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vi08
medical school grad
Joined: 16 Jul 2009
Posts: 73
Location: Des Moines, IA
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 Posted: Wed Sep 21, 2011 2:31 pm Post subject: glass assy |
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can someone tell me why the 2100 scanner glass has 2 gray strips compared to the older model K-75 (2010?) which the glass does not have the 2 gray strips
thanks |
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mark in vegas
doctor
Joined: 20 Oct 2010
Posts: 1852
Location: Las Vegas, NV
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| Posted: Wed Sep 21, 2011 4:15 pm Post subject: |
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The strips create an apperature, better controlling the image.
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Mark
RVN 68-69
It's so nice to be insane
No one asks you to explain |
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vi08
medical school grad
Joined: 16 Jul 2009
Posts: 73
Location: Des Moines, IA
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| Posted: Wed Sep 21, 2011 5:32 pm Post subject: |
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does the gray color do anything
cause i noticed the front of the strip is gray and the back is black
i pulled up list price on this -- just shy of $700 |
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mark in vegas
doctor
Joined: 20 Oct 2010
Posts: 1852
Location: Las Vegas, NV
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| Posted: Thu Sep 22, 2011 11:24 am Post subject: |
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Only a guess but logic would suggest that the colors have different reflectivety. "Back in the day" before things were controlled by a computer, many machines had swapable apertures to control exposure. Those strips can also control stray light. I didn't ask, is the glass scratched? Sometimes the scratch won't show after shading is done.
_________________
Regards,
Mark
RVN 68-69
It's so nice to be insane
No one asks you to explain |
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Chazbo
doctor
Joined: 05 Jul 2005
Posts: 377
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| Posted: Thu Sep 22, 2011 2:23 pm Post subject: |
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a gray card is used in photograpy to get correct light exposure so I would say the gray strips on scanner glass are to aid in color balance and constant image exposure. the black is to eliminate refraction of light
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Ride To Live |
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mark in vegas
doctor
Joined: 20 Oct 2010
Posts: 1852
Location: Las Vegas, NV
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| Posted: Thu Sep 22, 2011 3:07 pm Post subject: |
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Excellant thinking Chaz. That might explain part of the high cost. Gray reference cards are expensive to print correctly and the density has to be spot on.
_________________
Regards,
Mark
RVN 68-69
It's so nice to be insane
No one asks you to explain |
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cjwilt
doctor
Joined: 24 Jan 2007
Posts: 1041
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| Posted: Fri Sep 23, 2011 8:36 am Post subject: |
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FYI
I have a local glass shop make the same piece of glass for me without the grey strips and they work fine. I've been using them for years with no problem. Don't pay $700 when you can get it for $30. |
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mark in vegas
doctor
Joined: 20 Oct 2010
Posts: 1852
Location: Las Vegas, NV
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| Posted: Fri Sep 23, 2011 11:22 am Post subject: |
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Nice! Just plain old window glass?
_________________
Regards,
Mark
RVN 68-69
It's so nice to be insane
No one asks you to explain |
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mark in vegas
doctor
Joined: 20 Oct 2010
Posts: 1852
Location: Las Vegas, NV
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| Posted: Fri Sep 23, 2011 11:22 am Post subject: |
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Nice! Just plain old window glass?
_________________
Regards,
Mark
RVN 68-69
It's so nice to be insane
No one asks you to explain |
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cjwilt
doctor
Joined: 24 Jan 2007
Posts: 1041
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| Posted: Fri Sep 23, 2011 11:46 am Post subject: |
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| Yeah, just get the same thickness and have them bevel the edges and you are good to go. |
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mark in vegas
doctor
Joined: 20 Oct 2010
Posts: 1852
Location: Las Vegas, NV
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| Posted: Fri Sep 23, 2011 1:08 pm Post subject: |
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Way to think out of the box. Next one that comes up for a change I'll give it a go.
_________________
Regards,
Mark
RVN 68-69
It's so nice to be insane
No one asks you to explain |
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