628339672271/

    Rich

  8. #18

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    Re: High speed film for 4x5

    The big Tokyo stores still show Acros as available with no limit on quantity in 4 x 5, 8 x 10, 120, and 35mm. I think it should be available for a while yet.

  9. #19

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    Re: High speed film for 4x5

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  10. #20
    jesse1996's Avatar
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    Re: High speed film for 4x5

    That is exactly what I'm going for with my photos o this trip xkaes! I'm planning on taking a coupe in Monument valley as well as out i the salt flats with the mountains occurring the lower 1/3 or 2/3 of the photo. what film did you use to capture the first image?

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