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Thread: A Dumb Question--M9 Related

  1. #1
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    A Dumb Question--M9 Related

    Do lenses need to be coded for to be used on a M9? UV/IR filters? I'm finally about to buy a M9 and am wondering since my lenses aren't coded.

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    Re: A Dumb Question--M9 Related

    Do not use UV/IR filters - not needed and will probably make things worse with wides.
    There is no need to code other than for convenience.
    Non coded lens IDs can be selected from a menu.

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    Re: A Dumb Question--M9 Related

    Quote Originally Posted by FrozenInTime View Post
    Do not use UV/IR filters - not needed and will probably make things worse with wides.
    There is no need to code other than for convenience.
    Non coded lens IDs can be selected from a menu.
    Thank you very much! All I needed to hear.

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    Re: A Dumb Question--M9 Related

    Hi,

    All the info mentioned is correct. One advantage though of using a lens thats coded is that each time you change a lens, you don't have to remember to go into the menu and change the lens selection...which often times, people forget to do. This of course will have no effect when using 50mm and longer focal length lenses, except for the exif data indicating focal length of lens being used won't be recorded. Yet for 35mm and wider lenses, it is important to have the camera recognize which lens is in use, so in-camera corrections can be applied to the recorded image, in order to address possible "red edge" issues and also vignetting.

    Dave (D&A)
    Likes 1 Member(s) liked this post

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    Re: A Dumb Question--M9 Related

    Dave has explained it well. Regarding filters there is nothing to stop you using a good quality UV/protection filter on your lenses, but an IR filter isn't needed. The vignetting that the camera compensates for is for light fall off due to the angle the light hits the sensor, plus any intrinsic fall off with extra wide lenses. So if you use a UV filter on your lenses with a film camera they will still work okay on your M9. And congratulations on your purchase.

    Steve

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    Re: A Dumb Question--M9 Related

    I might be wrong but I believe to remember that coding the lens also would lead to some lens specific correction of vignetting and eventually some color vignetting correction for wide angel lenses?

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    Re: A Dumb Question--M9 Related

    Quote Originally Posted by Paratom View Post
    I might be wrong but I believe to remember that coding the lens also would lead to some lens specific correction of vignetting and eventually some color vignetting correction for wide angel lenses?
    This is correct.
    But with the M9 the lens code can be either read automatically or manually set via a menu.
    As Dave expanded on, it's all too easy to forget, in the heat of action, to go into the menu and update the manual lens selection when swapping lenses around.
    In an ideal world it would be nice to code all ones lenses and to leave the selection menu at auto ( only 3 of my 10 lenses are coded ).

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    Re: A Dumb Question--M9 Related

    I dont think it would be necessary to code anything 50mm and longer, just get the 35 and wider coded and leave correction on auto. works well for me.

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    Re: A Dumb Question--M9 Related

    http://forum.getdpi.com/forum/leica-...tml#post416057

    I did a couple of quick test with the IR contamination of the M8 vs M9 above. The M8+IR Cut filter does better than the M9 without the IR cut filter.

    Long story short- I leave the IR cut filter on the longer lenses, does not hurt. I take them off of the wide-angle lenses,

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    Re: A Dumb Question--M9 Related

    If shooting raw and converting is it necessary to select a code or code wides in camera or can this correction be done in LR4? I think LR4 has Leica and Zeiss lens correction profiles in a pull down menue. I use LR4 for converting my D800 images and the aberrations are fully corrected this way. My Hasselblad images / raw are corrected the same way.

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