>Daystar Filters Imaging Focal Reducer 0.5x / 0.33x, 2 -T with 20 mm T extension tube (SKU: FR2DT) extras opinie

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Daystar Filters Imaging Focal Reducer 0.5x / 0.33x, 2"-T with 20 mm T extension tube (SKU: FR2DT) is an optical focal reducer designed for solar imaging with Daystar filter systems. It increases the field of view by shortening the effective focal length of the optical system. The reducer features a 2" to T-thread (M42×0.75) configuration, allowing direct insertion into a telescope focuser with a T-thread camera attached on the output side.

When a T-mount camera is connected directly to the reducer, the effective focal length is reduced to approximately 0.5×. Adding the included 20 mm T-thread extension tube increases the reduction to approximately 0.33×. For applications where interference patterns may appear, the reducer can also be combined with the Daystar Interference Eliminator adapter (sold separately), resulting in an effective reduction of approximately 0.38×.

In practical use the obtainable field of view may be limited by the clear aperture of the solar filter etalon. Quantum filters typically provide a larger usable imaging field compared to Quark or Ion filters.

Key features

• focal reducer designed for solar imaging systems
• significantly increases field of view
• focal reduction 0.5× or 0.33× depending on configuration
• four-element optical design in two groups
• compatible with Daystar Interference Eliminator adapter
• T-thread (M42×0.75) camera compatibility
• suitable for full-disk solar imaging in selected configurations

Box contents

• Daystar Imaging Focal Reducer
• 20 mm T-thread extension tube

Technical specifications – reducer

• optical design: 4 elements in 2 groups
• clear aperture: 36 mm
• focal reduction: 0.5× (camera directly attached)
• front connection: 2" male eyepiece barrel
• rear connection: male T-thread (M42 × 0.75)
• flange-to-flange distance: 5 mm
• overall length: 38 mm

Technical specifications – extension tube

• front thread: female T-thread (M42 × 0.75)
• rear thread: male T-thread (M42 × 0.75)
• optical length (flange distance): 20 mm
• overall length: 25 mm
• internal knife-edge baffles for improved contrast