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Model: TFA06110Brand: Takahashi
Generally In Stock, Please Confirm Before Ordering
This package contains the FOA-60Q tube assembly only. No accessories are included.
The FOA-60 is a new compact apochromatic fluorite doublet refractor from Takahashi. The telescope features a 60 mm aperture and a 530 mm focal length. It is also available with a 1.7X extender, which increases the focal length to 901 mm. The version with the 1.7X extender is known as the FOA-60Q.
The FOA-60 features 2 lenses with Fluorite and one crown lens. The Fluorite lens is positioned on top and the 2nd crown lens is positioned at a rather long distance which causes perfeclty corrected spherical aberation on each frenquency of light.
Strehl ratio is 96.1% on visual with the standard FOA-60 and when using the 1.7x (Q), the strehl ratio becomes 99.8% on visual use.
Despite the long focal length, the total tube length is rather short because of the long range optical design.
The spacing of the doublet elements is such that the correction of the spherical abberations is similar to that found in the much larger TOA series. This innovative design results in a Strehl ratio in excess of 96% for the base unit and over 99% with the extender.
Compact design for relatively long focal length, making it ideal for transportOutstanding visual and photographic performance, providing a 44 mm diameter image circle for full frame imagingAvailable with a 1.7x extender and a 0.93x flattener
Optical Design: 2 Element Fluorite Ortho ApochromatDiameter: 60mmFocal Length: 530mmFocal Ratio: F/8.8
With 0.93x Flattener:
Focal Length: 495mmFocal Ratio: F/8.2Image Circle Diameter: 44mm (5.1°)
With 1.7x Extender (FOA-60Q)
Focal Length: 900mmFocal Ratio: F/15Image Circle Diameter: 44mm (2.8°)Optical Tube Diameter: 68mmOptical Tube Full Length: 500mm
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