I have had this device for over a week, I tried it on my Celestron 8. I know I need to refocus my sight, but the scope was insanely blurry. Once I got it at a reasonable distance, the scope was severely blurry, even though the star was right in the center. I spent over a week trying to figure out how to fix the collimation but it didn't happen. I finally gave up, returned it and bought a Celestron model that worked without any problems. I may have stumbled upon a bad device, but since you have little to no support for the product, you're wasting more time than it's worth for a few extra bucks.
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