Farpoint Astronomical Research - Focal Reducer - F 0.5 & F 0.33 focal reducer for 1.25 inch telescope nosepieces

F0.5 & F0.33 focal reducer
Fits standard 1.25" focusers
Two lens system for better correction
Improved green multicoating
Metal and glass construction

Exposure Times
When attached to a telescope the f0.5 focal reducer will typically reduce exposure times to near a quarter when imaging
extended objects like galaxies, nebulae and the Moon.
Telescopes with low focal ratios require shorter exposures when imaging extended objects (for example an f/8 system will
require four times the exposure of an f/4 system). This does not apply to non extended objects (point sources) like stars where
aperture dictates what can be seen/captured.