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  1. #1

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    OM-1 focusing screens, I am so confused

    I just got an OM-1 and of course started reading about all the focusing screen options and am trying to figure out which one I already have. I have been referring to this site:

    http://www.mir.com.my/rb/photography...ens/index1.htm

    The viewfinder image I see is the brightest and largest I have ever seen in a camera which is good, but I am wondering about the fact that some of the focusing screens are noted as "The meter needle does not indicate proper exposures" If I had to take a guess, the image I see in the viewfinder looks most like what I see listed as a 1-5 to 1-7 type.

    I see a small circle in the middle where I achieve focus so that is the microprism type I believe. To me the area outside of the microprism circle looks basically clear, not at all what I would call matte. I would assume on the matte focusing screens the area outside the circle is very obviously matte.

    So my questions are, what are the impacts if I have a 1-5 to 1-7 type, can I not trust the meter at all period?

    And is there a good way to tell which screen i have already? From what I have read a lot of people like the 1-4 or 1-4n screens.

    thanks!
    Last edited by Jim Bennett; 03-11-2014 at 07:11 PM. Click to view previous post history.

  2. #2

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    the number of the screen is embossed on the handling tab.

    think you can read it if you remove the lens.

    The battery you are using not being mercury may have a larger offset than the screen.

  3. #3

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    Thanks I had it out last night and my old eyes must have missed that!

    Sent from my XT1058 using Tapatalk

  4. #4
    Poisson Du Jour's Avatar
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    If you have a slow lens of around f5.6, this will darken the viewfinder and allow you to take a closer look at the area surrounding the central microprism. If there is no discernible matte surface surrounding the microprism then it can be safely assumed you have one of the clear-field focusing screens (1-5 to 1-7) and it is correct that the meter needle will vary in its position relating to correct exposure (when it is quite likely over- or under-exposed) and the lens in use, with each screen optimised for a specific lens type. You may also have a Beattie Intensescreen installed; these novelty screens provide an exceptionally bright image at the expense of the need to tweak metering. At the end of the day, if you can achieve correct and accurate focus on the central microprism and the results you get back indicate good exposure, that's the end of the matter. On the issue of exposure, I would advise loading the camera with transparency film and shooting both at what the meter reads and with + and — compensation applied, taking notes. There is very little latitude for exposure error with transparency film and it is a fast way of checking metering accuracy with fairly benign scenes. If exposures are erratic, it will probably be better to whip out the focusing screen and install a standard version.

    __________________________________________________ _______
    (Disclosure: I am an editorial contributor to the Canon EOS 1-series
    section of mir.com.my)


  5. #5

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    Thank you so much for those details! That helps a ton, I appreciate the reply!

    Sent from my XT1058 using Tapatalk

  6. #6

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    Here is some information on the focusing screens:

    http://omesif.moosemystic.net/om-sif...ingscreens.htm
    Dave

    "She's always out making pictures, She's always out making scenes.
    She's always out the window, When it comes to making Dreams.

    It's all mixed up, It's all mixed up, It's all mixed up."

    From It's All Mixed Up by The Cars

  7. #7
    nsurit's Avatar
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    A 1-13 screen might be a good choice if your eye sight is not so good anymore. That is what I use as the split image can be real easy to focus. Bill Barber

  8. #8

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    Olympus had two different series of screens. The 1- series can be mounted in any single digit OM, the 2- series are for the 2SP, 3 and 4. The clear screens (1-5, 1-6, 1-7) will give incorrect meter readings on the OM-1 and OM-2 in manual. I have always assumed this is because the clear screen allows more light to pass thru. The OM-2 will work fine in Auto since it uses the OTF (Off The Film) light for metering.

    The clear screens seem to have been something of a specialty item for someone who needed a very bright viewfinder but no depth of field preview. I use a 1-7 for astonomical photography but not for normal usage. The 1-13 is probably the most common and "standard" screen. The split prism makes it easy to focus and it is readily available.

  9. #9

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    Quote Originally Posted by thuggins View Post
    Olympus had two different series of screens. The 1- series can be mounted in any single digit OM, the 2- series are for the 2SP, 3 and 4.
    No. The OM-2S Program, the OM-3 and the OM-4 were all provided with a 1-13 screen as the standard screen.

    There are only two screens in the "2" series. The 2-4 and the 2-13 screens were very late offerings at the same time as the OM-3Ti.
    Dave

    "She's always out making pictures, She's always out making scenes.
    She's always out the window, When it comes to making Dreams.

    It's all mixed up, It's all mixed up, It's all mixed up."

    From It's All Mixed Up by The Cars

  10. #10

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    Quote Originally Posted by mopar_guy View Post
    No. The OM-2S Program, the OM-3 and the OM-4 were all provided with a 1-13 screen as the standard screen.

    There are only two screens in the "2" series. The 2-4 and the 2-13 screens were very late offerings at the same time as the OM-3Ti.
    This explains why both my OM-3 and OM-4T have only 1-13 screens in them. The cynic in me thought a previous owner pulled out the valuable "2" series screens and sold them off before I received the cameras.

    I am less cynical today.
    - Bill Lynch

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