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Thread: Problems with sharpness

  1. #1

    Join Date
    Jan 2021
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    28

    Problems with sharpness

    I could use a bit of advice - I have a chamonix 45n-1 and a caltar-n 1:5.6 150mm lens.
    I just seem to be not getting the clarity of detail I'd like - the focus lacks the sharpness I'm after...and I'd like some advice/feedback


    on the ground glass, the image/image area does seem to be sharp but when developed and scanned, i look at it and it just isn't really sharp.

    i use d76 1:1 with hp5 rated 400 usually.

    i've attached an image

    the problem i know is most likely me
    Attached Thumbnails Attached Thumbnails 000.jpg  

  2. #2

    Join Date
    Sep 1998
    Location
    Buford, GA
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    13,997

    Re: Problems with sharpness

    Quote Originally Posted by Crown-LF View Post
    I could use a bit of advice - I have a chamonix 45n-1 and a caltar-n 1:5.6 150mm lens.
    I just seem to be not getting the clarity of detail I'd like - the focus lacks the sharpness I'm after...and I'd like some advice/feedback


    on the ground glass, the image/image area does seem to be sharp but when developed and scanned, i look at it and it just isn't really sharp.

    i use d76 1:1 with hp5 rated 400 usually.

    i've attached an image

    the problem i know is most likely me
    Or an improperly installed ground glass.
    Take a yardstick. Prop it up at a 45 angle.
    Focus carefully on the middle of the yardstick. See if the sharpest point on the film is at the spot you focused on or is it in front or behind that spot.
    You are using a quality, adjustable loupe to focus?

  3. #3

    Join Date
    Jul 2006
    Location
    Collinsville, CT USA
    Posts
    1,930

    Re: Problems with sharpness

    Improperly installed fresnel lens (in front of the GG?) - happened to me once when cleaning and rebuilding a Nikon Multiphot
    One of the groups of lens elements not OEM for a Caltar-n 1:5.6 150mm lens - Over the years I had acquired two lenses with this problem
    OEM installed shims removed from lens - hard to determine this
    This may sound obvious but once I acquired a lens that the front and rear groups of elements were mounted in reverse
    Echoing Bob's "You are using a quality, adjustable loupe to focus?" Adjustable focus is not set correctly for viewing a GG
    Please let us know what the problem was... "mistakes are teachers in disguise"
    Good luck

  4. #4

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    8,182

    Re: Problems with sharpness

    Another possibility. Scanner. If you want to evaluate a negative, look at it with the help of a loupe.

  5. #5
    Nicholas O. Lindan
    Join Date
    May 2006
    Location
    Cleveland, Ohio
    Posts
    295

    Re: Problems with sharpness

    When I first started out with LF I found I was stopping down too much. The image quality really went to hell if I stopped down past f22.
    Darkroom Automation / Cleveland Engineering Design, LLC
    f-Stop Timers & Enlarging meters http://www.darkroomautomation.com/da-main.htm

  6. #6

    Join Date
    Jan 2021
    Posts
    28

    Re: Problems with sharpness

    Quote Originally Posted by Bob Salomon View Post
    Or an improperly installed ground glass.
    Take a yardstick. Prop it up at a 45 angle.
    Focus carefully on the middle of the yardstick. See if the sharpest point on the film is at the spot you focused on or is it in front or behind that spot.
    You are using a quality, adjustable loupe to focus?
    I am using a loupe and taking my time to focus, so I am getting frustrated.

    I'll try that experiment to see....If my ground glass isn't properly installed, are there any videos/info on how to correct this? I haven't touched the ground glass since getting the camera a few months ago.

    thanks

  7. #7

    Join Date
    Jan 2021
    Posts
    28

    Re: Problems with sharpness

    Quote Originally Posted by Greg View Post
    Improperly installed fresnel lens (in front of the GG?) - happened to me once when cleaning and rebuilding a Nikon Multiphot
    One of the groups of lens elements not OEM for a Caltar-n 1:5.6 150mm lens - Over the years I had acquired two lenses with this problem
    OEM installed shims removed from lens - hard to determine this
    This may sound obvious but once I acquired a lens that the front and rear groups of elements were mounted in reverse
    Echoing Bob's "You are using a quality, adjustable loupe to focus?" Adjustable focus is not set correctly for viewing a GG
    Please let us know what the problem was... "mistakes are teachers in disguise"
    Good luck
    How can I tell if the fresnel is properly installed?

    And do you mind explaining your statement about 'adjustable focus is not set correctly for viewing a GG'? Just so I can understand better.

    thank you

  8. #8

    Join Date
    Jan 2021
    Posts
    28

    Re: Problems with sharpness

    Quote Originally Posted by nolindan View Post
    When I first started out with LF I found I was stopping down too much. The image quality really went to hell if I stopped down past f22.
    well i suppose i usually stick to f/16 most of the time, sometimes f/22....it's hard though in overcast weather sometimes to find the right settings, if you want a faster shutter speed to capture a scene that has moving elements (tree branches, something swaying in the wind etc.)

  9. #9

    Join Date
    Sep 1998
    Location
    Buford, GA
    Posts
    13,997

    Re: Problems with sharpness

    Quote Originally Posted by Crown-LF View Post
    How can I tell if the fresnel is properly installed?

    And do you mind explaining your statement about 'adjustable focus is not set correctly for viewing a GG'? Just so I can understand better.

    thank you
    It means that you have adjusted the eyepiece of your loupe so it is focused on the grain side of your gg.
    The fresnel is placed with the smooth side facing your eye. Modern cameras place the fresnel on top of the gg, your eye side. Older cameras placed it under the gg. If it is under the gg the focus side of the gg has to be adjusted so it lies on the film plane.

  10. #10

    Join Date
    Dec 2005
    Location
    Los Angeles, CA
    Posts
    5,242

    Re: Problems with sharpness

    Also consider the rest of your gear; Tripod vibration, for example…

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