TS-Optics 70 mm f/5 Quadruplet APO with FPL53 Objective

The TS 70 mm quadruplet is an ideal traveling telescope for astrophotography. The apochromat offers a fully illuminated and corrected field of 45 mm diameter, so it is also suitable for cameras with full frame sensors. The FPL53 objective corrects the chromatic aberration. The image is free of chromatic aberration on axis and in the field.

• Aperture 70 mm / focal length 350 mm
• Focal ratio f/5
• Fully illuminated and corrected image circle with 45 mm diameter - also suitable for full frame
• 4-element quadruplet design with FPL53 triplet lens for an image without chromatic aberration
• The corrector element is permanently installed in the tube
• 3" rack and pinion focuser with 1:10 dual speed - suitable for accessories up to 6 kg
• Camera connection via M48x0.75 external thread or M54x0.75 internal thread
• 2" filter thread is integrated in the transition adapter to M48 for the connection of all standard 2" filters
• A 360° rotation for the correct image section is built in
• The focuser offers a tilt option
• Working distance is 70 mm from the M48 thread and 76 mm from the M54 internal thread - draw tube position inside
• Focuser travel - 30 mm
• Multifunctional carrying handle with photo thread
• Finder shoe for finders and Mini Guidescope

Technical Specifications

• Aperture: 70 mm
• Focal ratio: f/5
• Focal length: 350 mm
• Optics: 4-element design in two groups
• Lens: Triplet FPL53 lens with air gap
• Correction: Fluoride glass corrector installed in the tube
• Photographic field: 45 mm diameter fully corrected and illuminated
• Focuser: 3" rack and pinion with dovetail ring and M48 connection - additional thread on the focuser M54x0.75 internal thread
• Focuser travel: 30 mm
• Weight: 3 kg
• Length: 325 mm with retracted dew shield
• Outside diameter of the dew shield: 103 mm
• Working distance: Maximum possible working distance from the M48 external thread 70 mm - from the M54x0.75 internal thread 76 mm