Videomaker – Learn video production and editing, camera reviews › Forums › Technique › Sound › How much do XLR to 1/8-`inch adapters degrade sound? › I agree with jleinung.
I agree with jleinung. Typically, DSLRs have crappy preamps, causing audio quality to be lost in the camera, not necessarily in the line. You would probably get better results from an external recorder. In my productions, I always either use an external recorder, or, if I’m going to record directly into the camera, I use an external preamp like my Beachtek DXA-SLR Ultra.