Scanner Calibration

[SteveH]

I don't mean to hijack this thread but the other side of scanner calibration is focus calibration.
I would be interested to know how many people have used a USAF1951 target or similar to find the optimum focus of their scanners and how useful you found this to be.
Considering that a USAF1951 target is about US$100 on glass plate, is it worth the investment? I know Sandy King has posted results of test of his scanner.
What other options exist?
Thanks
Steve

[Ken Allen]

When we use the digital copy stand we use reflective and transmissive resolution charts and they are important to the quality control process. But the Epson 700/750 scanner is a set 2-step set focus (no auto focus like the 10,000), so I don't believe that can be calibrated? Or am I wrong? I only tested this scanner, and do not have one.

[SteveH]

Hi Ken
the V700/750 is calibrated by adjusting the height of the film holder. The Epson holders are a 3 step adjustment, the better scanning holders have a continously variable height adjustment.

Steve