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Re: Which step tablet density?

Phil Davis

19:33 9 Aug 04

Sandy --

This is an argument I'd just as soon not get involved in because I'm not persuaded that staining developers are so superior to other types that the uncertainty involved in calibrating their behavior is worth struggling with.

I have two thoughts: First, I suspect you can get good results with any reasonable test methods if you use them consistently and refrain from comparing specific numbers with those from other test methods. In other words, it probably doesn''t matter a whole lot whether you arrive at a nominal SBR of 8.3 or 7.5 as long as you adapt your working habits to match the number of your choice, and avoid arguments with users of other methods.

Second: If you really want to optimize the conditions you probably should buy or make a stained step tablet and use it for all of your calibrations. Two possible problems with this, though, stains vary in color to some extent with different films. different dilutions, and different times, so you might need more than one step tablet. Also there's the problem of calibrating the step tablets themselves.

Incidentally, the only reason why the x and y axes have to be marked off in equal increments is because that's what the Plotter expects. This is not necessarily a problem if you hand-calibrate.