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Thread: Compare Wet Plate to Best LF Film

  1. #11
    Tin Can's Avatar
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    Re: Compare Wet Plate to Best LF Film

    This is not what we do, but interesting

    Graphene Support Films for TEM

    https://www.emsdiasum.com/microscopy...phene_tem.aspx
    sin eater

  2. #12
    Nodda Duma's Avatar
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    Re: Compare Wet Plate to Best LF Film

    Quote Originally Posted by Mark Sawyer View Post
    I may be wrong but I think Daguerreotypes are the highest resolving process.

    Should have quit while we were ahead...
    Lippman plates are generally considered to be the highest resolution, and in fact are so high resolution that they are used for holography.
    Newly made large format dry plates available! Look:
    https://www.pictoriographica.com

  3. #13
    Tin Can's Avatar
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    Re: Compare Wet Plate to Best LF Film

    https://en.wikipedia.org/wiki/Lippmann_plate

    Quote Originally Posted by Nodda Duma View Post
    Lippman plates are generally considered to be the highest resolution, and in fact are so high resolution that they are used for holography.
    sin eater

  4. #14
    Tin Can's Avatar
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    Re: Compare Wet Plate to Best LF Film

    sin eater

  5. #15
    Drew Bedo's Avatar
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    Re: Compare Wet Plate to Best LF Film

    Serious Astronomy imaging was always done on Gglass plates, wety or dry. This may still be the case for some sorts of sky survey projects. The dimensional stability of glass plates is the reason for the continued use of glass well into the film era.
    Drew Bedo
    www.quietlightphoto.com
    http://www.artsyhome.com/author/drew-bedo




    There are only three types of mounting flanges; too big, too small and wrong thread!

  6. #16
    Tin Can's Avatar
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    Re: Compare Wet Plate to Best LF Film

    Evidently KODAK had issues with unavailable chemicals for the best plates as long ago as 2003.

    The below was copied from KODAK PDF found in Internet Archive as early as 2003, document had no date.

    https://web.archive.org/web/20051109...e3/kodak-2.pdf

    Availability of KODAK Astronomical Plates Questionnaire
    For a number of reasons, we currently are unable to manufacture some of the astronomical
    emulsions on glass plates. Our problems are related to certain gelatin formulations which are no
    longer available. We are testing to determine alternate sources of supply, but progress is not
    promising. We may be able to improve the situation slightly after testing for a period of 6 to 8
    months. In other cases it is doubtful that we will be able to make the emulsions at all.
    The situation is particularly crucial since we believe that some of the ingedients we don't
    know which without an extensive research program that these products cannot support were
    responsible for the sensitivity of the plates.
    The plates that we are currently having difficulties with are:
    KODAK Spectroscopic Plate, Type 11a-0
    KODAK Special plate, Type 156-01/02 (formerly Ila-D)
    KODAK Special plate, Type 157-01/02
    KODAK Spectroscopic Plates, Type 103a-O, 103a-F, 103a-G, and 103a-D
    KODAK Special Plate, Type 098-01/02/04
    KODAK Spectroscopic Plates, Type 649-0, 649-F.
    Others that we have had problems with that currently have temporary fixes in place are:
    KODAK Spectrum Analysis Plates, SA-1
    KODAK Spectroscopic Plate, Type Illa-J
    KODAK Spectroscopic Plates, Type Illa-F.
    Gordon P. Brown
    Coordinator: Scientific Products
    KODAK
    sin eater

  7. #17
    Bill
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    Re: Compare Wet Plate to Best LF Film

    Collodion processes can resolve upwards of 10,000 lp/mm. Far above any standard gelatin film.

    Click image for larger version. 

Name:	IMG_20200629_0001.jpg 
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Size:	97.0 KB 
ID:	205289

    Image source: "Microphotography: Photography and Photofabrication at Extreme Resolutions" by G. W. W. Stevens. The image is originally from a paper by the names mentioned in the caption, but I have only been able to find references to it and not its actual content.

    Another image in this book that may be relevant:

    Click image for larger version. 

Name:	IMG_20200629_0002.jpg 
Views:	23 
Size:	46.1 KB 
ID:	205290

  8. #18
    Tin Can's Avatar
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    Re: Compare Wet Plate to Best LF Film

    sin eater

  9. #19
    Tin Can's Avatar
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    Re: Compare Wet Plate to Best LF Film

    Bill, looks like one copy is available

    I will wait a bit in case you want it

    https://www.abebooks.com/servlet/Boo...et-_-bsk-_-bdp

    Quote Originally Posted by Bill Rolph View Post
    Collodion processes can resolve upwards of 10,000 lp/mm. Far above any standard gelatin film.

    Click image for larger version. 

Name:	IMG_20200629_0001.jpg 
Views:	27 
Size:	97.0 KB 
ID:	205289

    Image source: "Microphotography: Photography and Photofabrication at Extreme Resolutions" by G. W. W. Stevens. The image is originally from a paper by the names mentioned in the caption, but I have only been able to find references to it and not its actual content.

    Another image in this book that may be relevant:

    Click image for larger version. 

Name:	IMG_20200629_0002.jpg 
Views:	23 
Size:	46.1 KB 
ID:	205290
    sin eater

  10. #20
    Bill
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    Re: Compare Wet Plate to Best LF Film

    I appreciate the gesture, but I already have the book. It was the specific paper by Mollenstedt and Spiedel that I couldn't find. The book is excellent and I highly recommend it, but if it just the resolution of collodion that concerns you I can scan the relevant pages and send them to you (or anyone else interested). The majority of the book covers silver gelatin emulsions and the technique of microphotography - there are only a couple pages about collodion.

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