Corrector, Focal Reducer 

There are 4 products.
GSO 2" Coma Corrector for fast Newtonian Telescopes Reduce coma and field curvature For Both Visual And Imaging Usage Design optimized for use at f/4.5 Weight: 500g
This combination focal reducer and field corrector lens accessory works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain telescopes. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. The Reducer/Corrector is f/6.3 for C5, C6, C8, C9ΒΌ and C11 telescopes and f/7 for the C14...
$ 299
Out of stock
Used for Long Exposure Astrophotography Reduces Focal Length from f/9 to f/6.4 Fits VC200L Reflector Telescope Decreases Exposure Time
William Optics' New Adjustable Field Flattener 68III (3rd Generation)
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