The Sky-Watacher Flattener is an optically-matched M48-fitting doublet field flattener for Sky-Watcher's Esprit 100 ED PRO triplet refractor.
The M48 fitting provides a large clear aperture to reduce halation and a precision thread ensures the triplet and doublet lens groups are precisely aligned on the optical axis perpendicular to the image.
When used with the field flattener the Esprit-100's imaging circle is 40mm.
The flattener or field flattener is a lens that evens out the field, as this is slightly curved by the primary optics. This curvature causes stars that are imaged at the edge of the field of view to be less sharp. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. The flattener is installed between the telescope and the camera.
Notes:
1-When fitting a DSLR camera you need only a M48 Ring to suit your Canon or Nikon camera. No spacers are required.
2-The spacing for dedicated CCD imaging cameras is 55 mm from mating surface (69.8 mm from centre of rear element).
3-The rear thread is M48. When using T-threaded accessories you will need a FLO M48-T adapter.
For more information about, Skywatcher Esprit 100ED M48 Field Flattener website.
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