Adjustable 2.5" Reducer for 102mm to 155mm telescopes

Starfield Optics

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Product Overview

The Starfield 0.8x adjustable reducer and flattener 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 not 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 and then set the reducer to the number that is calculated. The reducer attaches directly to the telescope focuser by removing the Axil lock.
These reducers can be used on other manufactures telescopes as well. A M63 to 2" push adapter might be required. Please contact us for details.
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
Filters can be added inside the reducer.
Design :Corrector and reducer for refractor telescopes
Telescopic connection :M63x1 external thread
Camera connection :M48x0.75 external thread
Reduction factor :0.8 x
Lenses :3 lenses with ED element
Coating :multi-coating and internal blackening
Working distance :variable (adjustable) Adjustment range of the distance :0-17 mm stepless Suitable for :Refractor telescopes from 102 mm to 155 mm aperture with focusers from 2.5"


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