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The 0.6x reducer transforms the Askar 103APO into a fast f/4 system, shortening the focal length to 420mm while also flattening the field for improved image quality. This reducer is specifically designed for use with the 103APO’s detachable rear tube - which must be removed during installation to achieve the shorter focal length. (Refer to installation guide image below.)
With a quadruplet lens design, this reducer supports a full-frame image circle up to 44mm, delivering wide, flat imaging performance. Weighing 0.98 kg, it offers robust, CNC-machined construction with metal caps on both ends for dust protection when not in use.
Adapter & Thread Details:
Back focus: 55mm (measured from the base of the M48 male thread)
Front thread: M84×1 (to connect with the telescope)
Rear thread options:
M68×1
M68×1 to M54×0.75 adapter
M54×0.75 to M48×0.75 adapter (includes built-in M48×0.75 2-inch filter thread for direct filter use)
Technical Specification
Parameter
Value
Effective Focal Length (with Reducer)
420.24 mm
Effective Focal Ratio (with Reducer)
f/4.08
Lens Structure
Quadruplet
Back Focus
55 mm
Weight
0.98 kg
Rear Thread
M68×1
Included Adapters
M68×1 → M54×0.75, M54×0.75 → M48×0.75
Built-in Filter Thread
M48×0.75
Manufactured in
China
