• SV193 0.8x focal reducer can take dazzling celestial photos without worrying about the distortion of the star points on the edge of the photo;
• The front is a standard 2-inch socket for connecting the main lens. The rear is a M48x0.75 thread for connecting the camera mount. Supports full-frame cameras
• The SV193 can be connected to a standard 2" filter thread to add the light pollution filter you need；
• The 0.8X defocus system shortens the exposure time. It can meet the needs of astronomical photographers who need sufficient exposure in a short time.

• SV209 0.8X focal reducer/field flattener is designed specifically for prime focus astrophotography with the SVBONY SV550 122mm f/7 apo refractor;
• It can correct the defect of field curvature of the user's shooting target; improve the imaging quality and shooting efficiency of the edge of the field of view;
• It converts the 854mm focal length f/7 refractor into a 683.2mm f/5.6 system for faster and wider field astronomical and terrestrial photography;
• In addition to reducing the focal length of the telescope and thereby increasing the photographic speed, the flattens the normal field curvature inherent in refractors. This provides images that are sharply focused out to the corners of DSLR and CCD imaging chips;
• SV209 0.8x reducer has a metric 63x1 thread; the telescope reducer flattener screws into the focuser to ensure a secure connection.

Unlock the full potential of your telescope equipment for moon observing with our versatile and multifunctional accessories! Introducing the Mk105 Maksutov-Cassegrain telescope OTA,  SV231 Fringe Killer Color Correction Filter 1.25/2inch, SV182 6x30 Right-Angle Correct-Image finder scope, SV188P 1.25inch diagonal, Moon Filter 1.25/2inch, SV183 IR Pass 685nm Filter Telescope Filter 1.25 Inch, 1.25/2inch UV IR Cut Filters, SV135 Zoom Eyepiece 1.25inch 7mm to 21mm, SV505C Color Planetary Camera, SC311 WIFI Astronomy Camera, SV225 AZ-mount, 1.25 inch 0.5x Focal Reducer. You can choose whatever you like.

• SV209 is a special field flattener for SV550 80F6 OTA, which can effectively improve the image quality problem of SV550 OTA fringe field curvature; At the same time, the focal length and focal plane position of the primary mirror remain unchanged;
• 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;
• Maximum working distance from the M63x1 internal thread: 103 mm - space enough for almost all adaptations.

Note: The SV550 80 APO is designed with f/6 focus ratio. When reducing the focus further, the image quality will not be guaranteed. This is why we produce 1.0x flat field instead of 0.8x.

• SV193 0.8x focal reducer can take dazzling celestial photos without worrying about the distortion of the star points on the edge of the photo;
• The front is a standard 2-inch socket for connecting the main lens. The rear is a M48x0.75 thread for connecting the camera mount. Supports full-frame cameras;
• The SV193 can be connected to a standard 2" filter thread to add the light pollution filter you need；
• The 0.8X defocus system shortens the exposure time. It can meet the needs of astronomical photographers who need sufficient exposure in a short time.

• 0.5x focal reducer cuts the telescopes focal length in 0.5 times of original's to get a wider field of view;
• Fully anti-reflection coatings on all air-glass surfaces for increased contrast;
• The focal reducer is great for visual use for a bigger FOV and is indispensable when CCD imaging;
• Fully metal structure design;both the ends of the interface part is 28.5x0.6 thread;
• Directly connect the interface to the eyepiece;there is a very good performance in both visual and photography.