Mark: : Well I am interested in doing a bit more experimentation, and reality : its probably a step I should have taken years ago. I have always been : an it looks right kind of guy instead of a numbers kind of guy and just : really felt a need to put numbers to my black an white work. Yes its : slowed the learning curve down at times. Yet after a while a look at a : negative seemed to be just fine. : : I am now curious about how my calibrated eyeball compares with the : numbers. I wonder what a lower cost, decent denisometer would run and : what brands, makes, models ect I should look for an which ones I should : avoid. As always help is greatly appreciated. Just looked around and found this: http://perso.wanadoo.es/terenciano/densitometro/densitometro.html if you hve any electronice skills (or a friend who does ;) this would work as well as any commercial densitometer Personally I would use a voltage regulated power supply rather than the simple one they use (none) and I'd also use a white light LED .. infinitely better than an incandescent globe s the luminence does not vary anywhere near as much as a heated filament globe :) that way you could also use the LED in a swinging arm which trips the light using a microswitch - much as a 'real' densitometer does