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Based on a novel optical design by Klevtsov, the versatile TAL-150K is the ideal instrument for the advanced amateur astronomer who desires high resolution and excellent light-gathering power (limiting visual magnitude 13) in a highly portable telescope.
The TAL-150K provides an aperture of 150mm and focal length of 1550mm in a very compact tube length of only 425mm (17 inches). Klevtsov's revolutionary catadioptric design employs a sub-aperture meniscus correcting lens (like the familiar Maksutov) combined with a Mangin mirror-lens secondary. Its fast focal ratio of f/10.3, flat field, and excellent correction of coma, spherical aberration, and astigmatism (14 micron star images at a distance of 10mm from the optical axis!) make the TAL-150K a superb instrument for astrophotography, far surpassing conventional Schmidt-Cassegrain and Ritchey-Chretien systems.
The telescope is supplied with an 6x30mm finder with a 8 degree field of view, an equatorial mount with motor drive in Right Ascension and manual slow-motion in Declination, two eyepieces of 25mm and 10mm focal length, and a 2x Barlow lens. At the customer's request, the mounting can be supplied either on a rigid metal pedestal or a hardwood tripod. A fitted wood carrying case is also included.
To comfortably observe objects near the zenith, a diagonal mirror which diverts the light path by 90 degrees is also supplied, as well as an adaptor for 35mm SLR cameras.
|Focal length, mm||1550|
|Limiting visual magnitude||13m|
|Magnification, min||60x (f=25mm)|
|Magnification, max||320x (f=10m & Barlow 2x)|
|Angular photographic field||40' (23.3mm)|
|Angular visual field, max||41' (f=25mm)|
|Angular visual field, min||6.3' (f=10m & Barlow 2x)|
|Central obstruction area, %||13|
|Length of tube, mm||425|
|Range of slow-motion control on the axes within||±180°|
|Latitude range of mounting||0...70°|
|Magnification of the finderscope||6x|
|Angular field of finderscope||8°|
|Voltage of the supplying mains, V||220 (110) ±10%|
|Current frequency, Hz||50 (60)|
|Output voltage of the supply unit, V||12|
|Weight of the telescope, kg||23|
|Weight of the telescope packed, kg||30|
Optical train of telescope.
Primary mirror part.
Corrector. 1 - cell; 2 - Mangin mirror-lens secondary; 3 - meniscus lens; 4 - padded ring; 5 - spring; 6 - threaded retaining ring; 7 - cover plug.