TS-Optics 70 mm f/5 Quadruplet Flatfield APO is a professional astrograph whose design has been refined down to the smallest details for use in astrophotography.

The optics of this refractor consist of four lenses mounted in two groups. Thanks to the use of carefully selected types of optical glass and a low-dispersion lens made of FPL-53 glass, excellent correction of chromatic aberrations was achieved, which allows for obtaining fully detailed images with faithfully reproduced colors both in the center and at the edges of the field of view.

The instrument is equipped with a solid, three-inch Rack & Pinion extractor with a gear ratio of 1:10 and a maximum permissible load of up to 6 kg. The extractor is integrated with a rotator with a 360° rotation range, allowing for perfect framing of photographed objects, and thanks to the additional M48 thread in it, easy installation of two-inch astronomical filters is possible.

The most important features of the TS-Optics 70 mm f/5 Quadruplet Flatfield APO astrograph

• four-element optics with f/5 light intensity and 350 mm focal length
• excellent correction of chromatic aberration thanks to the use of a low-dispersion lens made of FPL-53 glass
• three-inch extractor allowing the connection of large digital cameras or astronomical cameras without the risk of loss of linearity
• possibility of installing filters with a diameter of 2"
• solid mounting clamps made using CNC technology

Technical parameters

• optical design: refractor
• lens system: ED quadruplet with air break
• low dispersion lens material: FPL-53 glass
• Front lens diameter (aperture): 70 mm
• focal length: 350 mm
• aperture: f/5
• back focus (from external M48 thread): 70 mm
• back focus (from internal M54 thread): 76 mm
• extractor diameter: 3"
• lift type: rack & pinion, dual speed with rotator
• focuser adjustment range: 30 mm
• maximum load of the lift: 6 kg
• thread at the end of the extension: M54x0.75 / M48x0.75
• possibility of installing filters: yes, 2" for M48 thread
• Diameter of the full illumination disc: 45 mm
• mounting bracket: Vixen foot
• Deflector diameter: 103 mm
• transport length: 325 mm
• weight: 3 kg

Set elements

• TS-Optics 70 mm f/5 Quadruplet Flatfield APO astrograph
• mounting clamps
• Vixen footer

Guarantee

24 months