This is a converter to mount cameras on a microphone stand. It was intended for my Zoom H4 sound recorder, which has - strangely enough - a camera thread on its mount. Since there are usually enough microphone stands available when you want to make an audio recording, and not as much camera tripods one of my first designs has been this converter.
There might be some other similar converters available on Thingiverse, but this one is fully printable. Though it might be wise to not mount a $1000 SLR camera..
I've made a new v3 version that might have a better threading fit; at least it does on my printer. And per commented request I've added a version with the (less common) 5/8" thread.
Make sure your layer delay time is set; the small camera thread needs time to set before the next layer is printed!