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Tells you the correct exposure time when enlarging B&W negatives. To use, place calculator on top of sheet of 4 x 5" enlarging paper. Expose for 60 seconds with negative in enlarger. Develop paper and select exposure time in seconds that corresponds to best appearing sector. Simple but accurate and saves time spent in the darkroom.
| SKU | 221147 |
|---|---|
| Brand | Generic |
| Shipping Weight (Lbs.) | 0.1000 |
| Price | $7.99 |
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