About this product
Part Number: SF-08-90
This Starfield 0.8x adjustable reducer / flattener makes finding correct back focus easy.
Setting the adjustment to 14.87mm with the scale, achieving 55mm of back focus, is straightforward. Further adjustments for fine tuning can also be applied, with a small twist.
If you are using accessories such as filter wheels and rotators, simply add up the thickness of the accessories, add the distance to your sensor, subtract the total from 69.87, then set the reducer to the number calculated.
The reducer attaches directly to the Starfield 102 ED telescope focuser by removing the Axil lock. Using a 1.5mm Allen key, loosen the three screws a half-turn, unscrew the lock then thread the reducer onto the focuser.
Can also be used with other Telescopes larger 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
Telescope connection: M63x1 external thread
Camera connection: M48x0.75 external thread
Reduction factor: 0.8x
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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