William Optics SpaceCat 61 mm WIFD Petzval APO Refractor with UniGuide 32 mm Space-Grey; in Space Grey (limited edition bundle)

William Optics SpaceCat 61 WIFD 61/300 f/4.9 astrograph with UniGuide 32 mm guide scope (William Optics). The SpaceCat 61 WIFD astrograph uses a four-element Petzval design that requires no separate field flattener. WIFD internal focusing moves the optical elements inside the tube, while the rotator and sensor tilt adjuster help align the camera and orient the frame. The telescope is intended for wide-field astrophotography, including use with full-frame sensors. This Space Grey kit includes a colour-matched UniGuide 32 mm guide scope.

Key features

• four-element Petzval design with a flat image field
• internal WIFD focusing with a rack-and-pinion mechanism and 1:10 fine adjustment
• focusing mechanism compatible with an optional EAF motor
• camera angle rotator and sensor tilt adjuster
• carrying handle with a mini Vixen-style saddle for a finder or guide scope
• dual-sided Vixen / Arca-Swiss plate

Included items

• optical tube William Optics SpaceCat 61 WIFD with dew shield
• guide scope William Optics UniGuide 32 mm Space Grey, M-G32PB-TG
• lens cap with Bahtinov mask
• mounting ring with carrying handle
• dual-sided mounting plate, 210 mm
• rotator, sensor tilt adjuster and M54 / M48 camera adapter
• carrying case

Technical specifications

• optical design: Petzval, 4 elements
• objective diameter: 61 mm
• focal length: 300 mm
• focal ratio: f/4.9
• image circle diameter: 46 mm
• sensor formats: full frame, APS-C, Micro 4/3
• focusing system: WIFD, rack and pinion, 1:10 fine adjustment
• focusing travel: 0–42 mm
• camera connection with adapter: M48; without adapter: M54
• filter thread: M48 inside the camera adapter
• optional camera rings: Canon EF and RF, Nikon F and Z, Sony E, Pentax K, Micro 4/3, Fujifilm X
• tube length: 365 mm
• optical tube weight: 2.47 kg
• telescope weight with mounting components: 3.39 kg
• tube colour: Space Grey
• warranty: 24 months
• guide scope objective diameter: 32 mm
• guide scope focal length: 120 mm
• guide scope focal ratio: f/3.75
• guide scope weight alone: 0.23 kg

The Petzval optics and internal focusing provide a compact basis for an imaging setup for extended sky objects.

The photographs show the configuration and demonstration accessories. The supplied equipment is listed under “Included items”.