I noticed something odd with my acoustic violin.  I record my practices, so I can review then later in the day and hear how I am playing and what I should maybe be working a bit more on.  I also walk around while practising/playing, rather than standing or sitting in one place.  Since I am generally the only person that gets to hear those recordings, keeping a consistent distance from the mic to keep levels steady isn't really a concern.

I hadn't been recording practices for almost a month because with the holidays and kids home from school and visitors and the household being busier than usual, it wasn't as practical to do so.  Since then, strings have been changed, tailpiece was changed, thee violin spent more time in "vibration treatment" and I've been puttering with getting the afterlength "perfect" so far as being tuned.  So there have been some things that could possibly change the sound output.

What I noticed that was weird is that amplitude of the recorded wave was not noticeably different when I was 20 ft away from the mic than it was when I was within 2 ft.  I thought maybe I was trying to unconsciously compensate for distance from the mic by playing a bit harder, so I went a bit further from the mic.  At about 30 ft, it is definitely a bit lower amplitude, no matter how hard I try to play, but up to 20 ft or so, it is surprisingly consistent.

It doesn't sound the same at 2 ft and 20 ft.  The further back one gets, the less string noise one heard, for example, and minor nicks and other boo-boos are much less noticeable.  Timbre is a bit different, since distance takes some of the harshness off the sound, mellows it a bit.  

So far as recording, mic distance may take more experimentation than I thought to get good recordings of acoustic violin.