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    Fujinon MK lenses now available in MFT mount
    #1
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    B&H has both the Fujinon MK18-55mm https://www.bhphotovideo.com/c/produ...t2_9_lens.html and the MK50-135mm lenses in MFT mounts listed available for pre-order. Since both lenses were designed for S35 sensors and not FF my question is this: The JVC LS300 camera has S35 sensor with a native MFT mount. Will there be any cropping involved if these lenses are used with the LS300? When these lenses are used with S35 cameras like the Sony FS7, I read there is a 1.6 crop factor. Is this true?
    Last edited by nutmegger; 02-10-2019 at 10:38 PM.


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    #2
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    Not true. They are not full frame lenses. The Fuji MK series were designed for S35 sensors so on an FS7 there is no crop factor. The FS7 sensor requires a 27.1mm image circle whereas M4/3 is normally (GH5) 21.64mm so the Fuji used on a GH5 would have a crop of about 1.25. In the case of the LS300 it has a S35 sensor so by rights an Fuji MK series lens with a M4/3 mount should, I would imagine, work just like it would on an FS7, no crop factor. The M4/3 Flange Focal Distance is 19.25. The E-Mount, which the Fuji MK series were originally designed for has a Flange Back of 18mm. I guess the 1.25mm difference has been compensated for in the design of the M4/3 flange. You would need to check it out I guess. The fact that the MK lenses have a true back focus adjustment like broadcast lenses ensures that you can get perfect back focus on either mount which a great feature of these lenses.

    Chris Young


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    #3
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    There could be a minor problem using MFT mount on S35 chip.

    There is a certain probablity (not certainty) that the MFT mount is designed with a 'baffle' that would cut flare by excluding light beyond the MFT image circle.
    Such a baffle, if it exists, could probably be filed away.

    S


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