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    Re: Jupiter Lunar DSLR Camera Trial
    From: Marcel Tschudin
    Date: 2010 Sep 23, 12:44 +0300

    The results Greg obtained
    
    Day Venus DSLR Trial: 0.4' and 0.2'
    DSLR Venus Lunar: 1.4'
    and here now
    Jupiter Lunar DSLR Camera Trial: 1.5' and 0.5'
    
    agree well with the expected +/- 0.84' accuracy resulting from more
    than 100 calibration observations. This accuracy depends not only on
    the camera-lens system, but also on the techniques used for obtaining
    the angular distance from the photo. For the latter Greg preferred to
    introduce some simplifications in order to make it more practical for
    him. Without these simplifications the observations are expected to
    scatter somewhat less.
    
    Greg's last observation shows also something else. All the calibration
    photos were taken with an aperture of F22. This observation was
    however done with an aperture of F4. The results of this observation
    indicate that the calibration is also valid for this larger aperture.
    I guess this is a sign for the quality of the lens which Greg is
    using.
    
    Marcel
    
    
    On Thu, Sep 23, 2010 at 7:17 AM, Greg Rudzinski  wrote:
    > This evening the eastern sky was clear for a near/far Jupiter Luner DSLR
    > camera trial and a near/far Jupiter Lunar using a 4x40 scoped Plath as a
    > check.
    >
    > 10MP DSLR 50mm lens 1/200 sec. ISO 1600 F4 infinite focus
    > 9/23/2010 UT 3:20:40 Lat.34� 10.4'N Lon.119� 13.8'W
    > Near Limb 5�31.4' clearing 45.3' longitude (-1.5')
    > Far Limb 6� 3.4' clearing 15.7' longitude ( 0.5')
    > cleared by Reed online program
    >
    > Plath 4x40 scope
    > 9/23/2010 UT 2:53:16 Lat.34� 10.4'N Lon.119� 13.8'W
    > Near Limb 5� 32.4' clearing 2.2' longitude (-0.1')
    > 9/23/2010 UT 3:35:6
    > Far Limb 6� 3.0' clearing 7.6' longitude (-0.3')
    > cleared by Reed online program
    >
    > The sextant is still the champion instrument when it comes to taking Lunars
    > but the DSLR camera with a 50mm lens put in a respectable showing.
    >
    > Greg Rudzinski
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