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TS-Optics CF-APO 90mm f/6 FPL55 Triplet APO refractor with certificate

Apochromatic refractor with 90mm aperture and 540mm focal length offers the highest optical and mechanical performance for astrophotography and amateur astronomy

♦ Opening 90mm

♦ Focal length 540mm / focal ratio f/6

♦ First class color correction with FPL55 triple lens

♦ Indoor screens

♦ High quality metal tube with CNC tube rings

♦ Retractable spray shield

♦ 2.5" RAP focuser - ball bearing with connection thread M63x1 for screw adaptations

♦ Micro reduction and 360° rotation of the focuser

♦ Each TS-Optics CF-APO is supplied with a test certificate and serial number

♦ Heavy-duty carrying case, carrying handle and dovetail bar included

♦ 0.8x corrector for astrophotography available - extra calculated for this telescope

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receive it in usually 7 to 9 working days

TS CF-APO 90/600 mm FPL55 triplet apochromatic

The fast, colorless 90mm Apo is equally suited to visual observing and astrophotography. Thanks to the FPL55 APO element (comparable to FPL53), the image is first class and in practice can no longer be distinguished from the world famous Russian LZOS lenses.

The compact Apo is only slightly larger than the Apos with an 80mm aperture, but offers significantly better performance in the sky. This refractor is an ideal travel telescope thanks to the retractable dew cap and a transport length of a good 400mm.

The 90mm Apos lens:

The triple lens with 90mm aperture and 540mm focal length meets the criteria for a full apophoto. Even when enlarged by a factor of 300, the image is free from annoying color errors. Even bright stars show up in astrophotos without disturbing blue fringes.

The APO element consists of FPL55. Another special glass supports color correction. The air-gapped triple lens is fully adjustable. Each glass-air optical surface is multi-coated. The lens has an adjustable mount with temperature compensation.

The 2.5" rack and pinion photographic focuser:

The 2.5" CNC focuser is optimized for photography and can handle a load of up to 6kg. The focuser tube is adjusted via a pinion gear. We also offer motorized focus for the focuser. An internal M63x1 thread is available for adaptations. The excerpt also offers 360° rotation to choose the correct image section.

Astrophotography with the apo

A corrector is required to achieve an optimal image in the field. The corrector is screwed directly into the M63 thread of the apos. We recommend two correctors, both of which are suitable for cameras up to full frame.

♦ TSCFRED90 - Corrector 0.8x

The corrector is calculated extra for this apo. It reduces the focal length to 432mm and improves the aperture ratio to f/4.8.

♦ TSFLAT25del - Checker 1.0x

The concealer provides maximum illumination. Does not change the focal length and aperture ratio.


Aperture: 90 mm
Focal length: 540 mm
Focal ratio: f/6
Objective: Multicoated APO triplet lens - FPL55
Tube: CNC metal tube
Limiting magnitude: 12.3 mag
Resolution: 1.29"
Weight tube alone: 3.54 kg
Weight with tube rings, dovetail bar and handle: 4.6 kg
Dew shield: retractable - can be fixed with one screw
Focuser: 2.5" CNC focuser, 95 mm travel
Connections on the eyepiece side: 2", 1.25" and M63x1 female thread
Working distance: 148 mm from the 2" connection when the focuser tube is retracted
Tube length (dew cap retracted): 445 mm
Tube diameter: 105 mm
Dew cap diameter: 121 mm
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