Response to Alternative to Xtol

There is one other way to increase film speed. An overall light exposure DURING the image exposure. Concurrent photon amplification. There was an article in the June 1976 issue of Popular Photograpy about a company that modified 35mm SLR's. They put tiny light bulbs in the mirror box. The upshot was that it took much less exposure than pre or post flashing to get a stop or more of shadow speed increase. They claimed no fogging or contrast reduction like with pre/post flashing. It seems to me white LED's would be perfect for this today.

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