--- product_id: 499984920 title: "SVBONY SV209 Field Flattener, 1.0X Flattener for SV550 80mm APO Telescope | Improve Fringe Field Curvature, Corrects The Field, FMC Coating, M63x1 Connection, with Extension Tube, for Astrophotography" brand: "svbony" price: "$260.12" currency: USD in_stock: true category: "Svbony" url: https://www.desertcart.us/products/499984920-svbony-sv209-field-flattener-1-0x-flattener-for-sv550-80mm store_origin: US region: United States of America --- # 45mm large field supports full-frame cameras 1.0X field flattener for sharp astrophotos M63x1 connection with extension tube included SVBONY SV209 Field Flattener, 1.0X Flattener for SV550 80mm APO Telescope | Improve Fringe Field Curvature, Corrects The Field, FMC Coating, M63x1 Connection, with Extension Tube, for Astrophotography **Brand:** svbony **Price:** $260.12 **Availability:** βœ… In Stock ## Summary > 🌌 Capture the cosmos in flawless focusβ€”because your night sky deserves perfection! ## Quick Answers - **What is this?** SVBONY SV209 Field Flattener, 1.0X Flattener for SV550 80mm APO Telescope | Improve Fringe Field Curvature, Corrects The Field, FMC Coating, M63x1 Connection, with Extension Tube, for Astrophotography by svbony - **How much does it cost?** $260.12 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/499984920-svbony-sv209-field-flattener-1-0x-flattener-for-sv550-80mm) ## Best For - svbony enthusiasts ## Why This Product - Trusted svbony brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Durable FMC Coating:** Fully multi-coated optics ensure maximum light transmission and contrast for stunning astrophotography - β€’ **Edge-to-Edge Clarity:** Eliminates fringe field curvature for crisp stars across your entire frame - β€’ **True Focal Integrity:** Maintains original focal length and focal plane for seamless integration with SV550 80mm APO - β€’ **All-in-One Convenience:** Includes M63 extension tube, M48 adapter ring, and built-in 2-inch filter threadβ€”no extra adapters needed - β€’ **Universal Camera Compatibility:** Supports both half-frame and full-frame cameras with a 45mm effective field of view ## Overview The SVBONY SV209 Field Flattener is a precision 1.0X optical accessory designed specifically for the SV550 80mm APO telescope. It corrects fringe field curvature without altering the focal length or focal plane, delivering sharp, edge-to-edge images. Featuring a large 45mm field of view, it supports both half-frame and full-frame cameras. The package includes an M63 extension tube, M48 adapter ring, and a built-in 2-inch filter mounting thread, eliminating the need for additional adapters. Fully multi-coated optics enhance light transmission, making it an essential upgrade for serious astrophotographers seeking professional-grade image quality. ## Description Buy SVBONY SV209 Field Flattener, 1.0X Flattener for SV550 80mm APO Telescope | Improve Fringe Field Curvature, Corrects The Field, FMC Coating, M63x1 Connection, with Extension Tube, for Astrophotography: Hunting Knife Sharpeners - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases ## Features - SV209 is a special field flattener for SV550 80F6 OTA; which can effectively improve the image quality problem of SV550 OTA fringe field curvature - SV209 keeps the focal length and focal plane position of the primary mirror unchanged while improving the field curvature problem - The package of SV209 is equipped with an M63 extension tube and an M48 adapter ring to ensure that the back focal length of the flat field mirror is the astronomical conventional 55mm length - The effective field of view of the 45mm large target surface supports not only half-frame cameras; but also full-frame cameras - Built-in 2-inch filter mounting thread; supports 2-inch filter installation; customers do not need to buy a filter adapter ring separately ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0B31NQKJJ | | Additional Features | Corrects field curvature, maintains focal length and focal plane position, supports half-frame and full-frame cameras, includes M63 extension tube, M48 adapter ring, and built-in 2-inch filter mounting thread | | Best Sellers Rank | #496,516 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #1,000 in Sporting Optics Accessories #56,708 in Hunting Equipment | | Brand | SVBONY | | Compatible Devices | Telescope, Telescope Camera, Telescope Filter | | Customer Reviews | 4.1 4.1 out of 5 stars (14) | | Eye Piece Lens Description | no | | Focus Type | Fixed Focus | | Item Dimensions D x W x H | 4.5"D x 4"W x 4"H | | Manufacturer | SVBONY | | Manufacturer Part Number | FCAW9161A | | Model Name | FW9161A | | Model Number | FCAW9161A | | Mount | no | | Number of Items | 1 | | Unit Count | 1 Count | | Warranty Description | We provide 1 year warranty for SVBONY telescope accessories and 30 days no reason to return. Beyond the warranty period: We still offer maintain service, buyers are required to afford corresponding costs. We processed in the most hassle-free way possible.You just need to contact with us on Amazon ,we will reply you within 12 hours | | Zoom Ratio | 1x | ## Product Details - **Brand:** SVBONY - **Compatible Devices:** Telescope, Telescope Camera, Telescope Filter - **Eye Piece Lens Description:** no - **Focus Type:** Fixed Focus - **Manufacturer:** SVBONY - **Model Name:** FW9161A - **Product Dimensions:** 4.5"D x 4"W x 4"H - **Telescope Mount Description:** no - **Unit Count:** 1 Count - **Zoom Ratio:** 1x ## Images ![SVBONY SV209 Field Flattener, 1.0X Flattener for SV550 80mm APO Telescope | Improve Fringe Field Curvature, Corrects The Field, FMC Coating, M63x1 Connection, with Extension Tube, for Astrophotography - Image 1](https://m.media-amazon.com/images/I/61uPCxw22IL.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - SVBONY SV209 Field Flattener, 1.0X Flattener Corrects The Field, FMC Coating, M63x1 Connection, for SV550 80mm F6 APO OTA Astrophotography - SVBONY SV550 APO Triplet Refractor, 80mm F6 OTA with Micro-Reduction Rap Focuser, Portable Telescope Adults for Deep Sky Astrophotography and Visual - SVBONY SV211 Dovetail Base, Finderscope Mount Bracket, 135mm Telescope Handle Bar, to Handle Telescope and Installation of Finder Scope for Optical Telescope --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/499984920-svbony-sv209-field-flattener-1-0x-flattener-for-sv550-80mm](https://www.desertcart.us/products/499984920-svbony-sv209-field-flattener-1-0x-flattener-for-sv550-80mm) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-16*