Description
OUR PYRITE – LIQUID FOCUS LENSES
These lenses are combining an approved Schneider-Kreuznach lens and one of Optotunes Focus Tunable Lenses EL-16-40-TC (5D version). They come in two versions for C-Mount and TFL-Mount. To achieve a wide range of working distance the lenses can be combined with extension tubes of 5 mm, 7 mm, 8 mm or 10 mm so the liquid lens can always be used in its optimal operating range.
Working principle with extension tubes
In delivery condition the lens has its optimal working distance starting from infinity. To reach closer distances it is necessary to use an extension tube between lens and camera, so that the liquid lens element can always be used in its comfort zone for focussing. The ranges recommended in the table can additionally be extended in both directions by applying a higher operating current as the imaging power decreases.
| Extension tube | PYRITE LF F4.0/60 mm | PYRITE LF F4.0/80 mm | ||
| None | Infinity – 650 mm | 0x – 0.09x | Infinity – 750 mm | 0x – 0.1x |
| 5 mm | 870 mm – 340 mm | 0.07x – 0.18x | 2150 mm – 620 mm | 0.04x – 0.13x |
| 7 mm | 640 mm – 290 mm | 0.10x – 0.22x | 1430 mm – 400 mm | 0.07x – 0.20x |
| 8 mm | 565 mm – 270 mm | 0.12x – 0.23x | 1210 mm – 375 mm | 0.08x – 0.21x |
| 10 mm | 465 mm – 250 mm | 0.16x – 0.27x | 950 mm – 335 mm | 0.10x – 0.24x |
| 15 mm | 330 mm – 220 mm | 0.23x – 0.33x | 630 mm – 300 mm | 0.16x – 0.29x |
| 20 mm | 260 mm – 180 mm | 0.31x – 0.41x | 480 mm – 280 mm | 0.21x – 0.33x |
| 25 mm | 220 mm – 160 mm | 0.39x – 0.50x | 395 mm – 270 mm | 0.27x – 0.36x |
| 30 mm | 190 mm – 140 mm | 0.47x – 0.58x | 340 mm – 255 mm | 0.33x – 0.41x |
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