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PHOTON 8" F5 Newtonian reflector telescope for observation and astrophotography - optical tube assembly from Teleskop Service
♦ Aperture 200 mm (8") / focal length 1000 mm / photographic speed f/5
♦ High quality parabolic primary mirror with 94% enhanced reflectivity coatings for a brighter and contrastier image
♦ Largely dimensioned secondary mirror with 63 mm diameter (minor axis) - very good illuminated field for astrophotography
♦ Primary mirror cell and secondary mirror holder completely made of metal - not plastic - fully adjustable (image of the secondary mirror holder at left)
♦ Precise 2" Crayford focuser with 1:10 dual speed transmission for exact focusing - already included
♦ Primary mirror cooling fan for less cooling time
♦ Rigid steel tube instead of a wobbly aluminium tube - better adjustment stability
This telescope is a true all-rounder and ranks among the best in this range. Through the versatile focal ratio of f/5, the Newtonian offers best prerequisites for lunar and planetary observations. The optimized secondary mirror is designed for deep-sky observations as well as for astrophotography.
♦ Moderate focal ratio for short exposure times for astrophotography.
♦ Very high sharpness on moon and planets
♦ Secondary mirror provides good illumination, for example for DSLR cameras
♦ Large backfocus allows using popular coma correctors and cameras
♦ High-quality primary mirror of optical BK7 glass with enhanced 94% reflectivity coating provides a bright, clear image.
♦ Stable 2" Crayford focuser with 10:1 dual speed and 1.25" reduction adapter
♦ Motor focus can be retrofitted at any time
♦ Quicker cooling down, quicker observing, quicker photographing through fan for the primary mirror
♦ Steel tube and metal mirror cells for optimal adjustment stability
This Newtonian shows its full potential at observation and astrophotography due to a high-quality primary mirror made of optical BK7 glass, free from internal stress. The parabolic mirror has a 94% reflectivity coating, thus offering a brighter and contrastier image. You can instantaneously notice the difference to a standard coating.
Due to the focal ratio of f/5, this Newtonian belongs to the all-round telescopes for astrophotography and observing.
Details:
| Aperture: | 200 mm (8") |
| Focal length: | 1000 mm |
| Focal ratio: | f/5 |
| Primary mirror: | Parabolic primary mirror with 94% enhanced reflectivity coatings and quartz layer |
| Secondary mirror: | 63 mm diameter (minor axis) with 94% enhanced reflectivity coatings and quartz layer |
| Field illumination: | 28 mm diam. (100%) - ideal for APS-C format sensors with matching coma corrector |
| Focuser: | 2" Crayford focuser with 1/10 dual speed transmission |
| Tube weight: | 9 kg with rings and finder |
| Dimensions of tube: | length 900 mm, diameter 230 mm |
| Size package: | 31 cm x 40 cm x 100 cm |
| Weight: | approx 12.5 kg |
Scope of delivery:
♦ Photon 200mm f/5 Newtonian with tube rings and 8x50 finder and 2" Crayfor focuser 1:10
♦ 2" extension tube 35 mm for easy reaching of the focus when observing
♦ 12 V main mirror fan
♦ GP-level dovetail
Please visit our Onlineshop, here you can find more informations
For this please visit Telescope-Express com, then have a look by telescopes
Your Telescope-Service Team