Lens Stuck Wide Open on K-5 - Can't Get to a Higher Aperture

Julie · 02-25-2012, 07:35 PM

Thanks so much, everyone!

Turns out the problem was that I didn't screw the screws in tight enough... haha. So glad it wasn't serious.

Last edited by Julie; 03-05-2012 at 07:29 PM.

mtansley · 02-25-2012, 07:45 PM

Are all the little balls that touch the lens mount in their proper places and not accidentally pushed down below the surface of the lens mount on the camera?

I have one lens that won't stop down on my K-5, it seems like one of the balls doesn't make proper contact with the lens and therefore doesn't get grounded although all my other lenses work fine in all modes.

I believe you can try shorting all the balls to the camera lens mount with a bit of wire or metal tape and see if the camera then thinks things are correct.

**jatrax** · 02-25-2012, 07:49 PM

You are a lot braver than I am!

It sounds like when you took the mount off some of the electrical contact pins became disconnected. Take a good look at them and see if any are not sticking out as far as the others. On my K-5 (from the bottom) the first is gold, the next three are silver, the next one is a little different flatter maybe and the last two are silver again. If you run your finger over them they should dip slightly as you pass since they are spring loaded underneath.

You might try cleaning the contacts before you take it apart again but I am guessing one or more of the pins is either disconnected or miss-aligned.

**stevebrot** · 02-25-2012, 10:05 PM

Originally posted by mtansley

I have one lens that won't stop down on my K-5, it seems like one of the balls doesn't make proper contact with the lens and therefore doesn't get grounded although all my other lenses work fine in all modes.

That one "ball" would be the "A" contact. It normally retracts when the aperture ring is off the "A" setting and is responsible to letting the body know that an "A" contact lens is mounted.

Steve

02-25-2012, 07:35 PM	#1
Julie Veteran Member Join Date: Aug 2010 Location: Illinois Photos: Gallery \| Albums Posts: 1,067	Lens Stuck Wide Open on K-5 - Can't Get to a Higher Aperture Thanks so much, everyone! Turns out the problem was that I didn't screw the screws in tight enough... haha. So glad it wasn't serious. Last edited by Julie; 03-05-2012 at 07:29 PM.

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02-25-2012, 07:45 PM	#2
mtansley Veteran Member Join Date: Oct 2008 Location: Ajax, Ontario, Canada Photos: Gallery Posts: 1,139	Are all the little balls that touch the lens mount in their proper places and not accidentally pushed down below the surface of the lens mount on the camera? I have one lens that won't stop down on my K-5, it seems like one of the balls doesn't make proper contact with the lens and therefore doesn't get grounded although all my other lenses work fine in all modes. I believe you can try shorting all the balls to the camera lens mount with a bit of wire or metal tape and see if the camera then thinks things are correct.

02-25-2012, 07:49 PM	#3
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 11,799	You are a lot braver than I am! It sounds like when you took the mount off some of the electrical contact pins became disconnected. Take a good look at them and see if any are not sticking out as far as the others. On my K-5 (from the bottom) the first is gold, the next three are silver, the next one is a little different flatter maybe and the last two are silver again. If you run your finger over them they should dip slightly as you pass since they are spring loaded underneath. You might try cleaning the contacts before you take it apart again but I am guessing one or more of the pins is either disconnected or miss-aligned.

02-25-2012, 10:05 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 32,666	Originally posted by mtansley I have one lens that won't stop down on my K-5, it seems like one of the balls doesn't make proper contact with the lens and therefore doesn't get grounded although all my other lenses work fine in all modes. That one "ball" would be the "A" contact. It normally retracts when the aperture ring is off the "A" setting and is responsible to letting the body know that an "A" contact lens is mounted. Steve