[dflorez]

Howdy!

So, the past few weddings I've shot with my k1, a very peculiar thing has been happening. While in manual or TAV mode, I keep my shutter controlled by the dial next to my thumb. As I'm taking photos in succession, I'll notice as they get progressively darker or grainier, more often when doing pretty active shoots.

For example, during a first dance (indoors, where I'd really like to keep my shutter around 1/125 to 1/80th) my first photos will be where I placed it, and within 3 or 4 photos later it'll have jumped up to 1/320 or 1/400... which is totally unnecessary. In extreme cases that I won't be looking at my lcd screen afterwards, I'll see it jump up to well over 1/1000ths of a second. During down times at the event, I'll try to replicate the possiblities. For instance, maybe I'm rubbing the dial with my face somehow, or as it's slung over my shoulder, its rotating on my back... No matter what I try, I can't get it to creep upwards like that. I've kept the camera in good condition over the past year, the buttons still have their respective amount of resistance! I've also updated the firmware to the most recent.

This has really only started happening in the past few months.

Has anyone had any issue remotely similar?

[Ole]

I haven't seen this happening. Shooting in the dark here: make sure that custom function 4 (Auto EV compensation) is off. That's the only customization that I can think of that would allow the camera to change your settings in M and TAv mode.

The other potential cause could be if you accidentialy hit the green button.

[derekkite]

I have been seeing that, not sure what was happening, It seemed to be as the battery was close to being empty.

[repaap]

Howdy!

So, the past few weddings I've shot with my k1, a very peculiar thing has been happening. While in manual or TAV mode, I keep my shutter controlled by the dial next to my thumb. As I'm taking photos in succession, I'll notice as they get progressively darker or grainier, more often when doing pretty active shoots.

For example, during a first dance (indoors, where I'd really like to keep my shutter around 1/125 to 1/80th) my first photos will be where I placed it, and within 3 or 4 photos later it'll have jumped up to 1/320 or 1/400... which is totally unnecessary. In extreme cases that I won't be looking at my lcd screen afterwards, I'll see it jump up to well over 1/1000ths of a second. During down times at the event, I'll try to replicate the possiblities. For instance, maybe I'm rubbing the dial with my face somehow, or as it's slung over my shoulder, its rotating on my back... No matter what I try, I can't get it to creep upwards like that. I've kept the camera in good condition over the past year, the buttons still have their respective amount of resistance! I've also updated the firmware to the most recent.

This has really only started happening in the past few months.

Has anyone had any issue remotely similar?

I haven't seen this happening. Shooting in the dark here: make sure that custom function 4 (Auto EV compensation) is off. That's the only customization that I can think of that would allow the camera to change your settings in M and TAv mode.

The other potential cause could be if you accidentialy hit the green button.

I'd say that it is more than possible to have hit the green button. And while you are at it, make sure how your settings will be affected if you hit 'green button' in TaV or any other mode.

[rangercarp]

I have found the front e dial on my K-5 sometimes gets turned when I have the camera slung over my shoulder. I always sling the camera, with the front and top toward me. Before today I never gave this much thought, beyond being annoyed when it happened. So I just spent a few minutes seeing if I could recreate it. It was very easy to do so, especially when I pushed the camera slightly behind me, which I often do when carrying it.

Next I turned the camera around (LCD against my side, lens pointing away) to see if I could do the same with the rear e dial. I was able to, but it seemed a little harder than it is with the front e dial. It is possible there is a specif motion you do that could be the culprit, as I just discovered is the case for me.

[jbinpg]

Does the Lock function on the K-1 mitigate this problem?

[Adam]

It's possible to inadvertently change the shutter speed or aperture during instant review. Perhaps that's happening?

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

[Tas]

Has anyone had any issue remotely similar?

Yes. Though my experience is different as it's not related to shutter speed but if nothing else hopefully what I share can be crossed off your fault checking list.

My situation.

I was using shutter priority AE and shooting Constant-High on the K-1 with the D-FA 150-450 at a motorcycle racing event. The conditions were overcast, I was shooting contre jour and the light was changeable though due to the cloud better than direct sunlight. My problem happened a few times and it seems to be linked to when I zoomed the lens. This leads me to draw three conclusions:

1. It could be the lens
2. It could be motion of the lens on the mount.
3. Both of these conclusions could be wrong.

This series is one of a couple I have where I was tracking a rider with the lens out at 150mm. This was helping me acquire the subject, get AF to lock on and I would zoom in to get closer whilst using back button focus and releasing the shutter. The intent was to get closer to my subject by zooming as opposed to staying out at 150mm or being zoomed into a longer focal length and then struggle to acquire the subject and get it focused.

Here's a sequential series I captured.









NOTE: So in shutter priority AE with minimal changes to the light the results were um; noticeable?

Something of note with these images is the metadata the camera recorded for this series of images captured with the D-FA 150-450. Here's the summary:

• Image 1. FL-2520mm, ISO-800, S/S-1/1250s, Aperture-f13
• Image 2. FL-150mm, ISO-800, S/S-1/1250s, Aperture-f22
• Image 3. FL-20mm, ISO-800, S/S-1/1250s, Aperture-f5
• Image 4. FL-None recorded, ISO-800, S/S-1/1250s, Aperture-f5

I posted this problem nearly two years ago but no responses enabled me to determine what was actually happening hence I think something odd with the lens or loss of contact between lens/camera as I was zooming the lens. That other thread used to be a sticky for reporting problems with the K-1 and whilst I expect it's still around somewhere its relevance would have ceased some time ago so I'm not sure how to go about finding it or whether there's info there worth checking.

Based on my experience, which is admittedly different to yours I'd suggest you check the image metadata. I'd also reflect on whether you might have been zooming a lens or manually focusing a lens as the rotational motion might be a contributor. Or not.

Good luck with what you find out, don't forget to post your results if you get to the bottom of it.

Tas