Apochromatic Refractors

New Vixen SD103SII apochromatic high-performance refractor with FPL53 SD glass and improved optical properties for demanding observers and astrophotographers

• Apochromatic high-performance refractor with FPL53 ED glass
• Reduces chromatic aberration to an absolute minimum
• Guarantees enormously high contrast and excellent sharpness
• You get a very colour-pure, sharp and neutral image
• Very light and transportable, ideally suited for mobile applications
• Fully-coated 103 mm SD lenses without spacer plates
• No more unwanted spikes visible on the stars
• High-quality standard "Made in Japan"
• Dimensions: 115 x 810 mm
• Weight: 5.5 kg with accessories

The Ultra-Cat 56 is a high-performance 56 mm apochromatic refractor, designed for astrophotographers who demand exceptional clarity and true color accuracy.

• Aperture 56 mm, focal length 269 mm
• Focal ratio f/4.8
• Optical design according to Petzval with integrated corrector (five elements in total)
• No flattener necessary
• Temperature-stable lens cells
• Clear and sharp image even when using a full frame sensor
• William Optics Internal Focus Design (WIFD)
• 30 mm focuser travel
• Rotator and tilt flange included
• Patented multifunctional handle
• Connection on camera side: M54, M48

The special feature of the 140mm SD APO with Riccardi Reducer:

• Very high quality processed and of convincingly good optical quality
• Colorless optics with FLP53 glass
• Precise 2.5" focuser with 1:10 mirco reduction for heavy accessories
• With f / 7 ideal for visual
• With f/5,25 ideal for photographic purposes with Riccardi Reducer
• CNC tube rings
• Carry handle
• Very good value for money

The Askar 203APO is one of the largest apochromatic refractors from series production - a powerful refractor for your observatory

• Aperture 203 mm - focal length 1421 mm - focal ratio f/7
• Air-spaced triplet APO objective with one ED element
• Stable 3.5" RAP focuser with speed reduction and 100 mm travel
• Working distance suitable for photo correctors and 2? accessories for observation
• Suitable for EAF motorized focus
• Two finder shoes - 1x for finder - 1x for mini guide scope

100 mm (4”) f/700 ED apochromatic refractor telescope

• Maximum useful magnification: 200x
• Aperture: 100 mm
• Focal length: 700 mm (f/7)
• Dual-speed 11:1 2" Crayford focuser
• 2.8" extension tube with scale and 360º rotation adapter
• Multi-coated lens with MHTC coating
• Slide-in dew cap
• 2" eyepiece connection
• Viewfinder shoe compatible with all Sky-Watcher viewfinders
• Tube rings with handle
• 45 mm prism rail
• Aluminium OTA with light shields
• OTA length: 570 mm (dew cap inserted), 675 mm (dew cap extended)
• OTA weight: 5.5 kg

Translated with DeepL.com (free version)

SV503 Astronomical Telescope 102mm F7 ED Refractor OTA

• 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.