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Forum: Pentax K-5 & K-5 II
03-05-2013, 03:19 AM
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>>>The K-5 manual offers the following specs recommended for an external mic: operating voltage of 2.0V or lower, and an impedance of 2200 ohms. Do I need to match these specs to a mic or not? <<<
In my opinion there is no problem. Ready microphones, that can be connected to any recording device, they have their own power supply. I have done two DIY attempts. First: I used a very old microphones without any case, each of the three leads. Second: I used microphones removed from the 20-year old Hi-8 camcorder Sony, also with three terminals each. Both sets worked with K-5 well, K-5 gives enough power.
Later I hooked up Hi-8 camera microphones to a 9V battery and to K-5 through the capacitor and resistor. They work very well, but… Mounted on the K-5, mics pick up the noise generated by the CMOS sensor stabilizer. In a silent place such a noise can be heard with the naked ears. Image stabilizer is driven by pulses. I think it is not possible to entirely disable the drive. I noticed that when the Shake Reduction is OFF and Horizon Correction is OFF, the CMOS sensor stabilizer is still under control. I think stabilizer is fighting gravity to ensure proper CMOS position relative to the central axis of the lens. The control can still be heard as muttering and stomping, but unfortunately it also records ... Microphone holder must be soft and well insulated from the camera body.
I am not fully satisfied: when I play video recorded with K-5 and external stereo mics, I hear additional ticking of regular pulses coming probably from the K-5 electronics, I do not understand what is going on. I will come back to my DIY inventions later, during summer.
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Forum: Pentax K-5 & K-5 II
05-18-2012, 12:22 AM
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Hello!
This is my first presence here on Pentax Forums.
I bought K-5 a week ago. Yesterday I made some experiments with attaching stereo mic taken from a very old Hi-8 damaged camera. No additional batteries because K-5 at record movies mode generates 2V DC at L/R mic input channels so mic connection is very simple. Recorded sound quality is surprisingly good as for such a low 32 kHz sampling.
I am sorry maybe such an idea is boring. Is there a do it yourself forum, if yes please tell me.
Best Regards,
a.
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