The need for speed: C-mount zooms test by Seb Farges


Seb Farges tested a few C-mount lenses on the Panasonic GH1. The video on top shows the C-mount Canon zoom 25-100mm f/1.8 lens performance. The lens is vignetting between 25 and 50mm and it’s also very heavy. He posted a second daylight video here:
Click here to see current 25-100mm f/1.8 auctions on eBay.

And he also tested the C-mount 17-102mm f/2.0 (See video below). There seems to be less Vignetting on that lens.
Click here to see current 17-102mm f/2.0 auctions on eBay.

There are many other C-mount zoom lenses. If you tested some of them feel free to share your image/video samples! Thanks!

  • Bu

    Some very nice video work here!

  • Would it be possible to use only middle of sensor data = no vignetting.
    Thought GH2 will have this feature. Am I right?

  • ADMIN thanks for the post ! :)
    Could you please write my name Seb Farges (and not Fargas) thanks

  • Philip

    Milos: It should. My GF1 has that feature. Just use ‘digital zoom 2x’ and it will crop out the center

    • the GH1 also has this digital zoom 2X feature, but the GH2’s feature will be different… How ? I don’t really understand, actually GH1 has a digital zoom 2X. GH2 will have “M ez” setting, the same tele conversion feature than in still picture mode.

      • Great, thanks. Does it mean that it zooms in while retaining full resolution?

        • Yes Milos, it seems to mean so. As soon as I have theGH2 in my hand, I will confirm it :)

  • These videos look very soft, maybe because its manual focus…..

    I think the GH2 indeed crops the sensor in digital zoom modus, so gone is the vignetting. But how about noise?

    I will certainly buy the GH2 (byebye E3).

    Here is an review of the 20 1.7

    • the videos look soft because I only use the lens with the aperture full opened @ 1:1.8. Usually sharpness on lens is better around 2.8 for example. But using full aperture gives like an “organic” feeling, and not a too much video style.
      As said in the post you have a daylight test of the zoom here : , which shows this “organic” estheticism .
      I’ve just put online another test with a cheap 30$ CCTV C-mount Fujia 35mm 1:1.7 lens here, also fully opened @ 1.7 :

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