Page 1 of 3 123 LastLast
Results 1 to 10 of 26

Thread: USAF-1951 drum scanned?

  1. #1

    Join Date
    Aug 2010
    Location
    Moscow
    Posts
    114

    USAF-1951 drum scanned?

    While I've seen a lot of scans of the USAF-1951 test target from the flatbeds, I'm yet to see any drum scanned. Is there any?

    PS. Of cause I'm ready to read that I do not need it and final print is the only thing that counts.

    Best wishes
    Al

  2. #2
    8x10, 5x7, 4x5, et al Leigh's Avatar
    Join Date
    Dec 2010
    Location
    Maryland, USA
    Posts
    5,274

    Re: USAF-1951 drum scanned?

    High-quality resolution targets are usually chrome on glass.

    They don't bend around a drum.

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

  3. #3

    Join Date
    Aug 2010
    Location
    Moscow
    Posts
    114

    Re: USAF-1951 drum scanned?

    I heard they produce targets on Film to. It looks you are right: it is hard to find one on a film.

    Below is not USAF-1951. It is a rooler for microscope. On a glass. One step is 0.01 mm and made of white and black. So we see 200 different color steps per mm. That makes resolution 5080 dpi and it is resolved by Eversmart Pro. One can read also the numbers.

    Click image for larger version. 

Name:	5000dpi_resolved_Eversmart_pro.jpg 
Views:	116 
Size:	36.1 KB 
ID:	68758

  4. #4

    Join Date
    Sep 2003
    Location
    South Carolina
    Posts
    5,203

    Re: USAF-1951 drum scanned?

    If you have a high resolution chrome on glass target, and a small contact printing frame, you could contact print it on high resolution film. For sharpest results use a point light source at 8-10 feet from the frame.

    The Eversmart Pro has theoretical optical resolution of 3175 spi X 8200 spi. The higher resolution is in the direction of the movement of the CCD. If you scan at more than 3175 spi there will be some interpolation involved.

    Image quality with the Eversmart Pro is on par with a Howtek 4000/4500 scanner. The only down side of the Pro is that you are limited to 8 bit saves. The actual analog to digital conversion is made in high bit (14 bit ) but the file is saved as 8 bit. My work flow with B&W is to scan in RGB, then immediately convert the saved file to 16 bit grayscale before doing any image processing.

    Sandy King
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at Yahoo.
    [url]https://groups.io/g/carbon

  5. #5

    Join Date
    Aug 2010
    Location
    Moscow
    Posts
    114

    Re: USAF-1951 drum scanned?

    Quote Originally Posted by sanking View Post
    If you have a high resolution chrome on glass target, and a small contact printing frame, you could contact print it on high resolution film. For sharpest results use a point light source at 8-10 feet from the frame.
    And I finally did it some years ago. I used imagesetter film and managed to contact copy all the fields (up to 7.6).

  6. #6

    Join Date
    Jul 2016
    Posts
    2,369

    Re: USAF-1951 drum scanned?

    Quote Originally Posted by SURF View Post
    And I finally did it some years ago. I used imagesetter film and managed to contact copy all the fields (up to 7.6).
    This is 5 years later !

    7.6 is 228 lppmm, if the drum could see 7.6 then this is more than effective 12000 dpi. Some drums were advertised at even 11000 dpi, but reaching in practice way less effective performance, perhaps 6000.

    Not a drum, but X5 reaches 6500 dpi with small format film, much less as scan row is wider. So I guess that a 7.6 target should be fine...


    http://www.filmscanner.info/en/Hasse...extightX5.html

  7. #7

    Join Date
    Sep 2003
    Location
    South Carolina
    Posts
    5,203

    Re: USAF-1951 drum scanned?

    One can now purchase a high resolution target on film for use on drum scanners.

    http://www.silverfast.com/show/resol...target/en.html

    Sandy
    http://www.sandykingphotography.com/
    For discussion and information about carbon transfer please visit the carbon group at Yahoo.
    [url]https://groups.io/g/carbon

  8. #8
    Pali K Pali K's Avatar
    Join Date
    Aug 2014
    Location
    MD, USA
    Posts
    1,165

    Re: USAF-1951 drum scanned?

    This is a dry mount test on Heidelberg Tango.


  9. #9

    Join Date
    Jul 2016
    Posts
    2,369

    Re: USAF-1951 drum scanned?

    Quote Originally Posted by Pali K View Post
    This is a dry mount test on Heidelberg Tango.
    It looks 6.5 element, so 101.6 lp/mm, 5161 dpi if using "filmscanner" criterion... http://www.filmscanner.info/es/Aufloesung.html

    If we consider 6.4 then it is 4598dpi...

  10. #10
    Pali K Pali K's Avatar
    Join Date
    Aug 2014
    Location
    MD, USA
    Posts
    1,165

    Re: USAF-1951 drum scanned?

    I agree Pere. Tango is around 4500-5500 DPI depending on the condition of the optical path. My Scanmate 11000 which is rated at 11000 DPI also is around 8000 DPI based on a similar test.

Similar Threads

  1. USAF 1951 test chart in SVG format
    By ramon in forum Digital Hardware
    Replies: 25
    Last Post: 29-Nov-2012, 12:00
  2. Replies: 1
    Last Post: 22-Dec-2011, 18:36
  3. Blue Cast in Drum Scanned Files
    By Eric James in forum Digital Processing
    Replies: 10
    Last Post: 19-Jun-2007, 09:07
  4. 210mm f 3.5 Schneider Xenar - 1951 vintage: sharp?
    By tor kviljo in forum Cameras & Camera Accessories
    Replies: 6
    Last Post: 10-May-2005, 08:17

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
  •