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02-06-2012, 02:23 AM   #31
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I never knew!

05-18-2012, 12:22 AM   #32
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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.
05-28-2012, 09:31 PM   #33
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welcome ams8,
you can try:
Do-It-Yourself - PentaxForums.com
Lot of those old mics did have low cut filter build in so the rumble from the motor would not get recorded but for most human and birds voices should be usable.
03-04-2013, 02:03 PM   #34
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Newbie about these matters. 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?

03-05-2013, 03:19 AM   #35
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QuoteOriginally posted by sholtzma Quote
Newbie about these matters. 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?
>>>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.
03-05-2013, 05:41 AM   #36
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QuoteOriginally posted by ams8 Quote
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.
That's not the hardware but a problem with the codec,it has something to do with the timing of the audio which not all software read correctly.
Use the search tool on the forum for ways around that problem.
03-15-2013, 07:09 PM   #37
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QuoteOriginally posted by Skymist Quote
I searched this and a couple of other threads for someone who asks, "Why are some recommending stereo microphones for a camera which produces a mono 32kHz 512kbps PCM file as its output audio stream?" I don't see any such question so I'll ask it myself. Stereo in does not result in stereo out. Furthermore, why recommend a switched level (Rode, Senn) mic for a camera with AGC which cannot be defeated? All you are likely to get is a "hiss setting" (low) and a "no hiss setting" (high). The sound capability of the K-5 is terribly limited. No one would use it seriously for music, I am sure. I can see why a cheap external mono mic might give some benefits, but possibly not a lot.
According to the K5 manual

QuoteQuote:
If you used an external microphone to record movie sound in stereo, the sound
can be played back in stereo when you use a commercially available HDMI
cable to output the movie to an HDMI-compatible AV device. (p.258) If you use
an AV cable to output the movie, monaural sound is played back.
As I understand it: the sound is played back in stereo under certain conditions (HDMI cable). Stereo only means 2 channels has absolutely nothing to do with quality.
06-25-2013, 07:06 AM   #38
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QuoteOriginally posted by RonHendriks1966 Quote
This is with K-7and DA*55mm and the mic with extensioncord (2 meters) just infront of me.
Beautiful!

Thanks so much for sharing.

06-25-2013, 07:13 AM   #39
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QuoteOriginally posted by sholtzma Quote
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?
No.

Impedance matching is necessary if you want to maximise power transfer.

In audio applications (like connecting an external microphone to a camera) it is better to use "impedance bridging" which uses a low source impedance (e.g., 200 Ohm) and a high load impedance (e.g., 2.2 kOhm). This ensures maximum signal level with minimum distortion. Hence you can also use longer cables without much loss.

Hope this helps.
06-25-2013, 10:13 AM   #40
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QuoteOriginally posted by Class A Quote
Beautiful!

Thanks so much for sharing.
Didn't listen to it for some time, and yes still love it.

She has less performances the last two years but is working on a new album. She (Charlie Dée) was at the 20 year anniversary off "De Kunsthal" (wich is a museum without it's own collection) and made a little clip for the three performers.

K-01 with internal mic.
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