while I respect jim immensely, I find it hard to understand a noise floor issue with apex 205 ribbon mics (which I use extensively for, yes, violin and vocals, and also guitar cabs).
They have no noise floor that I can hear - if your preamp is noisy then yea with the high gain needed for ribbon mics you can have issues, but the mic itself has a terrific s/n ratio from my experience.
and to anyone curious about the apex 210, NEVER EVER EVER buy the apex 210 instead of the 205. it has the same ribbon setup in a larger, and therefore more impressive, mic body. but it has grill and body ringing issues and also has inferior HF probably due to the grill size or design.
the 205 is a cheaper and yet vastly less annoying mic to use with basically the same performance or better.