Apochromatic Refractors
- Home /
- Telescopes /
- Refractors /
- Apochromatic Refractors
Apochromatic Refractors
We can offer you a range of very high quality refractors in this category. These include e.g. our two- and three-lens APM Apo instruments, our astrograph series, available as APM or APM-LZOS models. Equipped with Riccardi reducers / correctors or as a high-end version CNC LW II with Feathertouch extracts. All around excellent instruments that should leave no wishes.
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
- 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
![William RedCat 71WIFD - 71 mm f/4,9 Flatfieldrefraktor für Astrofotografie [REDCAT71WIFD]](https://www.apm-telescopes.net/images/thumbs/0655527_william-redcat-71wifd-71-mm-f49-flatfieldrefraktor-fur-astrofotografie-redcat71wifd_640.jpeg "William RedCat 71WIFD - 71 mm f/4,9 Flatfieldrefraktor für Astrofotografie [REDCAT71WIFD]")
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
The special feature of the 140mm SD APO:
- 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
- &CNC tube rings
- Carry handle
- Very good value for money
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.
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
