K-7 startup is this normal?


Link Posted 28/10/2010 - 15:25
Just got my K-7...

On startup it makes this sound- churrk!

Its not the sound of the sensor clean function... its a much higher pitched sound (which the camera does after this churrk sound)

The K-7 I rented did not make this churrk sound.

It doesn't look like I can do attachments... here's links to the videos I shot of startup-
(K-7 with and without lens)
http://www.mediafire.com/?c09m307mc200ei3 http://www.mediafire.com/?6611294cb9bsocd


Link Posted 28/10/2010 - 17:59
Might be better to put them on youtube, I'm sure I'm not alone in being unwilling to download .avi files from an unknown source.
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -


Link Posted 28/10/2010 - 18:01
No you're not alone!
Best regards, John


Link Posted 28/10/2010 - 18:50
The sensor clean on the K-7 sounds like a brief high pitched noise, not the brrrr-thunk! of previous Pentax DLSRs. You can no longer feel the vibration either. It's all supersonic now, don't you know.

I think mine makes that noise on start up too. Now I'm going to go and check for sure.
Last Edited by Pentaxophile on 28/10/2010 - 19:05


Link Posted 28/10/2010 - 18:52
sounds like a duff one to me send it back.


Link Posted 28/10/2010 - 19:24
Tried it on mine. I get a chrrk followed by the high pitch dust removal sound (sounds a bit like a rusty hinge squeak). The first sound is very similar to the optical dof preview noise on my k200d.

Removing the lens changes the sound making it a lot more subdued. It is almost as if the camera is stopping the lens down briefly when you turn it on.

I didn't pay any attention to this until I saw this thread! Now i'm wondering...


Link Posted 28/10/2010 - 19:49
I read this and tried it as well my K7, makes churkkkk noise then high pitch of the cleaning, as new to pentax I thought this normal...... some expert please tell it is normal on startup !!!


Link Posted 28/10/2010 - 20:42
The aperture does briefly stop down when the camera is turned on. Is this the churkkk you're hearing? Look down the lens while powering on. You'll also notice is slightly when looking through the viewfinder.
Some lenses might be louder than others??
Last Edited by amoringello on 28/10/2010 - 20:43


Link Posted 28/10/2010 - 20:46
I also get a chrrk followed by the high pitch dust removal sound on my less than a month old K-7.

Regards, Chris.
My Website


Link Posted 28/10/2010 - 23:05
Interesting, I'm not alone... did Pentax intentionally make the aperture churrk in their latest firmware update?

With my pentax 18-55 and 50-200mm lenses, the churrk is not subdued.

In some troubleshooting, I did determine that it was indeed the aperture solenoid causing the sound.

But I got an RMA/store return so I'm sending it back for good measure, its to avoid a lemon/duff camera.

What is weird is that the rented K-7 didn't do this and the Pentax rep said that I should only hear the ultrasonic dust removal.

So after the weekend, I should be getting a replacement camera =)


Link Posted 29/10/2010 - 00:00
my k7 never did it.


Link Posted 29/10/2010 - 09:52
My K7 does this (I have the snesor cleaning disabled at start-up). Don't know what it is though!


Link Posted 29/10/2010 - 11:33
Seen at the 'other place':

All kidding aside, this is apparently normal. Pentax Europe GmbH addressed this concern in a FAQ media release:


"When you turn the camera the camera makes a strange noise. A strange "noise and beep" is heard.

In the K-7, the aperture control is provided with a motor. Once powered up, it goes into the standby position. The difference between old/new and mechanically/electronically is especially audible using old K-lenses and the Low Beam key is engaged. Ultrasonic sensor cleaning in the K-7 is done on start-up. This process can be perceived as a high frequency sound."

I have no idea what the reference to a "Low Beam Key" means.
Arie Intveld

concerning the "low beam key": thats just a translation error. in the original text it says "Abblendtaste" which would translate into DOF-Preview (the one at the on/off switch).

So the sound is normal, just the aperture control motor powering on.


Link Posted 09/11/2010 - 03:53
Just to update, my replacement camera still makes the startup chrrk,

I have a feeling it's because I've got the latest firmware, not a bugging out aperture solenoid.

I'm not buying from tristatecamera.com again, they do not use enough packing material or protection for $1000 cameras (Pentax MSRP)

My camera was not damaged, just in my experience shipping glass elements and etched glass signs, we don't let it leave without 6-sides of protection.


Link Posted 09/11/2010 - 10:19
FYI, brand new K5 does the same thing, but perhaps a little quicker. Hard to catch the aperture closing.
So it certainly seems to be an intended behavior, even if introduced with some firmware update on the K7.

My guess? ... some sort of calibration is made to make sure the lens aperture ring is working or that it is in the 'A' position.
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