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I have read that the (Bintel) 0.8x Orion reducer also is a corrector. I have one. Works fine in the ED100. Very minor distortion only at the extreme corners. Also works great with the SW 120mm F5 refractor. What it doesn't like is my Kson 80mm F5.5 refractor. Heaps of edge distortion. Why it works with the 120mm F5 but not an 80mm F5.5 I don't know. Maybe it doesn't like FL less than 600mm? I should try it on the Meade SN102 F7.8 to see how it goes at around 800mm.
Unfortunately there's no way of knowing how well it would correct on the ED120 without trying it.
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