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Re being unable to see the Tarantula through the scope...
When I look through the viewfinder of my DSLR through my 200/1000mm Newt, I can barely see anything. When I take the camera out and use, say, a 25mm eyepiece, I can see vastly more. The camera's viewfinder is nowhere near as bright as an eyepiece - only bright targets like clusters or planets (or the occasional nearby nebula like Orion) are visible through it. It's a pain having to refocus etc, but it's either that or take a bunch of high-ISO exposures and guess which way to slew the mount to centre the target.
You probably already know that, but just thought it was worth making sure!
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