Starfield 0.8x Adjustable Reducer for 2.5'' Focuser
 Starfield 0.8x Adjustable Reducer for 2.5'' FocuserStarfield 0.8x Adjustable Reducer for 2.5'' Focuser 

Starfield 0.8x Adjustable Reducer for 2.5" Focuser

£220.00✓ 2 year warranty


Out of stock due 10-15 working days

About this product

Model:  starfield_FFRA08_25
Part Number:  SF-FFRA08-

Starfield FFRA08-2.5 Inch 0.8x Reducer/Flattener for 102mm to 155mm refractors

The Starfield 0.8x adjustable reducer and flattener make 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 dial in the required back focus.

Just add up the thickness of all the accessories, plus the distance to your sensor and subtract from 69.87 and then set the reducer to the number that is calculated. The reducer attaches directly to the ED102 telescope focuser by removing the Axil lock.
These reducers can be used on other manufacturers' telescopes as well. An M63 to 2" push adapter might be required. 
Using a 1.5mm Allen key, loosen off the three screws a half turn and then unscrew the lock. Thread the reducer onto the focuser. This Reducer can also be used for other Telescopes lager than 102mm
Total Back focuser required based on Telescope model.

102 mm / focal ratio f/7 - 69.87 mm 

107 mm / focal ratio f/6.5 - 69.0 mm 

130 mm / focal ratio f/7 - 66.17 mm 

140 mm / focal ratio f/6.5 - 65.8 mm 

150 mm / focal ratio f/8 - 63.34 mm 

155 mm / focal ratio f/8 - 62.57 mm 

A 2" Filter can be added inside the reducer.

Suitable for: Refractor telescopes from 102 mm to 155 mm aperture with focusers from 2.5"

Telescopic connection: M63x1 external thread 

Camera connection: M48x0.75 external thread

Reduction factor: 0.8 x

Lenses : 3 lenses with ED element 

Coating: fully multicoated and internal blackening 

Working distance: variable (adjustable)

Adjustment distance range : 0-17 mm stepless 

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