Sky Rover Optics 68SAW 68/265 f/3.9 Specialist Astrograph Widefield is a very fast apochromatic astrograph designed for wide-field astrophotography. With a 68 mm aperture, 265 mm focal length, and f/3.9 focal ratio, this model offers a wide field of view, high imaging efficiency, and a compact, stable mechanical structure well suited to portable use in the field. The 68SAW uses an integrated optical design with a built-in flat field, providing good image correction without the need for a separate flattener.
• wide-field astrograph with a 68 mm aperture, 265 mm focal length, and f/3.9 focal ratio
• 7-element apochromatic optical design of the air-spaced septuplet APO type
• integrated optical system with a 3-element front group and a 4-element rear group
• use of three SD glass elements
• built-in flat field - no separate flattener required
• 44 mm image circle
• very good chromatic aberration correction at a focal ratio below f/4 according to the manufacturer's declaration
• minimal vignetting at the edge of the full frame according to the manufacturer's declaration
• design optimized as a complete system - without a separate focal reducer
• shorter working backfocus intended to improve stability and vibration resistance according to the manufacturer's design assumptions
• adjustable 55 mm backfocus, making it easier to use astrophotography accessories
• 2.5" Crayford R&P focuser with microfocuser and 29 mm effective travel
• M48 × 0.75 and M54 × 0.75 connection threads
• compatible with accessories in the Vixen and Arca-Swiss standards
• precision-machined CNC mechanics with internal matte-finish baffles
• designed for astrophotography - the manufacturer does not recommend use with visual accessories such as a diagonal
• the front and rear optical groups are factory matched and should not be separated
• Sky Rover Optics 68SAW optical tube
• 2.5" Crayford R&P focuser with microfocuser
• tube ring with handle
• mounting foot / rail compatible with Vixen and Arca-Swiss
• soft carrying bag
• manufacturer: Sky Rover Optics
• model: 68SAW
• SKU: 99727
• type: wide-field APO astrograph
• aperture: 68 mm
• focal length: 265 mm
• focal ratio: f/3.9
• image circle: 44 mm
• optical design: 7-element, air-spaced septuplet APO
• front group: 3-element
• rear group: 4-element
• optical glass: 3 SD elements
• built-in flat field: yes
• focuser: 2.5" Crayford R&P, dual-speed
• effective focuser travel: 29 mm
• interface threads: M54 × 0.75 and M48 × 0.75
• backfocus: 55 mm, adjustable
• accessory compatibility: Vixen / Arca-Swiss
• length with dewshield retracted and focuser retracted: 274 mm
• length with dewshield extended and focuser extended: 350 mm
• net weight: 2.3 kg
• gross weight: 2.9 kg
• packaging: soft bag and carton
