Swarovski Spotters Specifications
ATS/STS 65 (HD) Specifications
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| | Eyepiece
20xSW | Eyepiece
30xSW | Eyepiece
45xSW | Eyepiece
20-60xS |
| Magnification | | | 20x | 30x | 45x | 20-60x | | Objective lens diameter (mm) | 65 | 65 | | | | | | Objective lens diameter (in) | 2.56 | 2.56 | | | | | | Exit pupil, diameter (mm) | | | 3.3 | 2.2 | 1.4 | 3.3-1.1 | | Exit pupil, diameter (in) | | | 0.13 | 0.09 | 0.06 | 0.13-0.04 | | Eye relief (mm) | | | 17 | 20 | 18 | 17 | | Eye relief (in) | | | 0.67 | 0.79 | 0.71 | 0.67 | | Field of view, real (m/1000 m) | | | 60 | 42 | 28 | 36-20 | | Field of view, real (ft/1000 yds) | | | 180 | 126 | 84 | 108-60 | | Field of view, real (degree) | | | 3.44 | 2.4 | 1.6 | 2.1-1.1 | | Field of view, apparent (degree) | | | 66 | 66 | 66 | 40-65 | | Shortest focusing distance (m) | 3 | 3 | | | | | | Shortest focusing distance (ft) | 10 | 10 | | | | | | Diopter correction at 8 (dpt) | > 5 | > 5 | | | | | | Twilight factor (DIN 58388) | | | 36 | 44 | 54 | 36-62 | | Objective filter thread | M 67 x 0.75 | M 67 x 0.75 | | | | | | Length, approx. (mm) | 325 | 305 | 70 | 73 | 78 | 86 | | Length, approx. (in) | 12.8 | 12.0 | 2.76 | 2.87 | 3.1 | 3.39 | | Weight approx. (g) | 1100 / HD 1130 | 1080 / HD 1110 | 220 | 250 | 260 | 260 | | Weight approx. (oz) | 38.8 / 39.9 | 38.1 / 39.2 | 7.8 | 8.8 | 9.2 | 9.2 |
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ATS/STS 80 (HD) Specifications
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| | Eyepiece
20xSW | Eyepiece
30xSW | Eyepiece
45xSW | Eyepiece
20-60xS |
| Magnification | | | 20x | 30x | 45x | 20-60x | | Objective lens diameter (mm) | 80 | 80 | | | | | | Objective lens diameter (in) | 3.15 | 3.15 | | | | | | Exit pupil, diameter (mm) | | | 4.0 | 2.7 | 1.8 | 4-1.3 | | Exit pupil, diameter (in) | | | 0.16 | 0.11 | 0.07 | 0.16-0.05 | | Eye relief (mm) | | | 17 | 20 | 18 | 17 | | Eye relief (in) | | | 0.67 | 0.79 | 0.71 | 0.67 | | Field of view, real (m/1000 m) | | | 60 | 42 | 28 | 36-20 | | Field of view, real (ft/1000 yds) | | | 180 | 120 | 84 | 108-60 | | Field of view, real (degree) | | | 3.44 | 2.4 | 1.6 | 2.06-1.14 | | Field of view, apparent (degree) | | | 66 | 66 | 66 | 40-65 | | Shortest focusing distance (m) | 5 | 5 | | | | | | Shortest focusing distance (ft) | 16 | 16 | | | | | | Diopter correction at 8 (dpt) | 5 | 5 | | | | | | Twilight factor (DIN 58388) | | | 40 | 49 | 60 | 40-69 | | Objective filter thread | M 82 x 0.75 | M 82 x 0.75 | | | | | | Length, approx. (mm) | 355 | 335 | 70 | 73 | 78 | 86 | | Length, approx. (in) | 14.0 | 13.2 | 2.80 | 2.9 | 3.1 | 3.4 | | Weight approx. (g) | 1300 / HD 1350 | 1280 / HD 1330 | 220 | 250 | 260 | 260 | | Weight approx. (oz) | 45.9 / HD 47.6 | 45.2 / HD 46.9 | 7.8 | 8.8 | 9.2 | 9.2 |
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CTC 30x75 Specifications
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| Magnification | 30x | | Objective lens diameter (mm) | 75 | | Objective lens diameter (in) | 2.95 | | Exit pupil, diameter (mm) | 2.5 | | Exit pupil, diameter (in) | 0.1 | | Eye relief (mm) | 16 | | Eye relief (in) | 0.63 | | Field of view, real (m/1000 m) | 41 | | Field of view, real (ft/1000 yds) | 123 | | Field of view, real (degree) | 2.35 | | Field of view, apparent (degree) | 66 | | Shortest focusing distance (m) | 10 | | Shortest focusing distance (ft) | 33 | | Diopter correction at 8 (dpt) | > 5 | | Twilight factor (DIN 58388) | 47 | | Objective filter thread | | | Length, approx. (mm) | 310/490 | | Length, approx. (in) | 12.2/19.3 | | Weight approx. (g) | 1200 | | Weight approx. (oz) | 42.3 |
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CT 85 Specifications
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| Eyepiece
30xWW | Eyepiece
20-60x |
| Magnification | | 30x | 20-60 x | | Objective lens diameter (mm) | 85 | | | | Objective lens diameter (in) | 3.35 | | | | Exit pupil, diameter (mm) | | 2.8 | 4.3-1.4 | | Exit pupil, diameter (in) | | 0.11 | 0.17-0.06 | | Eye relief (mm) | | 16 | 16 | | Eye relief (in) | | 0.63 | 0.63 | | Field of view, real (m/1000 m) | | 40 | 33-17 | | Field of view, real (ft/1000 yds) | | 120 | 99-51 | | Field of view, real (degree) | | 2.3 | 1.9-1.0 | | Field of view, apparent (degree) | | 65 | 37-62 | | Shortest focusing distance (m) | 8 | | | | Shortest focusing distance (ft) | 26 | | | | Diopter correction at 8 (dpt) | > 5 | | | | Twilight factor (DIN 58388) | | 51 | 41-71 | | Objective filter thread | | | | | Length, approx. (mm) | 246/436 | 56 | 79 | | Length, approx. (in) | 9.7/17.2 | 2.20 | 3.11 | | Weight approx. (g) | 1400 | 130 | 210 | | Weight approx. (oz) | 49.4 | 4.6 | 7.4 |
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The first windmills were developed to automate the tasks of grain-grinding and water-pumping and the earliest-known design is the vertical axis system developed in Persia about 500-900 A.D. The first use was apparently water pumping, but the exact method of water transport is not known because no drawings or designs -- only verbal accounts -- are available. The first known documented design is also of a Persian windmill, this one with vertical sails made of bundles of reeds or wood which were attached to the central vertical shaft by horizontal struts.
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