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01-05-2010, 08:34 PM   #1
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I broke my camera and I couldn't be happier!

I wish I could tell everyone how to do this but I shorted out the SDM on one of my K20D's at the begining of a wedding on the 31st.

It was dark and I was changing lenses from the FA50mm to the DA*16-50mm. I did it quickly and didn't line the mount up straight. I turned the lens on the mount and realized it was not going on properly. So when I remounted the lens, the SDM stopped working. I shot about 150 images that night after wards and the lens was using the screwdrive.

So the next day I took a couple hundred test shots and all the time it was SD focusing. But it's not the lens. It's the body. The SDM still works on my other K20D and my K10D. So some how I shorted out the SDM on that one body.

I shot another wedding on the 2nd and used the combo a lot. The SDM didn't work at all and the camera otherwise is working normally. It's probably taken 2000 shots since this happened.

I could not be happier, the lens focuses faster and more accurately. This camera is not going in for repair.

My only guess is I shorted the 2 small pins inside the mount/mirror box. Does anyone know if they have anything to do with the SDM?

01-05-2010, 09:00 PM   #2
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QuoteOriginally posted by Peter Zack Quote
I wish I could tell everyone how to do this but I shorted out the SDM on one of my K20D's at the begining of a wedding on the 31st.

It was dark and I was changing lenses from the FA50mm to the DA*16-50mm. I did it quickly and didn't line the mount up straight. I turned the lens on the mount and realized it was not going on properly. So when I remounted the lens, the SDM stopped working. I shot about 150 images that night after wards and the lens was using the screwdrive.

So the next day I took a couple hundred test shots and all the time it was SD focusing. But it's not the lens. It's the body. The SDM still works on my other K20D and my K10D. So some how I shorted out the SDM on that one body.

I shot another wedding on the 2nd and used the combo a lot. The SDM didn't work at all and the camera otherwise is working normally. It's probably taken 2000 shots since this happened.

I could not be happier, the lens focuses faster and more accurately. This camera is not going in for repair.

My only guess is I shorted the 2 small pins inside the mount/mirror box. Does anyone know if they have anything to do with the SDM?
I believe that those are the pins that supply power to the SDM motor. Those pins are also what supply power to power zoom lenses, so I bet that you just fried the little power supply chip that goes to those pins. I doubt that power zoom would work anymore with that camera...but who really cares about that anyways?

Hopefully your little "accident" won't have any future repercussions. Interesting tale though, thanks for sharing!
01-05-2010, 09:03 PM   #3
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If that's what they do, then great. Even if I did own a PZ lens, I'd never use that feature.
Could it really be that easy to make your SDM an SD lens?
01-05-2010, 09:11 PM   #4
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What Pentax needs to with future cameras is give the photographer the option of turning SDM on and off. But, really, while I'm pleased Peter is pleased... what is wrong with this picture? When a photo professional is happy when a high-profile feature (for which one pays a hefty premium) fails, there is something very, very wrong. I hope someone from Pentax is reading this string.

01-05-2010, 09:33 PM   #5
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Wow! That's great news, I really wished I kept my 50-135 so I could give this a try. =P
01-05-2010, 09:48 PM   #6
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Dave, got your 50-135 on my Kx right now
01-05-2010, 10:13 PM   #7
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how bout covering up the SDM contacts? that might work !
01-05-2010, 10:13 PM   #8
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Peter, I'm keeping your story in mind for shorting out my own SDM contacts once I've become fed up with my 16-50's focusing.
Good result from a bad event for you.
Thanks for sharing it.

01-06-2010, 02:30 PM   #9
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Peter - I have it on reasonable authority that the two contacts you mean are the power zoom supply.

I would be very careful about shorting or covering contacts. The results may be expensive.
01-06-2010, 02:34 PM   #10
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QuoteOriginally posted by Oggy Quote
I would be very careful about shorting or covering contacts. The results may be expensive.
Somehow I read that as "The results may be explosive." I need sleep.
01-06-2010, 02:53 PM   #11
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QuoteOriginally posted by Peter Zack Quote
I could not be happier, the lens focuses faster and more accurately. This camera is not going in for repair.
Peter,

Two questions about the findings: how faster/more accurate is the lens under SD mode?

And if it is that much better, are you attempting blocking or shorting out the pins on the other body?


Keep us update!

Later

BB
01-06-2010, 03:26 PM   #12
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QuoteOriginally posted by Peter Zack Quote
I wish I could tell everyone how to do this but I shorted out the SDM on one of my K20D's at the begining of a wedding on the 31st.

It was dark and I was changing lenses from the FA50mm to the DA*16-50mm. I did it quickly and didn't line the mount up straight. I turned the lens on the mount and realized it was not going on properly. So when I remounted the lens, the SDM stopped working. I shot about 150 images that night after wards and the lens was using the screwdrive.

So the next day I took a couple hundred test shots and all the time it was SD focusing. But it's not the lens. It's the body. The SDM still works on my other K20D and my K10D. So some how I shorted out the SDM on that one body.

I shot another wedding on the 2nd and used the combo a lot. The SDM didn't work at all and the camera otherwise is working normally. It's probably taken 2000 shots since this happened.

I could not be happier, the lens focuses faster and more accurately. This camera is not going in for repair.

My only guess is I shorted the 2 small pins inside the mount/mirror box. Does anyone know if they have anything to do with the SDM?
Congratulations peter

you have discovered a user implementable software fix for the people wwho want tu use screw drive as opposed to SDM. Just tape over the KAF2 power pins
01-06-2010, 03:36 PM   #13
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QuoteOriginally posted by Biro Quote
What Pentax needs to with future cameras is give the photographer the option of turning SDM on and off. But, really, while I'm pleased Peter is pleased... what is wrong with this picture? When a photo professional is happy when a high-profile feature (for which one pays a hefty premium) fails, there is something very, very wrong. I hope someone from Pentax is reading this string.
Amen to that!
01-06-2010, 03:40 PM   #14
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You could make a lot of people happy by figuring out what you did "wrong!"
01-06-2010, 03:52 PM   #15
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What's that smell?!

Oh, it's all the Pentaxians with defective SDM lenses short-circuiting their camera bodies. Nothing to worry about.
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