From: Bill Collins (photo@intrex.net)
Date: 03/08/01-12:31:42 PM Z
That's a great idea! I have a stereo microscope, so I could put the meter on one eyepiece and use the other to see what the meter is looking at.
Bill
---------- Original Message ----------------------------------
From: "Alexander L. Wallace" <wallacea@cofc.edu>
Reply-to: alt-photo-process-l@sask.usask.ca
Date: Thu, 08 Mar 2001 12:35:08 -0500
>Re: Densitometers
>
>For those of you who have a microscope lying around this may be of some
>interest. The Minolta probe booster box contains an adapter to change to
>tip from reading the ground glass of a view camera to reading the light
>coming through the microscope eyepiece tube. By comparing the readings
>with a calibrated step tablet, such as the Kodak t-27 I was able to get
>very good readings from suitably small areas of negatives.
>
>The incandescent bulb of the microscope gave enough light, though it worked
>better by increasing the output by removing a blue filter behind the
>frosted glass in the microscope base.
>
>By directing a small high intensity light at the platform where you put the
>negatives (or microscope slides) at a 45 degree angle it was possible to
>get reflective readings from a print also. For comparison a calibrated
>gray card from Kodak for copy work gave the compared reflective density
>values.
>
>Sorry, no experience with pyro.
>
>Regards,
>
>ALW
>
>
>ps Minolta booser not needed,if you put a luna pro in a little box to
>securely hold it against the eyepiece tube of the microscope it also will
>work, but the range is limited by the luna pro sensor .
>
>
>
>
>
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