I have never had to use a loupe with a viewer. The viewer has a loupe built in.
Now, maybe my eyes are better than someone else's, but I do wear glasses and my eyes are 61 years old.
I have used loupes when a viewfinder was not available, but prefer the convenience of a right angle viewer (RAV) when available .
Currently I use RAVs with my Linhof MT, Sinar, and a Hasselblad RAV with my ALPA medium format digital & film cameras.
They feel natural to me whereas a darkcloth does not. If it makes me work faster, I generally use it.
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