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Opticstar - Focal Reducer - F 0.5 Focal Reducer for 1.25 " Telescope Nosepieces

Model#: OSRFR105

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Availability: In stock

Regular Price: $38.00

Special Price: $36.10

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Manufactured by: Opticstar

Details

Opticstar Focal Reducer F 0.5 Focal Reducer for 1.25" Nosepieces

 


  • F 0.5 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.

 

 

 

Additional Information

Name Opticstar - Focal Reducer - F 0.5 Focal Reducer for 1.25 " Telescope Nosepieces
Manufacturer Opticstar
Model OSRFR105