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I have two 800mm side by side attachments to a vixen dovetail, a 3.5 kg refractor with lrgb astro camera and guider and a 3.5kg Nikon Ed 800 lense with dslr. Seems to work , surprisingly , guided to 4min on the HeQ5 and I have combined the images just for interest. I think I need to add an aluminium plate 6-8 mm to stiffen the top of the vixen bar but if it is not pushed it seems fine. The torsion vibration on the bar could be an issue with three of those. I can post an image if you are interested once the painters have left my house. I would be interested to hear how you would combine images.
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