First-class precision instruments based on Klevzov's original advanced optical system design, for the advanced amateur astronomer who desires high resolution and excellent light passing power in a highly portable telescope. The Klevzov-Cassegrain non-aspherical system presents a radical new form of catadioptric telescope that combines the compactness of the short cathadioptric-Cassegrain with similar enviable high resolution image quality and contrast of modern Maksutov designs. Klevsov's revolutionary catadioptric design employs a sub-aperture meniscus correcting lens, combined with a Mangin mirror-lens secondary. Their fast focal ratios, flat field and excellent correction of coma, spherical aberration and astigmatism (14 micron star images at a distance of 5,5 mm from the optical axis!!) makes these superb instruments for astrophotography, as well as for the observation of planets and deep-sky objects, with a photographical size of 10 - 15 arc minuites.
Download collimation instruction TAL 250K (pdf)
Jupiter
TAL 250 K witht 2,5x TeleVue Powermate (5325 mm Focal range)
DBK21 mit Astronomik-Filters
each 20 % from 1000 images with Giotto addied and sharpened
with Fitswork to RGB
(R. Schalow)
TAL 250K NGC891 6x4min.
(R. Schalow)
Full size here 
TAL 250 K Bubble-10x4min-Atik16HR
(R. Schalow)
Full size here
| Tabellary Data: |
| Tecnical Details |
TAL 250 K |
| Aperture |
Mirror 250mm |
| Tube length |
w/o Focusser 505 mm |
| Tube diameter |
Outside 275 mm |
| Focus length |
2125 mm |
| Focal ratio |
f/ 8,5 |
| Max. fotogr. Field |
40 min |
| Max. vis. Field |
33 min |
| Focusser |
2" with 1,25" Adaptor
|
| Finder |
8 x 50 Deluxe / 8°
|
Obstruction
|
90 mm
|
| Weight OTA |
13,5 kg |
Accessoreis:
- Finder 8 x 50 Deluxe
- Losmandy 3" mount dove tail or Vixen/Synta
