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Hi Bob
I used a Kenko 1.4 ( pro model similar to Canon) with a Canon 300 F4L IS a lot for birding and I was very happy with it but never tried it for astro on the lens but did try it on a scope and it worked well.
Reviews on 1.4 vs 2x seem to favor the 1.4 , very little loss in quality.
Zane
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