When a T-mount camera is attached directly to the reducer, the focal length is halved to 0.5X. With the 20mm extension tube you get a reduction of 0.33x.
Reducer Specifications:
Four elements in two groups.
36mm aperture.
Front: 2" male eye barrel.
Rear: T-male thread (M42x0.75)
Flange to flange distance: 5 mm.
Overall length: 38mm.
Extension Sleeve Specifications:
Front: Internal thread T (M42x0.75)
Rear: T-male thread (M42x0.75)
Flange distance: 20mm
Overall Length: 25mm
Blackened edges for optimal contrast.
Our expert comment:
This reducer can only be used in combination with a DayStar filter. The filter must have a 2" plug connection and the chip must have a diagonal of less than 1.5 cm.
To connect to the popular quark filter, you also need the Daystar 1.25" to 2" adapter (item number 53980)
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