Refractors
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Achromatic and APO refractor telescopes
Apochromatic refractors for astrophotography and observation
APM Telescopes offers here apochromatic refractor telescopes with especially high contrast imaging. These apos convince by a special optical quality and a reasonable price.
You will find here, besides our own brand, all important manufacturers of APO telescopes, like TS-Optics, Altair, LZOS, Explore Scientific, Skywatcher and many more.
- Aperture 61 mm / Focal length 300 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
Characteristics:
- 3 lens Apochromat with FPL-53 element
- Aperture132mm, focal lenght 910mm, f/6.9
- Optimized OTA
- Attachable WO flatteners / correctors
- 3.3" R&P focuser
- Field illumination even for full frame sensors
Characteristics:
- 3 lens air spaced FPL-53 / lanthanum design
- Aperture156mm, focal lenght 1217mm, f/7.8
- Optimized OTA
- Attachable WO flatteners / correctors
- 3.7" R&P focuser
- Field illumination even for full frame sensors
- High quality 3 lens optics with FPL53 lenses
- CNC tube
- Massive 3.3" R&P focuser with 1:10 reduction ratio
- Focal length 780mm
- Aperture 120mm
- Focal ratio f/6.5
- APS-C and Fullframe Format
The new ZenithStar 61 are the most versatile and lightest apos from William Optics.
- High-quality optics with FPL53 lenses
- Universally applicable for nature and astronomical observations
- Ideal for astrophotography
- An ideal travel instrument
- Precise R&P focuser with 1:10 gear reduction
The FLT 91 is the perfect apochromatic refractor for visually and photographically observing astronomers who demand the most from a medium-sized telescope.
- Three-element design with FPL53 glass
- 91 mm aperture, 540 mm focal length
- Rack and pinion focuser with gear reduction and "Rotolock" clamp
- Field rotator with degree markings and position lock
- Prism rail according to Vixen standard
- Versatile handle with Vixen standard finder shoe
- William Optics' patented Bahtinov mask
Colour variants:
- Red (standard)
- Grey
- Gold
The Gran Turismo refractor is an apochromatic triplet with FPL-53 element for highest colour purity and strong contrast! A refracting telescope that is versatile and leaves little to be desired.
- An ideal travel instrument
- High-quality 3-lens optics
- Can be used visually and photographically
- 2.5" focuser with 1:10 gear reduction
- Supplied with focus mask according to Bahtinov
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 FPL53 triplet lens with air gap
- 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
Innovative and revolutionary William Optics design combines precise internal focusing with the highest quality optics available to create the ultimate apochromatic refractor for astrophotography
- FPL53 Triplet Lens
- Aperture 81 mm, focal length 480 mm
- Internal focusing prevents image shift and vignetting
- Saddle bar handle for mounting the guiding telescope
- Incl. test report
- Incl. carrying bag
William offers with the REDCAT71 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 precise helical focuser like 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
- Dual element design with FPL53 glass
- Massive 2.5" R&P focuser
- CNC machined ALU tube
- High quality tube clamps and mounting plate
- Integrated handle
- Two element APO design with FPL53 glass
- Massive 2.5" R&P extension with 1/10 gear reduction
- High quality CNC machined ALU tube
- With tube clamps, mounting handle and mounting plate
