Martin Van Hemert works at a photo lab. I'm sure he would know. That lab probably does it also. Siegfried Quoting Chuck Hards <chuckhards@yahoo.com>:

I agree that the clerk was probably ignorant, but well-intentioned nonetheless. I was a lab technician for 5 years in a former life, and have processed a mountain of E-6 and other films. While negatives have an exposure latitude of 5 stops, that is, you can expose anywhere within a 5-stop range and still get almost all of the information out of the negative; meaning you can get a good print by compensating with the enlarger for density problems on the negative. Transparency films typically have a latitude less than half that, so in a typical daylight exposure, a 2-stop push (200 to 800) could mean a clear piece of film in an overexposed area; you have a little 35mm plastic window in a cardboard sleeve. The information is irretrevably lost. Now with a black sky background, the typical astro shot has a bit of immunity to force-processing, and you can get away with a 2-stop push much more often. I agree that there is no better lab/studio than Borge Andersen in SLC.

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