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Sony VX2100 / PD170 / PDX10 Companion
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Old January 4th, 2004, 08:39 PM   #1
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1/30th And Slower, And Resolution

Do you really lose 50%? Or what are the facts?
Anyone know why this is?
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Old January 5th, 2004, 05:24 AM   #2
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It seems to be like that, indeed. Don't know if it is that much
though. Found some more information on this thread
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Old January 5th, 2004, 08:06 AM   #3
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Yes, you do lose half of your vertical resolution (horizontal resolution stays the same of course) because at shutter speeds slower than 1/60 (NTSC) the picture is composed of one field only.

It's easy enough to test out. Just set up your camera on a tripod and take two stills to memorystick - one at 1/60th, the other at 1/30th. Pull these frames into Photoshop and notice the stair-stepping on diagonal lines at 1/30th - the reason being the lack of the other field.

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Old January 5th, 2004, 10:58 AM   #4
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Tom,
My understanding was it's still two fields under 1/60th.
Are you saying it's not interlaced below 1/60th?
I thought the interlacing is what *causes* the stair stepping.
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Old January 5th, 2004, 11:04 AM   #5
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Yes, it's still two fields. Problem is it's the same field.
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