How long should i expose Ulano QX-1 emulsion?

Question

I recently bought Ulano QX-1 photo emulsion and I was wondering what the exposure time in the SUN would be.

Answer 1

Expose so you get a solid step 7 on a Stouffer 21 step transmission gray scale.

http://www.ulano.com/FAQ/FAQexposure.htm...

The big problem with the sun is that it is a moving target. 8am, 10am, noon, 2pm, 4pm, 6pm - all sunny, but not the same invisible UV energy.

Toronto, New York, Miami, Aruba, Caracas, Buenos Aires - all different.

Without a test positive to simulate different exposures, you will have to make a segmented (stepped exposure) of different lengths.

http://www.ulano.com/video/UlanoExposure...