Lunette APO quadruplet 65/420
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TS Imaging Star 65mm f/6.5 Quadruplet Astrograph - 65 mm aperture / 420 mm focal length
... 4-element Apo telescope with field correction for astro photography - 2" RP focuser - FPL 53 glass
The TS Quadruplet Astrograph 65mm f/6.5 of the TS Imaging Star Line offers a highly corrected focal plane for astro photography and is therefore an interesting alternative e.g. to the Takahashi FS-60 or the Pentax 75 SDHF. It is fine crafted and optimal for mobile deep-sky imaging featuring a minimum mechanical length of 340 mm (with retracted dew cap). Image quality on- and off axis is perfect and the very low chromatic abberation allows a visual magnification range up to 150x.
TS APO 65 Quadruplet advantages:
2" Rack and Pinion focuser:
This focuser combines the advantages of a rack & pinion focuser with an improved bearing system. A Crayford design has its optimal stiffness only when the drive shaft is pressed firmly against the rail - this causes bucky operation. The fine machined cograil allows smooth focusing even under heavy loads up to 3 kg.
The focuser also features a 2" and 1.25" receptacle with brass compression rings. 2" accessory is locked by two thumbscrews - this prevents tilting.
The 65mm Quadruplet's optical system - four lenses in two groups:
For this lens system FPL-53 glass is used for optimal colour correction. Stars are free of colour fringes and halos which may occur with camera-side corrector applications.
The fixed internal ED flattener causes an optimal image correction for sensor with a diagonal up to 44 mm. With a separate lens brought into the focuser, this can hardly be reached. This highly corrected system is additionally supported by a adequate baffling system.