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Message: <blockquote data-quote="HarryJ" data-source="post: 2992616" data-attributes="member: 56873">Hi,     commenting to your last list. SD 722 and 744 have a hard disk - If you write to the internal disk and your mics are closeby (up to 2 meters) then you hear the disk in your recordings particularly in silent envoronments. If you write on a CF card, they are silent and excellent. Allthough the recorders you mention can take humidity, liquid water tends to be a killer. In my experience Sennheiser ME62,64,66 can stand humdity. I use ME62 and 64s in prolonged recordings with no problems (-40C ... +30C) even in rather high humidity and thunderstorms. Of course you have to make sure that water cannot get into the mic and that if it happens it drains out.  I have used Sennheiser MKH8020 for long recordings. I have not had any serious problems, but some people reported early on having problems with humidity.When talking about humidity we have to keep in mind water condensation which happens when you take your stuff from cold to warm. This happens in Nordic winters when you bring your stuff in and in the (sub)tropics when you take your recording devices from cooler or airconditioned indoors to the warmer open air. Cover yur stuff even in tropics inside a wool sweater or a blanket and let it get into thermal equilibrium in something like 30 minutes.HarryJ</blockquote>