• Large 122mm aperture; f/7 focal ratio and 854mm focal length; a great travel telescope for astrophotography and observation; and even some fainter deep sky objects due to the higher limiting magnitude;
• FPL-51 triplet apochromatic lens structure; the astro refractor telescope contains one piece of ED glass, for better correction of aberration, greatly reduce chromatic aberration and enhance the clarity & sharpness;
• Dual speed 2.5-inch toothed focuser with 1: 10 gear ratio; easy to achieve accurate focus; the dual speed focuser can provide two focusing speeds by using a set of co-axial knobs; for fast focusing and fine focusing;
• 300mm dovetail length; it can maintain the balance to the greatest extent; and more convenient in the adjustment process;
• Carrycase included; this telescope bag has a removable shoulder strap and hand-carry strap.

(Note: The bag is included in the OTA, so you needn't buy one separately. For extra accessories, pls choose our bundle set)

Review Video by @NebulaPhotos   Unboxing Video

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• Use this APO OTA apochromatic refractor to reveal the wonders of celestial bodies; you can observe the Messier catalog targets; the common shooting targets M42 M45; the difficulty factor is simple
• The triplet apochromatic optics structure (1 piece of S-FPL51 low-dispersion ED glass and 2 pieces of correction glass) effectively improves the blue-edge chromatic aberration problem of single-ED structure imaging
• The telescope uses an air-spaced triple optical design that virtually eliminates chromatic aberration; resulting in bright; high-contrast images for exploring galaxies with better graphic clarity
• This little scope also includes the use of a 2.5-inch magnesium alloy dual-speed toothed focus mount (1:10); which reduces vignetting on full-frame cameras and reduces the weight of the support platform
• This APO adopts extreme extinction measures; there are multiple light barriers inside the focusing seat and the inner wall of the lens barrel; and 4 extinction barriers are designed to meet the ultimate pursuit of extinction

Note: This SV550 80 OTA comes with a dedicated dovetail slot for the finderscope.

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• ED Glass structure: The doublet air-spaced achromatic design with S-FPL51 ED glass reduces chromatic aberration, delivering crisp, accurate color images;
• Large aperture for bright images: The 102mm objective lens with an f/7 focal ratio brings more lights into the scope body and you will get more bright and clear image;
• FMC-coating for crisp image: Ultra-wideband multi-layer coatings and a retractable lens hood provide bright, wide-field images with sharp resolution, perfect for various types of observation;
• Dual-speed rack focuser: The 90mm back focus and dual-speed rack and pinion focuser with focus knob cover make it easy to achieve fine, accurate focus for both visual and photography.

Get the 0.8x Reducer & Flattener for SV503 102ED

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• Extra-low dispersion (ED) glass: The SV503 80mm features ED glass for high-contrast, crystal clear, color-accurate images, perfect for discerning observers;
• Fully Multi-Coated Optics: The whole optical lens adopts the technology of ultra-wideband multilayer coating.Fully multi-coated ED optics deliver outstanding views during day or night;
• Dual-Speed Focuser for Precision: Featuring a 1:10 dual-speed rack and pinion focuser, the 2-inch toothed focuser allows for smooth and precise focusing adjustments, ensuring sharp images for both visual observation and astrophotography;
• Top-quality material: The appearance of the SV503 OTA is baked with high-end fine-grained paint,with exquisite appearance and delicate feel,all machined by CNC;
• Areas of application:SV503 80mm F7 telescope would be better begin for astronomy amateurs to do astrophotography.

Get 0.8x Reducer/Flattener for SV503 80ED

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• 90 mm aperture; 500mm focal length; compared with 70mm and 80mm; 90mm telescope has more light input and a wider field of view; observe the moon and deep space; which is very suitable for astronomy beginners
• Double speed focuser; the 2 inches rotatable double speed focuser; gear ratio of 1:10; precise adjustability for smooth operation
• The focusing mount with metal interface has higher interface accuracy; guarantees the parallelism of the optical axis; and enhances the observation experience
• Fully multil green coated lens; fitted with achromatic glass for good edge-to-edge viewing; fully multi green coated lens maximize light transmission eliminating false color
• 360 degrees rotation; convenient for photographic composition and visual observation; loosen the screw; the focus can be rotated 360 degrees; you can achieve astronomical shooting

Best Christmas Telescope for Kids and Astronomy Beginners

• 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.

SV193 Connect with 1.25inch SV705C Camera

• 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.

• Compact and portable: the length of MK105 is 14.84inch,tube net weight is 4.83lb, for astronomical telescopes with the same focal length; the overall length of the telescope is only about half of that of the refractor telescope; 
• Eliminate the need for periodic collimation: MK105 Maksutov-Cassegrain Telescope exchanges the conventional front corrector plate of a Schmidt with a convex meniscus lens, resulting in a smaller secondary mirror that limits obstruction and increases contrast, while eliminating the need for periodic collimation;
• Metal mirror body: the metal mirror structure for MK105 ensures the stability of the optical structure during transportation;
• Electrolyte coating technology: MK105's secondary mirror coating adopts high-reverse electrolyte coating technology; which greatly improves the imaging contrast of observation targets such as planets;
• The barrel of the MK105 telescope adopts the design of double star-seeking bases; one built-in base and one leaky base; which is convenient for customers to connect more necessary astronomical accessories.

Note: Mk105 was compatible with the ZWO EAF

Best Christmas Telescope for Kids and Astronomy Beginners

• 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.

SV193 Connect with 1.25inch SV705C Camera