Starfield Adjustable 1.0x Flattener for 80-155mm Telescopes

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About this product

Starfield 1.0x Adjustable Flattener for 80-155mm telescopes. 

The Starfield 1.0x adjustable flattener makes finding the correct back-focus easy! Fighting with adapters is a thing of the past!

Setting the adjustment required for your telescope makes achieving the correct amount of back focus simple. If more adjustment is needed for fine-tuning, all that is required is a slight twist.

If you use accessories such as filter wheels and rotators, add the thickness of all the accessories, plus the distance to your sensor, subtract from 69.87, and then set the reducer to the calculated number.

The reducer attaches directly to the Starfield telescope focusers. 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.

Back Focus Settings

80 mm f/6 - 81.2 mm

90 mm f/6 - 82.5mm

102 mm f/7 - 75.3 mm

115 mm f/7 - 73.0 mm

130 mm f/7 - 69.7 mm

140 mm f/6.5 - 68.0 mm

155 mm f/8 - 57.0 mm

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