TS-Optics CF-APO 90 mm f/6 FPL55 Triplet APO Refractor with Certificate

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

♦ Aperture 90 mm

♦ Focal length 540 mm / focal ratio f/6

♦ First-class color correction with FPL55 triplet lens

♦ Internal baffles

♦ High quality metal tube with CNC tube rings

♦ Retractable dew shield - Transport length only 445 mm

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

♦ Micro-reduction and 360° rotation of the focuser

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

♦ Sturdy transport case, carrying handle and dovetail bar included in delivery

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



 

TS CF-APO 90/540 mm FPL55 Triplet Apochromat

The 90 mm apo is pure in colour and bright in light and is equally suitable for visual observation and astrophotography. Thanks to the FPL55 APO element (comparable to FPL53) the image is first-class and in practice cannot be distinguished from the world-famous LZOS lenses from Russia.

The compact apo is only slightly larger than apos with 80 mm aperture, but offers a much better performance in the sky. This refractor is an ideal traveling telescope due to the retractable dew cap and a transport length of a good 400 mm.
 

The objective of the 90 mm apo:

The triplet lens with 90 mm aperture and 540 mm focal length fulfils the criteria of a full apo. Even at magnifications of 300x, the image is free of annoying chromatic aberrations. Even bright stars are shown on astrophotos without disturbing blue fringes.

The APO element consists of FPL55. A further special glass supports chromatic correction. The air-spaced triplet objective is fully adjustable. Each optical glass-air surface is multi-coated. The objective is in a temperature compensated, adjustable cell.
 

The photographic 2.5" rack&pinion focuser:

The 2.5" CNC focuser is optimized for photography and can handle a load of up to 6 kg. The adjustment of the draw tube is done by gear drive. We also offer motorized focusing for the focuser. An M63x1 internal thread is available for screwed adaptations. The focuser also offers 360° rotation for selecting the correct image section.
 

Astrophotography with the apochromat

To achieve the optimal imaging in the field, a corrector is needed. The corrector is screwed directly to the M63 thread of the apo. We recommend two correctors, both are suitable for cameras up to full format. The working distance from the M48 thread to the sensor is 5 5mm.

♦ TSCFRED90 - 0.8x corrector
The corrector is specially calculated for this APO. It reduces the focal length to 432 mm and improves the focal ratio to f/4.8.

♦ TSFLAT25del - 1.0x corrector
The corrector provides maximum illumination. It does not change the focal length and focal ratio. The working distance from the M48 thread to the sensor is 55 mm.

 

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
Length:	445 mm with de2 cap retracted - 510 mm with dew cap extended
Rear tube thread:	M102x1, female

In the box:
♦ TS 90/540 mm Apochromat metal tube
♦ CNC tube rings
♦ Carrying handle
♦ Vixen style dovetail bar
♦ Transport case