From: Guide Dept @ Stouffer Graphics (@)
Date: 09/30/02-01:04:19 PM Z
Hello Philippe,
Your most cost effective remedy would be to contact X-Rite to see about getting a different orifice for your 810 densitometer like Dave suggests. Go to www.xrite.com to get contact information. They do have several regional sites, one that may be able to help you in Belgium.
If getting a smaller orifice for your 810 densitometer isn't possible, I will be happy to work with you off list.
Sincerely,
Kevin Morris
Stouffer Industries
----- Original Message -----
From: FotoDave@aol.com
To: alt-photo-process-l@skyway.usask.ca
Sent: Monday, September 30, 2002 10:17 AM
Subject: Re: Step wedge
Philippe,
I don't think X-Rite uses all the 1/2 for measurement. As far as I remember, there are two sizes of opening they use, one is 4mm, and you use that for halftone (or digital) film since it consists of opaque dots and clear area, so one would like to have a wider area to measure the "average" amount of light transmitted.
For continous-tone negative, one can use a smaller opening because light passes through the small area and is blocked by the opacity. I forgot the exact dimension for the opening. I think it is 1 mm (but using a 4mm opening to measure contone film is fine too, especially if you are measuring a step tablet. The slight difficult is when you use it to measure a small area in your image which is smaller than 4mm. But you can use it as an approximation and make some adjustment, or use a larger area of the image).
So there are several possibilities, you could probably order something to adjust the opening from X-Rite. If that is not convenient for you because you are in Belgium, using the 4mm is not so bad. It can still be used to measure the 1/4 inch step tablet.
Dave S
I bought a X-Rite 810 densitometer. The diameter of the measuring spot in transmission is about 1/2 inch. On the other hand, my step wedges from http://www.stouffer.net have a step width of about 1/4 inch.
I would like to buy new step wedges with wider steps.
Anyone could recommend me something ?
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