Adjustable 2.5" Reducer for ED102 and Gear 115

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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 Starfield ED102 telescope focuser by removing the Axil lock. Using the supplied 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

  • 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 xLenses: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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