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Re: [MetRec] 1/2inch video fish-eye

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  • Rob McNaught
    ... Thanks Mark, I tried unsuccessfully to get more detailed technical specs on this lens. There is something a little strange that it has a longer focal
    Message 1 of 8 , Feb 2, 2002
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      On Wed, 12 Dec 2001 mark@... wrote:
      > also available is a Pentax Cosmicar varifocal lens 1.6 to 3.4mm for 1/3" CCD.
      > Diagonal 180� 118�24'
      > Horizontal180� 89�36'
      > Vertical 180� 64�48'

      Thanks Mark,
      I tried unsuccessfully to get more detailed technical specs on this lens.
      There is something a little strange that it has a longer focal length
      than the Fujinon lens which is also designed for a larger chip. If the
      Cosmicar lens really does produce a full 180 degree circle on the 1/3"
      chip, it must have some extreme horizon compression in comparison with the
      Fujinon lens. This would make it very unsuitable for fireball recording.
      (It could also limit it's use as a cloud monitor, if you would wish to
      see encroaching horizon cloud.) Much better price though!

      Cheers, Rob

      Robert H. McNaught
      rmn@...

      >Fujinon manufacture a 1.4mm F1.4 fish-eye for a 1/2inch CCD format CS-mount
      >video camera. It produces a 4.5mm diameter image on the 1/2inch CCD (which
      >is 6.4x4.8mm).
    • mark@vornhusen.de
      Hello list members, there are a few other fisheye lenses available. A 190° circular fisheye from Omnitech build for 1/3 CCD. But it has only 2.8 f-stop. Price
      Message 2 of 8 , Feb 3, 2002
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        Hello list members,
        there are a few other fisheye lenses available.

        A 190° circular fisheye from Omnitech build for 1/3"CCD. But it has only 2.8 f-stop. Price
        is 250$.
        http://www.omnitech.com/fisheye.htm


        The Pelco 13VA1-3 f1.6-3.4 mm F=1.4.
        http://www.securitysupplies.net/pel13va1len1.html

        This lens seems to be similar to the Pentax Cosmicar TS2V114E f1.4/1.6-3.4mm
        http://www.pentax.co.jp/apc/productE/pro_a/new5.html

        Infos about these two lenses are somewhat confusing. It may be, they are not
        circular fisheyes at f=1.6 when using a 1/3" chip. An idea would be using this
        lens with a 1/2" chip to get a circular image.

        A very low cost lens is also available. It is a door spy cam. Lens is F2.0/1.78mm
        with 170° horizontal FOW on a 1/3" chip.
        http://www.henrys.demon.co.uk/cctv/vb102.htm
        The lens is available seperately, but I lost the link. It cost about 40$. Again it
        might be possible to adapt this lens to a 1/2" camera to have a circular image of
        at least 170°.

        I have builded a fisheye webcam last month, thats why I searched for fisheye
        lenses. However the current construction works with a globe mirror and a 3.6mm
        lens and a 1/3" 0.5lux color CCD. The camera is not constructed for meteor
        detection. The aim is to record the whole sky at day and night (clouds). It
        captures automatically a still picture every 4 minutes. At night the camera uses
        frame integration. Long lasting persistant trains from very bright fireballs may be
        recorded, but not the fireball itself. Since yesterday the camera is on top of our
        roof and we now make some callibration before the images are on the web.

        BTW here are some interesting fast lenses:

        HG1208AFCS 1/2" 12mm f0.8 Video Type $256.52 $155.26
        HG0808FCS-L 1/2" 8.0mm f0.8 DC Type $230.43 $135.53
        HG0808AFCS 1/2" 8.0mm f0.8 Video Type $263.04 $159.21
        HG2610FCS 1/2" 2.6mm f1.0 DC Type $300.00 $181.58
        HG2610AFCS 1/2" 2.6mm f1.0 Video Type $328.26 $198.69
        HG3808FCS-L 1/2" 3.8mm f0.8 DC Type $243.48 $147.36
        HG3808AFCS 1/2" 3.8mm f0.8 Video Type $276.09 $167.10
        HG0608FCS-L 1/2" 6.0mm f0.8 DC Type $241.30 $146.05
        HG0608AFCS 1/2" 6.0mm f0.8 Video Type $271.74 $164.48
        HG1208FCS-L 1/2' 12mm f0.8 DC Type $223.91 $135.53
        TG2010FCS 1/3" 2.0mm f1.0 DC Type $326.09 $197.36
        TG2010AFCS 1/3" 2.0mm f1.0 Video Type $356.52 $215.79
        LD1208ASP Fixed Focal Length – DC Auto Iris, Aspherical: 12mm F0.8 DC
        Auto Iris–1/2” CS $220.00 $139.92
        LD3808ASP Fixed Focal Length – DC Auto Iris, Aspherical: 3.8mm F0.8 DC
        Auto Iris–1/2” CS $240.00 $152.64
        LD0608ASP Fixed Focal Length – DC Auto Iris, Aspherical: 6mm F0.8 DC Auto
        Iris–1/2” CS $240.00 $152.64
        TG2010FCS 1/3" 2.0mm f1.0 DC Type $326.09 $197.36
        WV-LA1208 Lens, 1/2", High Speed, AI, 12mm, f/0.8 $450.00 $300.00
        WV-LA210C3 Lens, 1/3", AI, f/1.0, 2.1mm, Super WA, Aspherical ALC $340.00
        $228.00
        WV-LA408C3 Lens, 1/3", AI, f/0.75, 4.5mm, WA, Aspherical $250.00 $168.00
        WV-LA608 Lens, 1/2", High Speed, Aspherical, 6mm, f/0.75 $450.00 $300.00
        WV-LA908C3 Lens, 1/3", AI, f/0.75, 9mm, Standard, Aspherical $250.00
        $162.00
        The double price is always: list price / price at detectiondynamics
        http://www.detectiondynamics.com

        I`m thinking to buy the Panasonic WV-LA408C3 0.75(!) 4.5mm. It has a FOW
        of 57.2*43.7°. Would be a great lens for aurora videotaping. If anyone has
        experience with this lens, let me know.


        Best,
        Mark
      • Rob McNaught
        Thanks again. Lots of interesting info there. Like you, we are investigating use of a video fish-eye for cloud monitoring, although I would use it also as a
        Message 3 of 8 , Feb 3, 2002
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          Thanks again. Lots of interesting info there. Like you, we are
          investigating use of a video fish-eye for cloud monitoring, although I would
          use it also as a fireball monitor with MetRec.

          Note that the Fujinon 1.4mm fish-eye has never been manufactured!!! When
          we made enquiries we were told we would have to place an order for 300 items
          and have a 5 month wait for delivery! Guess your other lenses sound
          preferable. Note that adapting a 1/3" lens to a 1/2" format may involve
          removal of baffles that prevent extraneous light reaching the 1/3" chip.
          Usually trivial, but you'll certainly loose your warranty!

          Cheers, Rob

          Robert H. McNaught
          rmn@...
        • Andrew Elliott
          I would have thought that not only would you have a problem with the warranty but using a 1/3 lens on a 1/2 camera could give you a potentially serious
          Message 4 of 8 , Feb 5, 2002
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            I would have thought that not only would you have a problem with the
            warranty but using a 1/3" lens on a 1/2" camera could give you a
            potentially serious problem with vignetting: 1/3" lenses are not
            designed for larger formats.

            Andrew Elliott

            Rob McNaught wrote:
            >
            > preferable. Note that adapting a 1/3" lens to a 1/2" format may involve
            > removal of baffles that prevent extraneous light reaching the 1/3" chip.
            > Usually trivial, but you'll certainly loose your warranty!
          • Rob McNaught
            ... No problem with vignetting, unless it is already a problem on the 1/3 CCD. As the diagonal on the 1/3 is 180 degrees, and this diagonal fits within a 1/2
            Message 5 of 8 , Feb 5, 2002
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              On Wed, 6 Feb 2002, Andrew Elliott wrote:
              > I would have thought that not only would you have a problem with the
              > warranty but using a 1/3" lens on a 1/2" camera could give you a
              > potentially serious problem with vignetting: 1/3" lenses are not
              > designed for larger formats.

              No problem with vignetting, unless it is already a problem on the 1/3"CCD.
              As the diagonal on the 1/3" is 180 degrees, and this diagonal fits within
              a 1/2" CCD, the result is a full 180 deg circle within the 1/2" CCD.
              There is always the possibility of baffles that restrict the full circular
              field, but I've only experienced this once in several fish-eye conversions
              to larger formats (35mm -> 120 roll and 120 roll to 4"x5" sheet).

              Cheers, Rob
            • Rob McNaught
              ... Sorry, this is wrong. The 6.0mm diagonal of the 1/3 CCD fits within the 6.4mm horizontal dimension of a 1/2 CCD, but not the 4.8mm vertical.
              Message 6 of 8 , Feb 6, 2002
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                > As the diagonal on the 1/3" is 180 degrees, and this diagonal fits within
                > a 1/2" CCD, the result is a full 180 deg circle within the 1/2" CCD.

                Sorry, this is wrong. The 6.0mm diagonal of the 1/3" CCD fits within the
                6.4mm horizontal dimension of a 1/2" CCD, but not the 4.8mm vertical.
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