I strongly doubt that you could use a loupe with the reflex viewer. It is used to compose the image, but has to be removed before you can use the loupe on the groundglass. I was a bit worried about how easyly and quickly that can be done, because if it is too fiddly, I won't use the reflex viewer. But since it is attached by some quick-lock device, there shouldn't be any problem.
You can of course use a loupe with the folding viewer.
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