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Alternative Imaging Methods
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Old June 19th, 2006, 12:20 PM   #1
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Join Date: Sep 2005
Posts: 90
Resolution tests

I have been doing some tests with this resolution chart:

-On my Sony HDV-HC1 without Letus I get:

375 vertical and
525 horizontal

with Letus I get:

325 vertical and
475 horizontal

-these tests where done using a tungsten 100w bulb quite close for lighting. The biggest thing that can make the reading innacurate is not having the focus 100% accurate. My sheet was slanted very slightly and this caused an issue at first. When going back to no-Letus I had to decrease the exposure by 1 click to retain no 100% zebra pattern onscreen -this may be 1 stop or slightly more.

My conclusion: The Letus loses about 1 stop of light and a bit over 10% resolution, sharp focusing is critical to maximise resolution. At 1metre with a 50mm f1.4 at max aperture DOF is only a few centimetres...

The vignetting issue reported in a previous post can be solved by zooming just to '2 clicks' in on the HC1 (this is probably about 65mm equiv).

Regards, Nick.
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Old June 20th, 2006, 01:14 AM   #2
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Join Date: Oct 2005
Posts: 71
could you post some frame grabs ? thanks!
Holger Leonhard is offline   Reply

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