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I have a no-name branded version of the Orion FF sourced from the UK for approx $100. This FF is available under about 4 or 5 different brands.
It works but the corners of an 18mpix APS-c sized sensor still show some coma on an SV70ED f6 scope. It may not be as apparent on a lower resolution sensor, yet to try it with the 10mpix 40D.
This might be corrected with some tweaking of the spacing, not sure tho as I haven't tried.
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