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Re: Attaching Canon EOS focus chip to a Samyang?

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  • Hans
    ... There is no meaning in getting it recognized as long as the software does not have it in their database. And I doubt very much that the Samyang will ever
    Message 1 of 5 , Dec 29, 2009
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      --- In PanoToolsNG@yahoogroups.com, "dburton97128" <dburton97128@...> wrote:
      >
      > I agree with all you said about the value being marginal for focusing. I was just hoping to get Canon DPP SW to recognize the lens and allow for lens aberration correction. (Maybe I'm jumping to conclusions that this is all I need to do to get DPP fully working.) I'll also take a look at the SW you mentioned below.

      There is no meaning in getting it recognized as long as the software does not have it in their database. And I doubt very much that the Samyang will ever be in any Canon DPP database.

      Hans

      >
      > I wrote to someone in China selling these and they said it could be done, but I would have to make sure I get it located correctly (well duh). They have a version that can be programmed with the correct lens speed and focal length so the correct info goes into the EXIF.
      >
      > Thanks,
      > David B
      >
      > --- In PanoToolsNG@yahoogroups.com, "Roger D. Williams" <roger@> wrote:
      > >
      > > I am impressed that someone thought of doing this, even more impressed that
      > > it seems to work reasonably well, but remain unsure that you need it for
      > > the Samyang. (I'm referring to third-party focus chips.)
      > >
      > > Depth of focus is so large on the Samyang that it is very difficult for
      > > an auto focus system to locate the optimum focus point accurately. Much
      > > better to set it by eye, although this assumes that the distance
      > > setting numbers on the lens barrel are reasonably accurate, which might
      > > be worth checking.
      > >
      > > Of course I may be speaking out of turn here because I own neither a
      > > Canon camera nor a Samgyang fisheye lens. But I fail to see how this
      > > chip would help much under the circumstances, i.e., with a fisheye lens
      > > that is almost pan focus in normal use.
      > >
      > > If the issue is CA, then I use DXO for a camera/lens combination that it
      > > supports, and this takes care of CA automatically, which may be what your
      > > Canon firmware does. But for unsupported combinations I find Sikypix
      > > quite satisfactory for removing CA once I have found a good combination
      > > of the two settings provided (for red/green and yellow/blue). I usually
      > > shoot at the "sweet spot" for lens resolution, so I don't have to bother
      > > about a wide range of (possibly) aperture-dependent settings.
      > >
      > > So while a focus chip may do all it claims to do, I don't see how it
      > > would help. Forgive me if I'm missing something important here.
      > >
      > > Roger W.
      > >
      > >
      > > On Mon, 28 Dec 2009 17:42:20 +0900, dburton97128 <dburton97128@>
      > > wrote:
      > >
      > > >
      > > > Has anyone bought one of those aftermarket focus chips to add to their
      > > > Samyang 8mm lens? I see some that can be programmed to give the correct
      > > > length and speed to the camera.
      > > >
      > > > http://tinyurl.com/y92sq44
      > > >
      > > > http://tinyurl.com/y8njv5j
      > > >
      > > > Thanks.
      > > >
      > > >
      > > >
      > > > ------------------------------------
      > > >
      > >
      > >
      > > --
      > > Business: www.adex-japan.com
      > > Pleasure: www.usefilm.com/member/roger
      > >
      >
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