William Optics AFR-IV 0.8x Reducer Flattener IV
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William Optics AFR-IV 0.8x Reducer Flattener IV

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About this product

Model:  William_Optics_AFR-IV
Part Number:  P-FLAT4

Latest version! 

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).

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.

SpecificationTechnical 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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