Focal Reducers for Refractor Telescopes

The Starfield 0.8x Reducer doubles as a field flattener.   The unique optical accessory is a must for anyone that is imaging with a DSLR or dedicated astronomy camera.  What makes this reducer different over all the others?   The M42 connection is removable and can be replaced with an optional M48 threaded adapter for Full Frame camera's. 

Providing pin point stars across the field of view, the Starfield 0.8x reducer/flattener decrease the focal length of your imaging refractor.   Designed to be used with a refractor, f/5.5 and longer, with a 2" focuser, and requires 55mm of back focus.  Perfect for any DSLR imager.  No additional extension rings are required.  With 38mm's of clear aperture the chance of vignetting is removed, and is well suited for APS-C sized and smaller sensors.  A 42mm clear aperture when the optional 48mm T-Ring adapter is used.  Your imaging sessions will benefit with shorter exposure times and a larger field of view.  A standard T-Ring is required.  Canon T-Rings should be 11mm, and Nikon 8.5mm.   

Multi-coated optics housed in a high polish, and hard anodize finished aluminum body to help reduce weight.  This all metal constructed accessory will look like jewelry for your telescope.

Includes standard M42 T thread for camera connection, and 48mm filter thread to add your favorite light pollution filter.    

 The Starfield 0.6x Reducer doubles as a field flattener.   The unique optical accessory is a must for anyone that is imaging with a DSLR or dedicated astronomy camera.  

Providing pin point stars across the field of view, the Starfield 0.6x reducer/flattener decrease the focal length of your imaging refractor.   Designed to be used with a refractor, f/6 and longer, with a 2" focuser, and requires 55mm of back focus.  Perfect for any DSLR imager.  No additional extension rings are required.  The 42mm clear aperture remove the chance of vignetting and is well suited for APS-C and smaller sensors.   Your imaging sessions will benefit with shorter exposure times and a larger field of view.  A standard 10mm T-Ring is required.  

Multi-coated optics housed in a high polish, and hard anodize finished aluminum body to help reduce weight.  This all metal constructed accessory will look like jewelry for your telescope.  Includes 48mm filter thread to add your favorite light pollution filter.    

The Starfield 0.8x adjustable reducer and flattener makes finding the correct back focus easy!  Fighting with adapters ands spacers is a thing of the past! 

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 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 distance on the table below and then set the reducer to the number that is calculated.

The reducer attaches directly Starfield telescope focuser by removing the 2" adapter.  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

Large Reducer

• 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

Small Reducer

• 70 mm / focal ratio f/6 - 61.6 mm
• 80 mm / focal ratio f/6 - 59.6 mm
• 80 mm / focal ratio f/7 - 57.6 mm
• 90 mm / focal ratio f/6.5 - 56 mm
• 102mm / focal ratio f/8 - 55 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" (Large Reducer)

                            Refractor telescopes from 70 mm to 102 mm aperture with focusers from 2.5" (Small Reducer)