" TS 65mm f/6.5 Quadruplet Astrograph - 65mm aperture / 420mm focal length
4 element APO telescope with perfect field correction for astro photography - 2" RP focuser - FPL53 glass
The TS Quadruplet Astrograph 65mm f/6.5 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 Q advantages:
-- fully corrected triplet lens group for colour-free imaging
-- integrated field flattener (4th lens) for a corrected fiels up to full-size sensors
-- optimized flattener position inside the tube for best effect
-- optimized baffles without vignetting
-- 2" dual speed focuser for high loads - no slipping, no shifting
-- 360° rotation possibilitiy for ideal framing
-- CNC tube rings and GP-style prism rail with foto thread
-- finder shoe (Vixen/Celesstron/Skywatcher compatible)
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 "
Edited by johninderby, 02 March 2011 - 11:32 AM.