Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: discussions on digital backs

  1. #1

    Join Date
    Oct 2006
    Location
    amstedam netherlands
    Posts
    5

    discussions on digital backs

    a good digital back is like a drum scanner with a lense.how come i don't find any discussions on use of lage format digital backs?

    I started working with Phase one P45 about two years ago. after lots of experience, I notice my working has become equivalent to working previously with large format.

    Anybody who wants to share thoughts on difference in use between digital backs and analog large format camera's?

  2. #2

    Re: discussions on digital backs

    Probably cause most of us here cannot afford a digital back, so no need discussing If I need that kind of resolution, I just mount my 5DII on my nodal head and shoot a quick multi-row pano.Autopano Giga software makes the stitching quick and easy.I have many shots in the gigapixel range that even a P65 couldn't touch, unless of course you shoot the P65 the same way But in the end I still prefer the look of film.If someone wants to give me a large format back though, I'd be willing to discuss it, and put it up against my 8x10 sheet film for comparison

  3. #3
    Kirk Gittings's Avatar
    Join Date
    Mar 2004
    Location
    Albuquerque, Nuevo Mexico
    Posts
    9,712

    Re: discussions on digital backs

    The Phase One P45 is capable of extraordinary detail and subtlety. A truly fine piece of equipment. But a P45 back in and of itself would not be considered large format here and would only be considered for discussion if used if used on a View Camera. Otherwise it is a lounge topic.

    "The purpose of the forum is to provide a place for discussion of topics of particular interest to large format photographers. We especially encourage questions which will help build a repository of knowledge about the tools and techniques of large format photography, as opposed to "shopping" questions. For the purposes of this forum, we define "large format" as being essentially 4x5, or larger, sheet film. We do, however, allow what would otherwise be considered "medium format" sizes, IF exposed in a view camera (e.g. with a roll-film adapter), technical, or old-style press camera (e.g. the various Graphic cameras)."
    Thanks,
    Kirk

    at age 67
    "The woods are lovely, dark and deep,
    But I have promises to keep,
    And miles to go before I sleep,
    And miles to go before I sleep"

  4. #4

    Join Date
    Oct 2006
    Location
    amstedam netherlands
    Posts
    5

    Re: discussions on digital backs

    thank you for your reply mr. Gittings.

    I am too serious to be involved in lounge topics.

    I have struggled with the P45 back since I had it, for two years.
    And however I am not actively involved in creating albumen prints or producing my own glass negatives, I still feel very much connected to the medium.

    My point is that it is not only about the use of chemicals or not, and it is neither a matter of having medium format or 8"x10". It is about how you deal with your camera in relation to the environment in which you create a photographic image.

    That is why I think that this is an appropriate topic to discuss in this chapter(?) "on photogrpahy". I think knowledge on large format photography goes beyond the use of a big camera.

  5. #5

    Join Date
    Jan 2007
    Location
    Minneapolis, MN
    Posts
    1,255

    Re: discussions on digital backs

    Don't feed the trolls.

  6. #6
    Kirk Gittings's Avatar
    Join Date
    Mar 2004
    Location
    Albuquerque, Nuevo Mexico
    Posts
    9,712

    Re: discussions on digital backs

    jtvr,

    Sorry, but those are the policies of the forum. They have been discussed to death on the forum amongst the members and amongst the moderators (including many times recently for both) and are not likely to change anytime soon. The above statement I quoted is the standing policy of the forum now and for the foreseeable future.

    As far as being "too serious" for the lounge.......I "seriously" doubt that you are any more serious than I am and I don't hesitate to post in the lounge when my topic doesn't fit the guidelines for the main forum.
    Thanks,
    Kirk

    at age 67
    "The woods are lovely, dark and deep,
    But I have promises to keep,
    And miles to go before I sleep,
    And miles to go before I sleep"

  7. #7
    Peter De Smidt's Avatar
    Join Date
    Jan 2001
    Location
    Fond du Lac, WI, USA
    Posts
    5,328

    Re: discussions on digital backs

    I've used a Phase back on a Sinar P2. The digital back requires more precise movements than LF film, which explains the need for the P3. The lenses for the digital back need to be wider to give the same image as would be gotten on 4x5 film, and the digital back puts more demands on the lens. In other words, some lenses that work fine with film don't work so well with the digital back. Finally, using tilt and swing can cause color shifts and other issues on the digital backs.
    "Why can't we all just get along?" President Dale, Mars Attacks

  8. #8

    Join Date
    Nov 2010
    Posts
    469

    Re: discussions on digital backs

    Peter, your comments on lenses suitable/unsuitable for use with a P45 caught my attention. Other than lenses manufactured specifically for, can you make a broad statement about which modern coated LF lenses function well with the back? Are there particular lenses which work well for you?

  9. #9
    Moderator
    Join Date
    Apr 2009
    Location
    Northern Virginia
    Posts
    5,074

    Re: discussions on digital backs

    Quote Originally Posted by pdmoylan View Post
    Peter, your comments on lenses suitable/unsuitable for use with a P45 caught my attention. Other than lenses manufactured specifically for, can you make a broad statement about which modern coated LF lenses function well with the back? Are there particular lenses which work well for you?
    I think Peter meant that the smaller format requires shorter lenses, and the greater enlargement ratios require lenses with better performance. The shorter lenses also require finer movements of the camera.

    And digital solutions that use small-format digital bodies place the sensor deep into the camera with respect to the lens to provide room for a reflex mirror. That requires lenses of retrofocus design. Some digital sensors benefit from the retrofocus design even if it isn't mechanically needed, to aim the image light more directly at the sensor sites.

    And digital sensors have different MTF characteristics, and introduce potential aliasing problems. Lenses optimized for digital backs are often designed to provide a different MTF at different spatial frequencies to improve performance with respect to these issues.

    But it is certainly possible to get excellent images using digital backs and conventional high-quality large-format lenses.

    Rick "who wants a 4x5 digital solution, but who can't afford any likely possibilities" Denney

  10. #10

    Join Date
    Sep 1998
    Posts
    10,314

    Re: discussions on digital backs

    Quote Originally Posted by pdmoylan View Post
    Peter, your comments on lenses suitable/unsuitable for use with a P45 caught my attention. Other than lenses manufactured specifically for, can you make a broad statement about which modern coated LF lenses function well with the back? Are there particular lenses which work well for you?
    Technically no Large format lens will work optimally as the sensor requires that the rays illuminate the pixels fully and the rays passing through a digital lens strike the pixels at a different angle then the rays passing through a large format lens. In addition, digital lenses may use the cover glass over the sensor as the last element in the optical formula.

    You may want to read the technical differences in the lens requirements here

    http://www.rodenstock-photo.com/medi...3-26__8236.pdf

Similar Threads

  1. Will the world ever have the Digital Equivalent of the Analog LF Camera??
    By audioexcels in forum Cameras & Camera Accessories
    Replies: 62
    Last Post: 20-Jun-2010, 09:50
  2. Replies: 86
    Last Post: 2-Aug-2009, 21:05
  3. Digital Camera R&D...
    By Bobby Sandstrom in forum Digital Processing
    Replies: 37
    Last Post: 19-Dec-2005, 20:16

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
  •