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. In my experience with the Z73, the combination of 430mm at F/5.9 was just right for collecting long exposure astrophotography images of the Butterfly Nebula and Heart Nebula. It is full frame ready and was designed for . This accessory is a must-have for refractor astrophotography. William Optics 0.72x focal reducer/field flattener P-FLAT8 The large 50mm clear aperture lens will reduce vignetting to almost nil. William Optics 2" APO Field Flattener and 0.8x Focal Reducer WE-FLAT-3 is part of our massive variety of . William Optics Adjustable Flat6AIII for FLT91 - David Astro FLAT6AIII special edition for Fluorostar 91 . This William Optics 0.8x Flattener/Reducer has been designed to optimize the flat-field imaging performance of William Optics GT71, GT81, Z81 & Z103 refactors. £39.00 Add to Basket. William Optics 2" APO Field Flattener and 0.8x Focal Reducer WE-FLAT-3 Shop William Optics 2" APO Apochromatic Field Flattener and 0.8x Focal Reducer for 66mm to 90mm Refractors WE-FLAT-2 | 5 Star Rating on 1 Review for William Optics 2" APO Apochromatic Field Flattener and 0.8x Focal Reducer for 66mm to 90mm Refractors WE-FLAT-2 + Free Shipping over $49. What I've done is measure the FL back from the primary lens. Flattener / Reducer; Astronomy Filters. What is this doing, and what magnification would I get with a 25mm eyepiece? William Optics 2" APO Field Flattener and 0.8x Focal Reducer WE-FLAT-3 Free US Shipping. This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7.5 ratio refactors. This revolutionary new William Optics AFR-IV Adjustable Flattener / 0.8x Reducer was made for 500-1000mm refractors. William Optics 2" APO Field Flattener and 0.8x Focal Reducer is especially recommended for users of the William Optics Megrez 80, 90 and 110. First Light: William Optics Flat6A III Flattener & 0.8 Reducer ... with a thumbscrew to lock it into place! Vixen Focal Reducer For VC200L £241.00. The focal reducer for the AX103S Refractor telescope is designed for APS-C format cameras. William Optics New Adjustable Flattener 61A for Z61 and GS61 - P-FLAT61A. Product Details. The Z61 is the most portable telescope ever made by William Optics, a company with a reputation for building beautiful astrophotography refractors.. Additionally, the 0.8 reducer reduces the focal length of the GT-81 from 478 mm to 382 mm and brings down the focal ration from f/5.9 to f/4.7. William Optics 0.8x Reducer & Field Flattener 73R for ZenithStar 73 Brand new adjustable field flattener and 0.8x reducer for the William Optics Zenithstar 73 OTA. Reviews & Ratings for William Optics 2" APO Apochromatic Field ... The Evoguide wins hands down here. In Stock. . William Optics 0.72x focal reducer/field flattener P-FLAT8 William Optics Zenithstar 73 APO Review | AstroBackyard Adjustable reducer flattener Flat73R for Z73 . New William Optics Flattener 68III . This high-quality flattener has been engineered and CNC machined for usage with William Optics' GT153, FLT 132, 102GTS, and other APO refractors. It threads onto the rear cell of 5" to 16" Celestron and Meade Schmidt-Cassegrain telescopes, making it possible to have a dual focal ratio instrument without sacrificing image quality.