Takahashi E-180 - Epsilon 180mm ED Astrograph OTA
| Article number: | TEK18010 |
| Availability: | More on the Way to us |
| Delivery time: | More on the Way to us |
This fast field photo visual astrograph is perfect for the new multi-mega pixel digital 35mm cameras and CCD cameras. The great speed will enable the imager to record faint nebulosity invisible in slower instruments. The appreciably shorter exposure times reduce tracking error and will produce very small stars.
The E-180 will produce 10 micron star across the entire flat field.
Optical Specifications: Takahashi Epsilon 180ED Hyperbolic Astrograph Aperture (mm) 180 mm Aperture (in.) 7.1 inches Focal Length 500 mm Focal Ratio f/2.8 Physical Parameters Weight, Optical Tube 23.5 Pounds Optical Tube Length 22.4 Inches Takahashi Epsilon180ED f/2.8 Hyperbolic Flat-Field Astrograph Telescope Features... Dual action collimation screws, mirror tension adjustment and collimation marks make critical alignments fast and easy. The low profile Crayford rack-and-pinion focuser has a rotary system for framing and provides 56mm of backfocus from the end of the corrector. Extra-low dispersion two element corrector combined with hyperbolic primary mirror produces flat field images with no coma or chromaticism. 180mm effective aperture provides a light grasp of 661x at a limiting visual magnitude of 13.0 with an outstanding resolution factor of 0.64 arc seconds. Focal length of 500mm and focal ratio of F/2.8 yield 44mm image circle - 60% not vignetted. M54mm female thread photographic connector on the corrector (for wide T-mount) included. Tube Dimensions: 570mm/22.4" (length) - 232mm/9.13" (diameter) - 22 lbs/10.7 kg (weight). Five Year Manufacturer Warranty.
The Epsilon series of astrographs are specifically designed for exceptional astrophotography. Takahashi’s proprietary optical design features a hyperbolic, concave primary mirror with a 2 element ED corrector lens to eliminate spherical aberration and coma. Compared to the conventional Schmidt camera design, the chromatic aberration is reduced by half, even out to large viewing angles.
The ε-180 was introduced by Takahashi as the first of the new Epsilon flat–field hyperbolic astrographs since the 1980’s. The ε-180 was designed to be a very fast f/2.8 imaging system.
This fast field photo visual astrograph is perfect for digital SLR's and CCD cameras. The f/2.8 speed will enable the imager to record faint nebulosity not visible in slower instruments. In addition, the appreciably shorter exposure times reduce tracking error and will produce pin point stars. The ε-180 will produce 10 micron stars across the entire 44 mm diagmer flat 5 degree field.
The focuser has been improved to allow more precise focusing. Each has a metal insert with a special non-cold flow material to allow for correct focus.
SPECIFICATIONS for the E-180 (Tube assembly only)
| Effective aperture | 180mmØ |
| Primary mirror | 190mmØ |
| Secondary mirror | 80mmØ |
| Effective focal length | 500mm |
| Effective focal ratio | f/2.8 |
| Image circle | 44mmØ |
| Image across field | 10 microns |
| Metal back distance | 56mm |
| Diameter of main tube | 232mmØ [9.13"] |
| Length of main tube | 570mmØ [22.44"] |
| Weight of main tube | 10kgs. [22lbs.] |
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