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| 22-AUG-2011 | |
The Lios Ultra extinction meter was the ne plus ultra in 1928. Exposures from 24 minutes to 1/500 sec, f/1.4 to f/64, emulsion speed 2° to 27.5° Scheiner or 8° to 4000° Hurter & Driffield.
All images (c) John Ewing. All rights reserved
| comment | |
| Steve Thuman | 31-Aug-2011 01:46 | |