SVBONY SV209 1.0x Field Flattener Review https://www.youtube.com/watch?v=r6TGd7M1EX0&t=6s Author:Natural Portraits SV209 1.0x Field Flattener The SV209 field flattener is designed for SV550 80F6 OTA, which can effectively correct field curvature and improve the image quality. And 1.0 field flattener -- no change of focal length to the focal plane. Components Adapter: M63x1 & M48x0.75 M48x0.75 female thread for 2" filter M63x1 male thread for connection to telescope Fully illuminated field: 45 mm Featuring 45mm large target area effective field of view, SV209 not only supports half frame camera, also full frame camera. Working Distance: 55mm/ 91.5mm/ 103mm Working distances: 55 mm and 91.5mm (if you leave out the M63 extension). Maximum working distance with M63x1 internal threads: 103 mm - space is enough to accommodate almost all adjustments. Specification: 1.Brand: SVBONY 2.Model: SV209 3.Connection at telescope side: M63x1 male thread 4.Connection 1 at camera side: M63x1 thread female - working distance 103 mm 5.Connection 2 at camera side: M48x0.75 male thread - working distance 55 mm or 91.5 mm 6.Fully illuminated field: 45 mm（Support Full Frame Sensors） 7.Number of elements: 2 lenses 8.Factor: 1.0 - no change of focal length to the focal plane 9.Coating: FMC 10.Diameter of the housing: 67mm 11.Length: 87.5 mm without the male thread

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