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I've had the opportunity to try the 26mm QX in daylight terrestrial applications in several scopes from f/11 down to f/7. The image seemed sharp to the edge of field in these tests. One customer who purchased this eyepiece based upon a daylight impression in a f/7 TV-85 refractor promptly returned the eyepiece after using it in his f/5 refractor. Intuition suggests that thse eyepieces will work just fine in a typical f/10 SCT, but approach with caution when using scopes faster than f/7.
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