Apochromatic Refractors

The 60F is a very transportable APO refractor for astrophotography with corrected field of view up to full frame format and for observing up to the highest magnification range.

•  Aperture 60 mm / focal length 408 mm / focal ratio f/6.8
•  4-element system with colorless ED triplet objective and one correction element built into the tube
•  44 mm illuminated image circle with very good correction up to full-frame format
•  Stable 2.4" dual-speed RAP focuser with 360° rotation, threaded connections, 2" adapter and 1.25" adapter
•  Sufficient working distance for observation with 1.25" accessories
•  Suitable photo adapters are included in the scope of delivery
•  Tube rings with Vixen/EQ5 style dovetail bar (230 mm) and carrying handle
•  2 finder shoes for standard finders and mini guide scopes included
•  Retractable dew shield
•  Lightweight (2.9 kg) and short (289 mm) - suitable for traveling

The Askar 103APO is a 103 mm aperture, 700 mm focal length, and f/6.8 native focal ratio apo refractor with many useful features and several corrector options.

• Aperture 103 mm - focal length 700 mm - focal ratio f/6.8
• Triplet objective with one ED element
• Stable 3.3" RAP focuser with dual speed, 360° rotation and 100 mm travel
• Sufficient working distance for observing with 2" accessories and for photography
• Flattener and two reducers available (0.6x and 0.8x)
• CNC tube rings with Vixen/EQ5 style dovetail bar and carrying handle
• Two finder shoes

The Askar 140APO is an apo refractor with 140 mm aperture, 980 mm focal length and a focal ratio of f/7 with many practical features.

•  Aperture 140 mm - Focal length 980 mm - Focal ratio f/7
•  Triplet objective with one ED element
•  Stable 3.5" dual-speed RAP focuser with 360° rotation connection and 100 mm adjustment travel
•  Sufficient working distance for observation with 2" accessories and for photography
•  Flattener and two reducers available (0.8x)
•  CNC tube rings with dovetail bar (Losmandy style) and carrying handle
•  Two finder shoes

The Askar 160APO is an apo refractor with 160 mm aperture, 1120 mm focal length and a focal ratio of f/7 with many practical features.

• Aperture 160 mm - focal length 1120 mm - focal ratio f/7
• Air-spaced triplet objective with one ED element
• Stable 3.5" dual-speed RAP focuser with 360° rotator and 100 mm drawtube travel
• Sufficient working distance for observation with 2" accessories and for photography
• CNC tube rings with dovetail bar (Losmandy) and carrying handle
• Two finder shoes

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

The Askar 120APO is a 120 mm aperture, 840 mm focal length, and f/7 native focal ratio apo refractor with many useful features and two corrector options.

• Aperture 120 mm - focal length 840 mm - focal ratio f/7
• Triplet objective with one ED element
• Stable 3.3" RAP focuser with dual speed, 360° rotation and 100 mm travel
• Sufficient working distance for observing with 2" accessories and for photography
• Flattener and reducer (0.8x) available
• CNC tube rings with Vixen GP style dovetail bar and carrying handle
• Two finder shoes
• With optical test by Teleskop-Service on the optical bench (autocollimation) - star test extrafocal, intrafocal and focal as well as Ronchi test and report - so you have a 100% tested telescope

The Ultra-Cat 76 is a powerful apochromatic 76 mm refractor designed for astrophotographers who demand very high sharpness and color fidelity.

• Aperture ratio 1:4.8
• Petzval optical design with integrated corrector (five elements in total)
• Temperature-stable lens cells
• Color-pure and sharp imaging even when using a full-frame sensor
• William Optics Internal Focus Design (WIFD)
• Rotator and tilt flange included
• Patented multifunctional handle
• Camera-side connection: M54, M48

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

William offers with the RedCat 71 WIFD astrograph a very well corrected telescope for astrophotography up to full frame format.

• Aperture 71 mm / Focal length 350 mm / Focal ratio f/4.9
• Petzval design with chromatic aberration free FPL53 objective (4 elements in 3 groups)
• Very well corrected and illuminated image field up to full frame format - the corrector is built in - no more adapter battle necessary
• Camera connection via M48 male thread (suitable adapters are available) - working distance 55 mm
• 360° rotation of the camera for the right display window
• Focusing via internal focusing (William Internal Focus Design - WIFD) as with telephoto lenses
• Tilting option for individual adjustment of the camera sensor to the telescope
• Flexible dovetail bar at the base (long version), suitable for Vixen style and Arca-Swiss saddle plates, in addition with 1/4" female photo tripod thread
• Nylon carrying bag and Bahtinov mask for astrophotography are included in delivery
• WIFD R&P focuser - copatible with EAF

SVBONY SV503 Telescope ED 80mm F7 Doublet Refractor OTA for Exceptional Viewing and Astrophotography

• 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.

The William Optics GT 81 apo stands for optimal chromatic correction and best possible contrast - a powerful travel telescope for observation and photography.

• Aperture 81 mm
• Focal length 480 mm
• Focal ratio f/5.9
• Multicoated, air-spaced FPL53 triplet lens
• 2.5" RAP focuser with M63x1 connection thread, as well as 2" and 1.25"
• Multifunction handle with holder for guide scopes
• Bahtinov mask integrated
• Variable carrier bag
• Vixen/EQ5 style dovetail bar

The William Optics GT 71 Apo stands for optimal color correction and best possible contrast - a powerful travel telescope for observation and photography.

• Aperture 71 mm
• Focal length 420 mm
• Focal ratio f/5.9
• Multicoated air-spaced FPL53 triplet lens
• 2.5" RAP focuser with M63x1 connection thread, as well as 2" and 1.25"
• Multifunction handle with holder for guide scopes
• Bahtinov mask integrated
• Variable carrier bag
• Vixen/EQ5 style dovetail bar
• Golden Edition

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.

Apochromatic refractor AP 130/780 LZOS 3.7-ZTA OTA 

• Our LZOS Super ED 3-lens models come with a test report, meaning that each lens is individually measured using a Twymann interferometer and recorded with the serial number of the lens.
• Maximum Strehl ratio (as with the Zeiss APQ) is guaranteed to be 95% or better.
• Residual chromatic aberration optimized to a minimum.
• Temperature-compensating mount.

This extender is suitable for the Takahashi fluorite apochromats FS-60CB, FS-60Q, FC-76D (both versions), FC-76Q, and FC-100D (all versions). However, it is also compatible with the older Sky-90 and FSQ-106 fluorite models, which are no longer manufactured. Of course, it can also be used with many other devices as a moderate focal length extension.

•  Connection: M43x0.75(pos)
• Extension factor: 1.6x
• Number of lenses: 5

The compact FS-60CB Apo can be upgraded to a 60/600 f/10 quadruplet Apo with this 1.7x Q module. Optically, this version is superior to the FS-60CB ... 

• Extension factor: 1.7x
• Number of lenses: 2

• Connection: M56x0.75
• Extension factor: 1.04x
• Number of lenses: 2

Takahashi Extension Tube (FL), Short Distance Ring

• Connection (object side): M56x0,75(neg)
• Connection (observer side): M56x0,75(pos)
• lightpass: 17,5mm
• Shipping weight:  1kg

Takahashi offers matching 1:7 microfocusers for all telescopes with normal focusers.

• TOA-130(N)S
• TSA-102, TSA-120
• FC-76DS, FC-76DC
• FS-60CB, FS-60Q, FS-60C, FOA-60(Q)
• FS-60CB, FC-76DP
• SKY90
• FS-78, 102, 128N
• FC-65, 76, 100, 100N, 125N
• FCT-65
• MT-130, 160, 200
• Epsilon 130, 160, 180
• Mewlon mit Okularauszug TKA00700

Takahashi offers rotating camera mounts for its telescopes, which are necessary because most of the company's focusers are not rotatable. However, this rotator also makes sense visually, as it allows the ZSP or other accessories to be conveniently rotated into the desired position. The quality is so high that there is no play even when the screw is loosened.

• Connection on the telescope side: M56x0.75 internal thread
• Connection on the camera side: M56x0.75 external thread
• Light path: 12.3 mm
• Weight: 110 g

2'' Connector Takahashi FS-60/78 FC-76DC und FC-100 DC, TKA21110

• Connection (object side): M56x0,75(neg)
• Connection (observer side): 50,8mm(neg)
• lightpass: 39mm

The Esprit-150EDX from Skywatcher offers the highest optical and mechanical quality and is optimized for astrophotography.

• Aperture 150 mm
• Focal length 1050 mm (focal ratio f/7)
• Triplet apo objective with FPL53 ED element
• Improved 3" dual-speed focuser for high payload
• 360° rotation
• 2" connection with additional thread for screw adaptations
• Retractable dew shield
• Carrying handle, Losmandy style dovetail bar, carrying case

The Esprit-120EDX from Skywatcher offers the highest optical and mechanical quality and is optimized for astrophotography.

• Aperture 120 mm
• Focal length 840 mm (focal ratio f/7)
• Triplet apo objective with FPL53 ED element
• Improved 3" dual-speed focuser for high payload
• 360° rotation
• 2" connection with additional thread for screw adaptations
• Retractable dew shield
• Carrying handle, Losmandy style dovetail bar, carrying case

The Esprit-100EDX from Skywatcher offers the highest optical and mechanical quality and is optimized for astrophotography.

• Aperture 100 mm
• Focal length 550 mm (focal ratio f/5.5)
• Triplet apo objective with FPL53 ED element
• Improved 3" dual-speed focuser for high payload
• 360° rotation
• 2" connection with additional thread for screw adaptations
• Dew shield (fixed)
• Carrying handle, Losmandy style dovetail bar, carrying case

The Esprit-70EDX from Skywatcher offers the highest optical and mechanical quality and is optimized for astrophotography.

• Aperture 70 mm
• Focal length 490 mm (f/7)
• Triplet apo objective with FCD100 ED element
• Improved 2.8" dual-speed focuser for high payload
• 360° rotation
• 2" connection with additional thread for screw adaptations
• Retractable dew shield
• Carrying handle, Vixen GP style dovetail bar, carrying case

The powerful ED apo is suitable for observing and astrophotography with an high-contrast image.

• 150 mm aperture, 1200 mm focal length, focal ratio f/8
• High image quality thanks to extra-low dispersion glass FPL53 (Ohara, Japan) and matching glass from Schott
• Highly effective coating for maximum transmission and minimum reflections
• Large rack and pinion focuser with 11:1 reduction for sensitive focusing
• 360° rotation adapter
• Tube in traditional white - heats up less during the day and is more visible at night

120mm (4.75”) f/900 ED Apochromatic Refractor Telescope

• 120 mm aperture, 900 mm focal length, focal ratio f/7.5
• High image quality thanks to extra-low dispersion glass FPL53 (Ohara, Japan) and matching glass from Schott
• Highly effective coating for maximum transmission and minimum reflections
• Large Crayford focuser with 11:1 reduction for sensitive focusing
• 360° rotation adapter
• Tube in traditional white - heats up less during the day and is more visible at night

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)

• Objective Lens Diameter: 80mm
• Telescope Focal Length: 600mm (f/7.5)
• Dual-Speed 11:1 2” Crayford Focuser (Backlash-Free)
• 2.8" Indexed Focuser Drawtube with 360º Rotatable Adaptor
• Multi-Coated Objective Lens with MHTC coatings
• Image Height 30mm (with optional reducer/flattener)
• Retractable Dew Shield
• Drawtube Adaptor to accept 2" Star Diagonal
• Finderscope Mounting Shoe (compatible with ALL Sky-Watcher finderscopes)
• Supplied with Tube Rings with Carrying handle

Fast 70mm high-performance astrograph F5.5 for demanding astrophotographers and observers with 5 lens elements in 5 groups

• Very fast 70mm high-performance astrograph for demanding astrophotographers
• Due to the large lenses there is almost no vignetting
• Complex construction with 5 lens elements in 5 groups for absolute correction
• Needle-thin stars up to the edge of the image field even with 44 x 33 mm camera format
• Large, stable eyepiece extension, also suitable for heavy cameras
• Extremely high sharpness, colour purity and contrast thanks to SD lenses
• Very large field illumination up to 55mm
• High Strehl intensity of 96.7% at visible wavelengths
• Optional reducer available for even faster results
• Optional motor focuser with two speeds can be retrofitted

New Vixen SD115SII 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 115 mm SD lenses without spacer plates
• No more unwanted spikes visible on the stars
• High quality standard "Made in Japan"
• Dimensions: 125 x 920 mm
• Weight: 6.3 kg with accessories

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 very good correction and the self-flattening design make this small telescope a compact photo machine.

• Aperture 65 mm / focal length 416 mm / focal ratio f/6.4
• 5-element system with color clean triplet objective and two corrector lenses built into the tube
• Stable 2.5" RAP focuser with dual speed and 360° rotation
• Sufficient working distance for observation with 2" accessories
• Suitable photo adapters are included in delivery
• Illuminated image circle with very good correction up to full frame format
• CNC tube rings with Vixen style EQ5 dovetail bars and carrying handle
• Finder shoe for standard finder and mini guiding telescopes available

The Askar 185APO is an apo refractor with 185 mm aperture, 1295 mm focal length and a focal ratio of 1:7 with many practical features.

• Aperture 185 mm - Focal length 1295 mm - Focal ratio f/7
• Triplet objective with one ED element
• Stable 3,5" RAP focuser with micro reduction, 360° rotation connection and 100 mm adjustment travel
• Sufficient working distance for observation with 2" accessories and for photography
• Flattener and two reducers available (0.8x)
• CNC clamps with dovetail bar (Losmandy) and carrying handle
• Two finder shoes

An ultimate and compact APO refractor for astrophotography and observation.

• Aperture 110 mm / focal length 528 mm / focal ratio f/4.8
• FCD100 triplet lens with f/6 - chromatic correction comparable to FPL53 triplet
• 4-element 0.8x corrector with M48 camera connection and working distance of 55 mm included - designed for this lens for highest field sharpness
• 2" filter thread and 360° rotation included
• 2" Visual-Back can be screwed to the focuser instead of the corrector for observation - working distance suitable for 1.25" and 2" accessories
• Delivery in high-quality carrying case
• Each apo is tested (cosmetics, optics and mechanics) at Teleskop-Service before shipment, the optics are collimated. The apo is shipped with a checklist.