C90 マクストフカセグレン式スポッティングスコープ
C90 マクストフカセグレン式スポッティングスコープ
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2年保証
Item #: 52268
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- Multi Coated Optics
- Maksutov-Cassegrain Optical Design
- Compact and Portable Design
- Erect Image System for Terrestrial and Astronomical Use
- Built-in T-Adapter threads for Ease of Adapting SLR Cameras
- Comes with 32 mm Eyepiece, 45° Erect Image Diagonal and 8x21 Erect Image Finderscope
- Backpack Made of Nylon
- Limited Lifetime Warranty
仕様
仕様
| General | |
|---|---|
| Magnification: | 39x (with included eyepiece) |
| Objective Lens Diameter: | 90mm (3.54") |
| Eyepieces: | 32mm Plössl (1.26") |
| Angular Field of View: | 1.3° with included eyepiece |
| Linear Field of View (@1000 yds) / @1000 m): | 68 ft (20.7 m) with included eyepiece |
| Focal Length: | 1250mm (49") |
| Exit Pupil: | 2.3mm (0.1") with included eyepiece |
| Eye Relief: | 20mm (.78") with included eyepiece |
| Close Focus: | 15 ft (4.6 m) with included eyepiece |
| Twilight Factor: | 59.2 with included eyepiece |
| Relative Brightness: | 5.3 with included eyepiece |
| Limiting Stellar Magnitude: | Ideal: 12.27 Moderate: 11.27 Poor: 10.27 |
| Lens Coatings: | Multi-Coated |
| Prism Glass (Type): | BaK4 |
| Prism Coatings: | N/A |
| Weight: | 74 oz (2,100 g) |
| Environmental Protection: | Water Resistant |
| Nitrogen Filled: | No |
| Tripod Adaptable: | Yes (features two 1/4-20 mounting bolt holes and an 80mm (3.15") long CG-5 Dovetail Rail) |
| Carrying Case: | Black heavy woven nylon backpack |
| Camera Adaptable: | Yes |
| Dimensions: | 400mm x 260mm x260mm (15.7" x 10.2" x 10.2") with include eyepiece |
| Included Items: | Plössl 32mm eyepiece 45° diagonal 8x21 finderscope Objective Lens Cover Eyepiece Lens cap Backpack Case |
| 補足情報 | |
| 太陽観測時の注意事項 |
|
よく一緒に検討されている商品
The Maksutov optical design is recognized for being a portable design that is easy to use and has a variety of applications, making it an excellent choice for both terrestrial and astronomical usage. This C90 Mak has excellent optics with razor sharp images over a wide field.
Maksutov-Cassegrain Optical Design
The MAK is a catadioptric spotting scope, which means the optical design includes both a lens and a mirror. The light coming through a MAK passes through the corrector lens to the primary mirror and back to a spherical secondary mirror before it hits the eyepiece. Images are bright, sharp, and virtually free of chromatic aberration.
The Maksutov-Cassegrain's optical design offers several unique benefits. Instead of a secondary mirror, the MAK features a “secondary spot” of reflective coating applied directly to the inside of the corrector plate. Because of this, the spotting scope does not require occasional collimation. Also, the secondary spot is significantly smaller, giving the MAK its signature high-contrast views.
One important thing to note about Maksutov-Cassegrain spotting scope is that the larger, heavier Maksutov corrector plate takes longer to cool down and adjust to ambient air temperature.
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