Astromania 0.5X Focal Reducer for Telescope, Fully Multi Coated Field Corrector Imaging Accessory for Telescope Eyepiece Visual and Photography Use - 1.25 inch Filter Thread 28.5x0.75mm on Both Sides
85mm focal length, reduction factor of about 0.5X, depending on spacing. 0.5x focal reducer effectively halves the focal length of a telescope, enabling lower magnification, a wider field of view, and shorter exposure times for astrophotography.
2 lenses for better correction - cemented together and coated, black-anodized aluminum housing.
Mounting threads - 1.25" filter thread (28.5x0.75MM) on both sides: Threads into eyepieces, camera adapters, and other accessories with standard 1.25" threads, and can be stacked with additional 1.25" threaded accessories.
Free light transmission - 22.5mm lens aperture. Can be used with additional spacers (available separately) to achieve further focal reduction.
Intended for use with with longer-focal-ratio telescopes and eyepieces of narrow to moderately-wide apparent fields of view.
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