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Questar Field Ranger 7 (Zerodur, Broadband and Low Reflection coated)

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Product Description

Super Telephoto, Zerodur, Broadband and Low Reflection coated.  Manualrapid focus. Base package is equipped for video us and includes swivel coupling,C0mount adapter and extension tube set and case.

The Field Ranger 7 is based on the acclaimed Questar 7-inch design. The combination of unsurpassedoptics with a simple and rugged design contributes to making it the ideal high-magnification fieldsurveillance lens. The Field Ranger 7 is light, compact and well balanced. The EFL and aperture give it2 times the power and 4 times the light grasp of its smaller brother, the Field Ranger 3.5. Itsconfiguration makes it perfect for use with eyepieces, video, and night vision equipment.


Working Range: 16M (50ft) to infinity
Optical Resolution: 0.5 arc second
Clear Aperture: 178 mm (7 inches)
Effective focal Length (EFL) 2100 mm video/2400 mm with Image Erector
F-number: f/12 @ 2100mm EFL
Spectral Response: 0.35 – 1.5 micron (other on request)
Design Type: Maksutov Cassegrain Catadioptric
Corrector: BK7/MgFl2 178 mm CA (7 inches) diameter
Primary Mirror: Pyrex substrate, aluminum coated, SiO overcoat,193 mm (7.6 inches) diameter
Secondary Mirror: Aluminum coating on corrector, SiO overcoat,47 mm (1.85 inches) diameter
Baffling: Wire helix in central tube, precision threaded
Barrel: Aluminum heat-treated tube with precision machined andmatching lens cell
Rear Closure Plate: Aluminum; machined and matched to barrel
Central Tube: Centerless ground stainless steel and 6 inch .mount plate
Mirror mount/focusing tube: Precision linear roller bearingmatched to central tube, integrated with mirror mounting thimble
Focus Mechanism: 32 pitch ground stainless steel focus rod:Direct acting on mirror thi

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