William Optics

• Very high quality optics
• Universal use (as a guider or astrophotographic telescope)
• Compatible with Flattener 61
• Usable as guider with 360mm focal length for primary optics with focal lengths between 700mm and 1200mm

Compact 50 mm f/4 guide scope with 1.25" connector - can be mounted on your telescope instead of the finder - perfectly suitable for ZWO mini autoguider and similar ones

• Aperture 50 mm
• Focal length 200 mm
• Weight only 520 grams
• Camera side connection 1.25" - clamping by Rotolock - clamped as screwed
• Sharpness adjustment by turning the objective - with lock ring
• Adjustable working distance of 0-15 mm behind the eyepiece clamp - suitable for all autoguiders with 1.25" body, such as ASI120 Mini
• Easy connection to the telescope instead of the finder, suitable for Skywatcher, TS-Optics, GSO, Vixen, Celestron, etc.

Kompaktes 32 mm f/3,75 Guidescope mit T2 und 1,25" Anschluss - kann anstelle des Suchers an Ihr Teleskop montiert werden

• Öffnung 32 mm
• Brennweite 120 mm
• Gewicht nur 240 Gramm
• Kameraseitiger Anschluss T2 (M42x0,75) und 1,25"
• Schärfeeinstellung durch Verdrehen des Objektives - mit Konterring
• Einstellbarer Arbeitsabstand von 0-25 mm hinter dem T2 Gewinde - passend für alle gängigen Autoguider
• Einfacher Anschluss an das Teleskop anstelle des Suchers, passend unter anderem an Skywatcher, TS-Optics, GSO, Vixen, Celestron ...

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

Perfect astrophotography: Whether you are an experienced astrophotographer or an enthusiastic beginner - with this Reducer Flattener you can take impressive pictures with ease.

A valuable addition for the large refractors from William Optics

• Image correction right to the edge
• Reduction factor 0.72x
• M92 threaded connection to the telescope
• Universal connection with M48 to camera or filter wheels etc.
• Very high quality workmanship

This Reducer Flattener is designed to take the optical performance of your telescope to a new level. With a reduction factor of X0.8 and an outstanding flattener function, it minimizes distortions and aberrations that can occur during observation and photography.

The 0.8x Flattener corrector from William Optics is optimized for full-frame format and suitable for all apos from 102mm aperture with large extensions.

• Connection thread on the telescope side M92x1 - adapters to M68 or M54 are optionally available
• The distance is precisely adjustable, so the corrector can be individually
• optimized to the refractor for best possible stars
• Triplet design with Ohara glass (Japan)
• M48x0.75 camera mount with possibility to screw in 2" filter

• Optimized for full-frame photography
• Variable adjustable distance to chip
• No focal length change
• M48 filter thread

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

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 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 corrector fits to the 2" receptacle of the focuser, it corrects the image field for astrophotography

• Suitable for refractor telescopes up to 102 mm aperture or smaller (ED, apo, achromat... )
• Connection telescope side 2" barrel with filter thread
• Connection camera side T2 thread
• Working distance from T2 thread to camera sensor is 55 mm
• No shortening factor, the focal length of the refractor is not changed

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

The corrector fits to the 2" receptacle of the focuser, it corrects the image field for astrophotography

• Suitable for refractor telescopes up to 102 mm aperture or smaller (ED, apo, achromat... )
• Connection telescope side 2" barrel with filter thread
• Connection camera side M48x0.75 thread
• Working distance from M48 thread to camera sensor is 55 mm
• No shortening factor, the focal length of the refractor is not changed

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

New ! Adjustable Flat73A for William Optics f/5 to f/7 telescopes

• Universally applicable for telescopes between f/5 and f/7
• Focusing travel is adjustable
• M63 thread on telescope side
• M48 thread on camera side
• Integrated M48 filter thread

New ! Adjustable Flat61 for William Optics ZS61 II Telescopes

• Compensates for field curvature and enables sharp images at the edges
• Camera can be mounted directly with M48 camera adapter
• Suitable for refractors from f/5 to f/7
• Distance to chip plane is variably adjustable