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The Explore Scientific Coma corrector is in a class of its own: it is fully functional for visual use and only extends the focal length by 6%.
The Explore Scientific Coma corrector comes complete with a helical fine focuser - so you have a complete set: T2 adapter, M48 adapter and helical focuser for visual observations.
The coma corrector has a visual polystrehl value of 0.98 at f/4 and 0.96 at f/3! It can permanently stay in the telescope - making not only Jupiter but also its moons crystal clear.
- The image diameter is 30mm - a larger diameter makes no sense for 2” and fast optics.
- The corrector tube length is approx. 85mm.
To use the HR Coma corrector visually, there needs to be an adjustment range of 32mm on the focuser available when the focus is on the same level as the drawtube. This is not critical for photographic use - the HR Coma corrector places the focus around 35mm further out.
If the camera can be focused without a corrector, there will be no problem focusing it with the corrector.
