You need to use an external dynamic or self-powered condenser mic. What's your intended usage?

I see, Thanks Boswell. I usually collect sound with Sony handheld (PCM-D50) with built-in mic, to use in my computer software.
The Nagra III manual says: "The microphone should have an impedance of 50 or 200 ohms. This input socket on the Nagra is Cannon
type XLR 3-42." I wonder compatible microphones are easy to come by.

I think that is a standard XLR microphone input, so any professional dynamic or self-powered mic with an XLR cable should work. Other than saying you want to "collect sound", you don't say what the application is, but if this is reporting or news gathering, you could try the Beyerdynamic M58, although there are many mics that would fulfil this task.

Boswell, post: 373397 wrote: I think that is a standard XLR microphone input, so any professional dynamic or self-powered mic with an XLR cable should work. Other than saying you want to "collect sound", you don't say what the application is, but if this is reporting or news gathering, you could try the Beyerdynamic M58, although there are many mics that would fulfil this task.

I have been happy with my Sony handheld for general recording: so far, I used it to record a motorcycle engine, xylophone, and insects. I think I will use Nagra for voice (speech) and music(Classical/Jazz in small spaces).

I thought about getting a cheap (under $100), general all around mic, if there is such a thing, as I am dying to try out the Nagra. But, I decided to get a decent one in $200-$400 price range, since I will need one anyway.

I will check out M58, I appreciate it.

The Beyer M58 is specifically a reporter's mic. Since you have now mentioned other things you may want to record, you could well be better off trying a standard dynamic mic such as the Shure SM57. Use a wind shield with it for vocal or outdoor work.