HP 4850 out of focus in slide scanning

Discussion in 'Scanners' started by Equinox, Sep 2, 2007.

  1. Equinox

    Equinox Guest

    Hallo!

    I have a HP 4850 and I have bad slide/negative scans. I think it is a focus
    problem.
    I found this post; he explain how to adjust focus, but I do not understand
    how!! I am italian, but I ask you: is it wroten in a correct English?
    Do you understand?

    "Some month ago I bought a HP Scanjet 4890 with the intention to scan my
    slides. The resolution was not what I expected.
    I measured the resolution using the "slanted edge" method ( see some other
    threads in this group ). It looked more like the resolution of a 1200 dpi
    scanner. Got no help from HP support. The reaction to my measurements was
    basically "that's the way it is"
    After some testing I made a guess that it was an "out of focus" problem and
    that the focus position was some mm below the glass plate. So I made the
    decision: "make it or brake it". Opened up the scanner, removed the cylinder
    with the lenses.
    Shorted the cylinder with 1 mm in the end that was closest to the detector.
    That way I had the possibility to adjust focus
    to a "more far" position. Well as it turned out 1 mm was too much but 0.2 mm
    was about right. That moved the focus about 3 mm to a position about 1 mm
    above the glass plate. Just right for my framed slides. It is slightly out
    of focus when scanning images, but I have not any need for max resolution
    with images. One other thing I found is that the focus position is moving
    with temperature, so make any testing with a warmed up scanner. I guess that
    the HP Scanjet 4850 have the same problem."

    Thank you a lot
    E.
     
    Equinox, Sep 2, 2007
    #1
    1. Advertising

Want to reply to this thread or ask your own question?

It takes just 2 minutes to sign up (and it's free!). Just click the sign up button to choose a username and then you can ask your own questions on the forum.
Similar Threads
  1. chuck

    scanning out of focus slides??

    chuck, Jul 22, 2003, in forum: 35mm Cameras
    Replies:
    5
    Views:
    265
    Jim Nason
    Jul 24, 2003
  2. Brian Stirling
    Replies:
    5
    Views:
    291
    Martin Riddle
    Nov 15, 2003
  3. richardsfault

    Slide and negative scanning questions/issues

    richardsfault, Mar 6, 2004, in forum: 35mm Cameras
    Replies:
    8
    Views:
    363
    Matt Clara
    Mar 7, 2004
  4. LAshooter
    Replies:
    0
    Views:
    245
    LAshooter
    Jun 25, 2005
  5. Vincent Bilbo

    HP ScanJet 4850 color issue

    Vincent Bilbo, Nov 6, 2005, in forum: Scanners
    Replies:
    0
    Views:
    662
    Vincent Bilbo
    Nov 6, 2005
Loading...

Share This Page