Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,521   Posts: 1,572,240   Online: 827
      
Results 1 to 7 of 7
  1. #1

    Join Date
    May 2008
    Location
    North Devon, UK
    Shooter
    Multi Format
    Posts
    42

    Focusing RZ with RB lens?

    Okay something I'm trying to get my head around. I understand that with the RB lenses attached and to focus at a infinity you need to open the bellows 6/7mm and that the scale on the RZ body is redundant. Is what you see on the screen then not what is projected to the film? and if not how do you achieve critical focus. Most the time I shoot with F16 and above but for those F4.5/5.6 shots how you tackle it?

    Thank you
    Stephen

  2. #2

    Join Date
    Feb 2009
    Shooter
    Large Format
    Posts
    670
    With an SLR, what you see is what you get. If it looks in focus—it is in focus.

  3. #3

    Join Date
    May 2008
    Location
    North Devon, UK
    Shooter
    Multi Format
    Posts
    42
    Yes true Ian, so what you are saying is.. yes you do need to make a 6/7mm adjustment for infinity but when focusing on a particular point, what you see is what you get?

    The scale on the body is still redundant though, so is there a equation that can be used to measure the focus point distance which in turn can be transfered to the focus scale on the RB lens?

    Thanks
    Stephen

  4. #4
    Mainecoonmaniac's Avatar
    Join Date
    Dec 2009
    Shooter
    Multi Format
    Posts
    3,120
    Images
    6
    If I'm understanding your question correctly, just just the DOF preview. When you stop down the lens you get more depth of field on your film than what you see in the view finder. I use the DOF preview all the time.

  5. #5
    Kevin Kehler's Avatar
    Join Date
    May 2008
    Location
    Regina Canada (sounds more fun than it is)
    Shooter
    Medium Format
    Posts
    605
    I have noticed on my RZ that if using an RZ lens, when the bellows are fully collapsed, I am focused on infinity. When using an RB lens, I need to advance the focus a couple of mm's to get the lens to focus on infinity (i.e., then the bellows are fully collapsed, I am focused on nothing). However, what you see is what you get and as such, you should always focus on what you need to be focused. So, you might be right in that an RB lens needs a couple of mm adjustment but do not make this adjustment; look at the glass and when it is in focus there, it will be in focus on the negative.
    Once a photographer is convinced that the camera can lie and that, strictly speaking, the vast majority of photographs are "camera lies," inasmuch as they tell only part of a story or tell it in a distorted form, half the battle is won. Once he has conceded that photography is not a "naturalistic" medium of rendition and that striving for "naturalism" in a photograph is futile, he can turn his attention to using a camera to make more effective pictures.

    Andreas Feininger

  6. #6

    Join Date
    Feb 2009
    Shooter
    Large Format
    Posts
    670
    Regarding post #3:

    See “Using RB67 Lenses on RZ PRO II Body” page 21 here:

    http://www.webster.edu/acadaffairs/a...20PRO%20II.pdf

    The information is correct for using the RB67 lenses on all versions of RZ67 bodies.

    The FFD (flange focal distance of the RB67 body is 111mm, while the RZ67 body has FFD of 104mm. Thus an RB67 lens sits 7mm too close to the film plane to focus at infinity (or any other distance).

    Like all through-the-lens focusing systems, the SLR viewfinder image matches what you record on film. For close-up work the true bellows extension needed to determine the required exposure compensation is the reading on the bellows scale - 7mm.

    For example, at infinity focus the bellows scale reads 7mm, so the true extension is 7mm - 7mm = 0, i.e. no extension and no exposure compensation needed.

    If you close focus and the bellows scale reads, say, 32mm, then the true extension is 32mm - 7mm = 25mm and you determine exposure compensation based on 25mm of extension.

    You could still use the DOF scale with an RB lens on the RZ camera by moving the lens back 7mm towards the body after initially focusing and reading the DOF scale for that focal length. Then you’d have to refocus the lens before shooting. To do this you’d look at the bellows scale after focusing and retract the lens 7mm by the scale reading. It’s inconvenient, but can be done.

    It’s usually more practical to simply set the aperture wanted on the preset ring and close the diaphragm with the DOF lever on the right side of the lens as you view the image on the focusing screen.
    Last edited by Ian C; 04-28-2012 at 10:38 AM. Click to view previous post history.

  7. #7

    Join Date
    May 2008
    Location
    North Devon, UK
    Shooter
    Multi Format
    Posts
    42
    Thats great help thanks

    Stephen



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin