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I've got this telescope and I'm loving it. Just one drawback relating to the focuser... As you know, the focuser it comes with is a helical type. I want to take photos of Jupiter and Saturn which are in the sky at the moment. To do that, I need to add barlows and a mobile phone holder (plus the phone itself). All these things together add weight and the whole assembly has to be rotated to get focus. It's very cumbersome to rotate it with the phone attached and I'm scared the focuser will at the very least, get accidentally bent out of shape. Is it possible to replace the helical focuser with a more sturdy rack and pinion focuser? If yes, which one do I get?