Description The TOA series is a member of Takahashi’s line of triplet refractors. In the TOA design, three lens elements are used, with the front and rear constructed from ED glass. The resulting system achieves a high level of apochromatic performance for both visual observation and imaging. Takahashi engineers have a undertaken a complete redesign of the triplet system, completely eliminating spherical aberration while minimizing axial chromatic aberration in the visible light spectrum. In typical apochromatic designs, the elimination of chromatic aberration is usually at the expense of increasing spherical aberration at various wavelengths. However, with the TOA series, the focal shift across the entire visible spectrum from 436nm up to 656nm is less than +/- 0.01mm. This is less than 1/100 the aberration of a typical apochromatic design. TOA-130NS The TOA-130NS is a 130mm apochromatic f/7.7 refractor with a focal length of 1000mm. It features a retractable lens hood and 2.7inch rack and pinion focuser. A complete line of flatteners, reducers and extenders are available, including the 67-series flattener, which provides a 90mm imaging circle. TOA-130NFB The TOA-130NFB is a 130mm apochromatic f/7.7 refractor with a focal length of 1000 mm. It features a retractable lens hood, a 4 inch rack and pinion focuser with a 7:1 fine focuser, and a 360-degree camera angle adjuster. A complete line of flatteners, reducers and extenders are available, including the 67-series flattener, which provides a 90 mm imaging circle. Optical Tube Assembly only (mount, tripod, tube holder and finder sold separately). Specifications TelescopeTOA-130NS TOA-130NS TOA-130NFB Part Number TOK13010 TOK13310 Aperture 130 mm 130 mm Resolution 0.89" 0.89" Limiting Magnitude 12.3 12.3 Light Gathering Power 345X 345X Focal Length 1000 mm 1000 mm Focal Ratio f/7.7 f/7.7 Optical Type Fluorite ED Triplet Fluorite ED Triplet Tube Diameter 156mm 156mm Tube Length (With Lens hood retracted) 1145mm (1012mm) 1155mm (1022mm) Tube Weight 10.5kg 12.3kg Recommended Finder 7x50 7x50 Metal Back Distance 222.5mm 274.5mm Telescope Specifications TOA-130NS System Chart TOA-130NS Reducer System Chart TOA-130NS 35 Flattener System Chart TOA-130NS Extender TOA System Chart TOA-130NS Reducer System Chart
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