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TS Optics 8" F/4 Imaging Newtonian - from £449.00
This is a development of the original GSO F4 OTA by TS Optics. The internal diameter of the tube has been increased, a 70mm secondary is standard, a solid Monorail focuser replaces the basic Crayford and enhanced coatings have been applied to the optical surfaces. A new benchmark has been set for performance!
GSO are famous for the quality of their optics which are, in our opinion, better than the Chinese standard. This makes the TS Optics 200 F/4 Newtonian not only excellent for imaging and observing deep sky objects, but for observing the moon and planets too.
With a low focal ratio of f/4 exposure times are much shorter than with higher focal ratios (About 2/3rds those of an f/5 Newtonian and less than 1/2 those of an F6 APO refractor). This makes the 8" F4 perfectly suited for deep sky imaging in our climate, where clear skies can't be relied upon. It's particularly suitable for one shot colour cameras and narrowband imaging with Mono cameras.
With the addition of the Baader MPCC the OTA becomes a powerful 8" F4 astrograph, providing pin sharp stars across the full FOV of a 35mm format CCD. Try to find an APO with better imaging performance that doesn't cost many times more than this OTA!
For collimation we recommend the use of a laser collimator, which makes the process quick and easy, we've found these units retain collimation well. Please note that all tube assemblies supplied by "Modern Astronomy" are carefully selected to have sufficient back focus for a modern DSLR.
What's Included:
- 8" F4 Newtonian OTA
- 8x50 finder + bracket
- Tube rings and Vixen style dovetail
- TS 2" Monorail focuser with integrated 1:10 dual speed microfocuser and 1.25" adapter
- 35mm focuser extension tube -for visual use
- Mirror cooling fan and dust cover.
- 70mm Secondary