Any trick to tighten the mount?

anemone · 11-28-2016, 02:16 PM

Sorry I wrote in a hurry my last post.

The problem is that autofocus drops out and M is lighted in viewfinder. Rotating the lens in mount fixes that. And it moves quite easily. Generally all my lenses have small play so I can tilt it vertically or horizontally. There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. However there isn't any light leak. For comparison all my lenses are rather tight fits to old K100 body. Some rotational play is in locking pin but k-3 ~~is much more looser~~ isn't as that tight as K100.

The 150-500 is mounted from lens. It is so heavy and long that my figure of nerd can't handle it. But still when I aim the camera, there is some torsion and it requires very gently touch to do that. It takes all the fun out to just think if AF will be there when I move the camera. So that's the qualification of horrible.

I keep wondering. The 70-300 has screw drive and it suffers also. Is it some pin with bad connection after all making these problems?

I wiped mount and flanges and got my wipe black. Tomorrow is again shooting day and I'll let you know if there is any difference.

**UncleVanya** · 11-28-2016, 02:21 PM

Originally posted by anemone

Sorry I wrote in a hurry my last post.

The problem is that autofocus drops out and M is lighted in viewfinder. Rotating the lens in mount fixes that. And it moves quite easily. Generally all my lenses have small play so I can tilt it vertically or horizontally. There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. However there isn't any light leak. For comparison all my lenses are rather tight fits to old K100 body. Some rotational play is in locking pin but k-3 ~~is much more looser~~ isn't as that tight as K100.

The 150-500 is mounted from lens. It is so heavy and long that my figure of nerd can't handle it. But still when I aim the camera, there is some torsion and it requires very gently touch to do that. It takes all the fun out to just think if AF will be there when I move the camera. So that's the qualification of horrible.

I keep wondering. The 70-300 has screw drive and it suffers also. Is it some pin with bad connection after all making these problems?

I wiped mount and flanges and got my wipe black. Tomorrow is again shooting day and I'll let you know if there is any difference.

This just sounds like awful mount tolerance. Has this camera been dropped? I can't imagine being able to get 1-2 mm of rotation or being able to get any tilt out of a mounted lens. Something is rotten. I would suggest this camera and some lenses be taken to a repair shop - particularly since it seems camera body specific. I stand by my statement earlier - perhaps the Adaptist mount replacement would be your cheapest option - it provides a new mount that is known to be flat and works. WR will be less but that's better than a sloppy mount.

Pentax K+ Multi-Mount (WR version) - Adaptist

---------- Post added 11-28-16 at 04:23 PM ----------

BTW - on the Adaptist website they talk about their mount and how the mount can become looser fitting for K mount lenses over time. They suggest fixes on this page - they may generalize to your original equipment mount also.

Remedial action for Loosened K mount lens mounting - Adaptist

MarkJerling · 11-28-2016, 02:28 PM

Originally posted by anemone

... And it moves quite easily. Generally all my lenses have small play so I can tilt it vertically or horizontally. There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. However there isn't any light leak.

1-2mm is a lot of movement! And, with regard to tilting - that should result in light leaks. I have to ask: Is the mount, per chance, loose on the camera body? Has the camera had a bump or fall?

stevebrot · 11-28-2016, 03:22 PM

Originally posted by anemone

There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable.

That should not be possible. That pin provides registration to the mount contacts. If it is loose that would indicate significant damage has been done to the lens release mechanism and/or the mirror box onto which all of this is mounted.

Steve

**UncleVanya** · 11-28-2016, 03:28 PM

1-2 mm sounds small but it is huge in terms of tolerance - perhaps this is just an estimate that is overly large in units and not an actual distance.

A short video showing the problems would help immensely.

anemone · 11-29-2016, 07:56 AM

Here are some videos to show I'm not crazy. I had phone in one hand supporting the camera and another hand twisting the lens. So it isn't that high quality. And my phone has many features but camera isn't one of the most usable ones.

Youtu.be

Youtu.be

stevebrot · 11-29-2016, 11:41 AM

Originally posted by anemone

Here are some videos to show I'm not crazy. I had phone in one hand supporting the camera and another hand twisting the lens. So it isn't that high quality. And my phone has many features but camera isn't one of the most usable ones.

Pentax 18-135 - YouTube
Sigma 70-300 - YouTube

You've got problems. The video at top show the lens moving sideways as it is twisted. Something is broken.

Steve

MarkJerling · 11-29-2016, 02:36 PM

Originally posted by stevebrot

You've got problems. The video at top show the lens moving sideways as it is twisted. Something is broken.

Steve

I agree. You'll need to have that checked. There's something badly wrong there.

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11-28-2016, 02:16 PM	#16
anemone Senior Member Join Date: Jun 2014 Posts: 165 Original Poster	Sorry I wrote in a hurry my last post. The problem is that autofocus drops out and M is lighted in viewfinder. Rotating the lens in mount fixes that. And it moves quite easily. Generally all my lenses have small play so I can tilt it vertically or horizontally. There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. However there isn't any light leak. For comparison all my lenses are rather tight fits to old K100 body. Some rotational play is in locking pin but k-3 ~~is much more looser~~ isn't as that tight as K100. The 150-500 is mounted from lens. It is so heavy and long that my figure of nerd can't handle it. But still when I aim the camera, there is some torsion and it requires very gently touch to do that. It takes all the fun out to just think if AF will be there when I move the camera. So that's the qualification of horrible. I keep wondering. The 70-300 has screw drive and it suffers also. Is it some pin with bad connection after all making these problems? I wiped mount and flanges and got my wipe black. Tomorrow is again shooting day and I'll let you know if there is any difference.

11-28-2016, 02:21 PM	#17
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,458	Originally posted by anemone Sorry I wrote in a hurry my last post. The problem is that autofocus drops out and M is lighted in viewfinder. Rotating the lens in mount fixes that. And it moves quite easily. Generally all my lenses have small play so I can tilt it vertically or horizontally. There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. However there isn't any light leak. For comparison all my lenses are rather tight fits to old K100 body. Some rotational play is in locking pin but k-3 ~~is much more looser~~ isn't as that tight as K100. The 150-500 is mounted from lens. It is so heavy and long that my figure of nerd can't handle it. But still when I aim the camera, there is some torsion and it requires very gently touch to do that. It takes all the fun out to just think if AF will be there when I move the camera. So that's the qualification of horrible. I keep wondering. The 70-300 has screw drive and it suffers also. Is it some pin with bad connection after all making these problems? I wiped mount and flanges and got my wipe black. Tomorrow is again shooting day and I'll let you know if there is any difference. This just sounds like awful mount tolerance. Has this camera been dropped? I can't imagine being able to get 1-2 mm of rotation or being able to get any tilt out of a mounted lens. Something is rotten. I would suggest this camera and some lenses be taken to a repair shop - particularly since it seems camera body specific. I stand by my statement earlier - perhaps the Adaptist mount replacement would be your cheapest option - it provides a new mount that is known to be flat and works. WR will be less but that's better than a sloppy mount. Pentax K+ Multi-Mount (WR version) - Adaptist ---------- Post added 11-28-16 at 04:23 PM ---------- BTW - on the Adaptist website they talk about their mount and how the mount can become looser fitting for K mount lenses over time. They suggest fixes on this page - they may generalize to your original equipment mount also. Remedial action for Loosened K mount lens mounting - Adaptist

11-28-2016, 02:28 PM	#18
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,422	Originally posted by anemone ... And it moves quite easily. Generally all my lenses have small play so I can tilt it vertically or horizontally. There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. However there isn't any light leak. 1-2mm is a lot of movement! And, with regard to tilting - that should result in light leaks. I have to ask: Is the mount, per chance, loose on the camera body? Has the camera had a bump or fall?

11-28-2016, 03:22 PM	#19
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by anemone There is also some play in locking pin. rotational is 1-2 millimetres on right next to mount and tilting is just noticeable. That should not be possible. That pin provides registration to the mount contacts. If it is loose that would indicate significant damage has been done to the lens release mechanism and/or the mirror box onto which all of this is mounted. Steve

11-28-2016, 03:28 PM	#20
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,458	1-2 mm sounds small but it is huge in terms of tolerance - perhaps this is just an estimate that is overly large in units and not an actual distance. A short video showing the problems would help immensely.

11-29-2016, 11:41 AM	#22
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by anemone Here are some videos to show I'm not crazy. I had phone in one hand supporting the camera and another hand twisting the lens. So it isn't that high quality. And my phone has many features but camera isn't one of the most usable ones. Pentax 18-135 - YouTube Sigma 70-300 - YouTube You've got problems. The video at top show the lens moving sideways as it is twisted. Something is broken. Steve

11-29-2016, 02:36 PM	#23
MarkJerling Moderator Site Supporter Join Date: May 2012 Location: Wairarapa, New Zealand Photos: Gallery \| Albums Posts: 20,422	Originally posted by stevebrot You've got problems. The video at top show the lens moving sideways as it is twisted. Something is broken. Steve I agree. You'll need to have that checked. There's something badly wrong there.