The Sony C-535P is small diaphragm condenser microphone that is rare and no longer made.  The mic is best suited for the recording studio and I haven't used it anywhere else, although I don't think I would even recommend using it outside the studio.  The mic has a cardioid polar pick up pattern and will pick up frequencies between 30 Hz and 20 KHz.

OVERALL OPINION

While I don't own a Sony C-535P myself, I've used it a number of times in a professional studio for a variety of purposes.  In my time using it I've found it to be an overall stellar microphone.  The three applications that I have used it for include acoustic guitar, hi hat and other cymbals, and acoustic piano.  I've found this mic to be perfect for these applications as the C-535P picks up an incredible amount of detail.  While it is a small diaphragm condenser and won't pick up a ton of low end, for applications where this might not be necessary, the C-535P shines.  I haven't had the chance to have extensive use with the mic, but I've used it enough to know that it is versatile and is a great microphone to have around the studio.  This isn't an easy microphone to find as they aren't exactly readily available, but many high end studios still have them.  If you do have this mic or are trying to find some more information about this mic, the info is definitely out there it just isn't easy to find one to actually try out.  However, if you're looking for a top notch small diaphragm condenser, I don't think that you can go wrong with this microphone.  All in all, it's a crystal clear sounding mic and is versatile, and although I'm not sure about the price as it varies, even if you have to pay a bit for this one to me it would be worth it...