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I have for sale an adjustable William Optics field flattener/ focal reducer (0.8x) that has rarely been used and kept in box. I found it perfect for my WO90mm but pretty sure it also works with other refractors between 500-100 focal length.Here is what W.O. says about it:* William Optics 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).* APS size Designed with APS chip-size DSLR cameras in mind. FMC doublet design. Produced entirely with Ohara optical glass.* Convenient Flattens the field remarkably well for nice round stars! Will work with WO 500-1000mm focal length refractors.* Superb Finish William Optics polished anodized finish. All internal surfaces threaded and blackened for no reflections.* Easy to Use Rotating T-ring thread for easy connection to DSLR cameras. The T-ring adapter is provided with a lock screw and extra lock retaining screws. Will accept any standard T-ring. Inserts directly into 2″ focuser.* Technical specs:* Fully multicoated optics* Lens-to-chip distance 66-86mm* Power : 0.75x ~ 0.8x* Rotating T-ring adapter* Clear Aperture : 50mm* L 84mm : W 77mm : H 123mm* Weight : 540 g
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Category: Cameras and Photography:Telescopes and Binoculars:Telescope Parts and Accessories:Adapters
Location: London