photographic adaptors

William Optics 2" APO Adjustable Flattener / 0.8x Reducer For 500mm-1000mm Refractors - P-FLAT4

William Optics   ——   SKU: WIL-P-FLAT4
$397.16 CAD
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Product Info


About the William Optics P-FLAT4 Adjustable Flattener/0.8x Reducer...

This revolutionary William Optics P-FLAT4 Adjustable Flattener / 0.8x Reducer was made for 500-1000mm refractors.


The Super-Transmission-Coated with 2-element lens system was designed and produced by William Optics, the inner flattener lenses can be set at the optimum 66mm-86mm back focus distance (Distance from flattener lens to film or CCD plane).


The William Optics P-FLAT4 Adjustable Flattener / 0.8x Reducer is a must-have for refractor astrophotography.



William Optics P-FLAT4 Adjustable Flattener/0.8x Reducer Features...


  • Designed to cover full size DSLR cameras with clear lens aperture of 50 mm



  • STM coated with an excellent doublet air spaced design.



  • Produced entirely with the best Ohara optical glasses.



  • 35mm for full illuminated imaging circle.



  • It will flatten the field amazingly well and finally make you see those stars round!



  • This unique flattener works with WO or other 500-1000mm focal length refractors.



  • Superb William Optics anodized finish.



  • All internal surfaces threaded and blackened for no reflections.



  • Rotating T-ring thread for any 35mm camera. The T-ring adapter is provided with a lock screw and extra lock retaining screws.



  • Will accept any standard T-ring for your camera.



  • Inserts directly into 2" focuser.



  • Suitable for : FLT98, FLT110, FLT132 and many others.



William Optics P-FLAT4 Adjustable Flattener / 0.8x Reducer Specifications...

High-quality full multi-coatings

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

William Optics Product Number: P-FLAT4