StarField 0.8X Adjustable 2.5" Reducer Corrector - SF-FFRA-08-2.5

• 2.5" Adjustable 0.8x Reducer Corrector
• 3 Element ED lens design
• Adjustable to reach 55mm with no adapters
• Adjustable Distance Range - 0-17 mm stepless
• Designed for 102mm - 155mm telescopes with 2.5" or larger focusers
• M63x1 external thread - telescope side
• M48x0.75 external thread - camera side

The Starfield 0.8x adjustable Reducer Corrector makes finding the correct back focus easy!  Fighting with adapters is a thing of the past! 

By setting the adjustment to 14.87mm with the scale, achieving 55mm of back focus is simple, and if more adjustment is needed for fine tuning all that is needed is a small twist.    If you are using accessories such as filter wheels and rotators you can  still get the required back focus.   Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87.  Then set the reducer to the number that is calculated.

The reducer attaches directly to the ED102 telescope focuser by removing the Axil lock.  Using a 1.5mm Allen key, loosen the three screws a half turn and then unscrew the lock.  Thread the reducer onto the focuser.   

This Starfield Adjustable Reducer can also be used for other telescopes larger than 102mm.  As long as the telescope has at least a 2.5" focuser and isn't larger than 155 mm, you should be fine! 

• 102 mm with focal ratio of f/7 - 69.87 mm
• 107 mm with focal ratio of f/6.5 - 69.0 mm
• 130 mm with focal ratio of f/7 - 66.17 mm
• 140 mm with focal ratio of f/6.5 - 65.8 mm
• 150 mm with focal ratio of f/8 - 63.34 mm
• 155 mm with focal ratio of f/8 - 62.57 mm