William Optics new AFR-IV Adjustable Flattener is designed for refractors with 500-1000mm focal-lengths.
Fully multi-coated 2-element unit using Ohara glass. The inner flattener lenses can be easily set at the optimum 66-86mm back focus (distance from flattener lens to film or CCD plane).
Super tough and grippy outside body, smooth twist operation, Produced entirely with the best Ohara optical glasses
http://www.williamoptics.com/accesso...4_features.php
http://www.optcorp.com/william-optic...attener-4.html
In as new condition with no scratches or dust. With original caps but not in original box.
Was used with the ATIK EFW2 I also have for sale, just screw on to the filter wheel and slide the reducer and wheel into your focuser.
$200 delivered.
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