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Very nice setup with your SA Rick. I pushed mine well beyond its recommended limits before buying my EQ6-R and am keen to get back to using it again alongside my heavy mount. I was regularly able to get 5min exposures at 500mm.
I've had intermittent issues with tilt I suspect due to the ZWO EOS adapters - even with mounting the lenses to take the weight off the adapter. I couldnt justify the cost of a Geoptik locking device so I got a similar device off an Aussie eBay site that I expect will arrive today. I dont think it will be able to replace the thinner EOS-T2 EFW though as its a couple of mm too thick. Its the normal ZWO EOS-T2 I've had most trouble with anyway.
That Borg looks like an amazing weapon !!
I looked at most of the short, fast OTAs around the 350mm FL mark - most had some quirk that users were unhappy with. Others were just plain difficult to order into the country. I ended up buying a second hand Sigma 120-300mm F2.8 sports lens for similar money. It rates extremely well for sharpness out to the corners even wide open, at almost all focal lengths. I was taking a big punt as I couldnt find anyone else using one for Astro. So far I'm very impressed - and of course it makes a good wildlife / sports zoom lens during the day :-)
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