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06-16-2009, 03:59 AM   #1
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Crazy SR with my messed up 50mm 1.2

Hi Guys,

You may or may not have read about my beaten up 50mm A 1.2.

Story here - https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/63399-my-50mm-...w-proceed.html

I noticed something very wierd in the short time I had it today.

While walking around with it on, my SR was going nuts. I've never felt or heard my SR go off so violently.

It didn't feel wrong, in fact the best way to set it off was walking. Each step I landed gave me a rhythmic buzz from the SR.

I have no doubt it was doing the right thing, but I've never felt SR come on so strong on any of my other lenses ever.

Wierd or not?

06-16-2009, 07:06 AM   #2
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haha it does sometime go crazy, especially when there is very small movement. There is one time I set my camera in a cheap tripod which it kinda shaky with my 400mm on, the SR making that crazy sound too when taking long exp shots :P I turn the SR off immediately when I heard that XD

What focal length you have set it to be? it shouldn't really go crazy if you set it to 50mm. For wider angle it doesn't move much less too.

Last edited by vizjerei; 06-16-2009 at 07:35 AM.
06-16-2009, 07:09 AM   #3
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I don’t get it, do you walk around with the shutter open?
06-16-2009, 01:47 PM   #4
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probably it was the shaved off aperture lever and missing pin?

06-16-2009, 05:42 PM   #5
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I had the focal length set to 50mm. I was walking around with it in my hand. I found that it didn't matter whether I had my finger on the trigger (half press) or just walking around.

It was very bizarre.
06-16-2009, 07:22 PM   #6
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Oh cover up the remaining two contacts or remove them. The remaining contacts are messing up the camera.
06-17-2009, 12:10 AM   #7
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Well it's gone back now. But it only had one contact (which was missing)

I thought the 1.2 only required 1 contact because it's on the upper end of the scale for F-Stop.
06-17-2009, 04:25 AM   #8
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QuoteOriginally posted by Skyntara Quote
I had the focal length set to 50mm. I was walking around with it in my hand. I found that it didn't matter whether I had my finger on the trigger (half press) or just walking around.

It was very bizarre.
Strange considering the SR motors isn’t engaged at all until the shutter is actually open. Not even during half press.

06-17-2009, 04:35 AM   #9
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Are you sure?

I thought they move predictively based on recent patterns. That's why you have to wait for the SR symbol to light up in the viewfinder before you shoot if you want to utilise SR.
06-17-2009, 05:21 AM   #10
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Yes I’m sure, but you are right too. During half press the “shake sensors” are active analyzing the movements, but the SR-servomotors doesn’t engage until the shutter is about to open.
06-17-2009, 04:20 PM   #11
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That is really bizarre then. No Idea what could have been happening.
06-17-2009, 05:51 PM   #12
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Sounds to me like the dust removal system was activating. Is it set to activate every time you power up the camera? If so, the (slightly) logical explanation is that the camera was switched on, and a battery contact was intermittent, making and breaking the circuit with each footstep.
06-18-2009, 01:56 AM   #13
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Interesting.

I was using a battery grip. They have been know to do strange things with power if the contacts are a little dirty right?
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