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The Shelyak LISA is a low-resolution, high-luminosity slit spectrograph optimized for faint celestial objects including variable stars, comets, novae, supernovae, and galaxies in the visible spectrum (400-700 nm). Featuring an f/5 aperture with resolving power of approximately R~600-1000, the LISA combines exceptional light-gathering capability with user-friendly operation through interchangeable slits that allow observers to balance spectral resolution with brightness. This precision instrument is specifically designed for direct attachment to prime focus, includes a mirror slit for accurate target positioning, and supports optional autoguiding via a separate guidance camera for extended exposures of faint astronomical objects.
| Collimator Focal Length | 130 mm |
| Spectral Range | 400 |
| Custom Objective Focal Length | 88 mm |
| Backfocus Distance | 41 mm |
| Guide Camera Backfocus | 17.5 mm |
| Focal ratio | f/5 |
| Weight | 1.4 lb |
| Resolving Power | 600″ |
| Telescope Interface | M42x0.75 mm thread |
| Collimator Focal Ratio | f/5 |
| Guide Camera Interface | C-mount |
| Slit Widths | 15 μm |
| Mounting Options | 2-inch ring adapter, T2 or T-mount |
| Custom Objective Focal Ratio | f/2.4 |