I use a 16mm T5 Nagler a lot in mono and bino mode. I don't find the eye relief to be a problem at all but I also tend to observe with eye cups folded down on all my eyepieces; just prefer it that way and as my viewing surrounds are quite dark I can do without the eye guard.
Note the volcano top form factor of the 16NT5 does allow you to get your eye closer.
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