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TS-Optics 90 mm f/5 Quintuplet Flatfield APO Refractor Telescope


The apochromatic 5-element refractor with 90 mm aperture and powerful f/5 is ideal for astrophotography with powerful cameras.

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En Bref:

  • Aperture 90 mm - focal length 450 mm - focal ratio f/5
  • Air-spaced FPL53 triplet objective - no relevant chromatic aberration
  • High-quality 2-element ED corrector, permanently installed in the tube
  • 100% illuminated and fully corrected image field to full format
  • Freedom from reflexes due to optimized lens positions and best possible coating of the lenses
  • High-quality 3.2" R&P focuser with M63x1 and M48x0.75 connections on the camera side
  • Connection thread for 2" nebula filter is integrated in the focuser
  • High-quality design with CNC tube rings and EQ5 style dovetail bar
  • Multi-function handle - can also be used as a base for guiding scopes or piggyback camera mounts

TS 90 mm f/5 Quintuplet Apo with full image field correction beyond full frame size format

The 90 mm f/5 quintuplett has been developed for astrophotography with large, but also high-resolution sensors as used in modern astro cameras and system cameras. The image is free of annoying chromatic aberrations and reflections with very good sharpness over the entire image field.

With about 5.2 kg and only 36 cm transport length, the telescope is very compact and even suitable for air travel. We recommend a mount of the EQ5 class or an even more stable one as base.

Other features and benefits of the 90 mm f/5 quintuplet:

  • The corrector is fixed in the tube, as soon as you have focused the camera, you are automatically at the right distance for an optimal field correction.
  • The 3.7" focuser is supplied with an extension from M63x1 to M48x0.75 with a screw-in option for 2" filters.
  • Tilting mechanism with push and pull screws to compensate for a misalignment of the camera sensor for perfect edge stars.
  • Every 90 mm quintuplet apo is optically and mechanically checked before dispatch at Teleskop-Service.


  • Optical design:    5-element APO refractor with field flattening
  • Lens:    3-element FPL53 triplet with air gap
  • Image field:    Fully illuminated and corrected image field with 48 mm diameter
  • Focuser:    3,2" R&P focuser with 360° rotation and tilting device
  • Connection thread:    M63x1 internal thread and M48x0.75 external thread
  • Tube length:    358 mm with retracted dew shield
  • Dew shield:    can be extended (80 mm)
  • Weight:    5.3 kg with tube rings, dovetail bar and carrying handle 5,3 kg avec anneaux tubulaires, barre en queue d'aronde et poignée de transport
Product Details

Data sheet

Rapport F/D
Porte Oculaire
Filetage M48

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APO 72mm F5.6 FRA400 with integrated corrector- ASKAR

TS-Optics 90 mm f/5 Quintuplet Flatfield APO Refractor Telescope

The apochromatic 5-element refractor with 90 mm aperture and powerful f/5 is ideal for astrophotography with powerful cameras.

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Brand: ASKAR - Sharpstar

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