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10-28-2015, 11:06 AM   #1
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K-50 Focusing Issues - Advice Needed for AF Settings

I am still a K-50 newbie and am heading out on two vacations in November. Doing some "fall" shots, and for some reason every photo is out of focus.

Wondering what focus modes most users use, and perhaps so help or ideas as to what settings I may have set (without realizing) that are throwing the focus off. Everything looks fine through the viewfinder, but when I examine the photos, they're not even close to being in focus.

I have AF.S selected (left side of camera)..., been using the AF 11 mode, but also the AF Spot mode, and I for exposure, am using AV mode. Also, I have stabilization OFF!

Any ideas? Ideal AF Settings?

Thanks!!!

jack

10-28-2015, 11:14 AM   #2
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hm... you have some pictures? Not normal that both the viewfinder and the AF are off... did you check for the right diopter setting(that slider behind the removable eye piece (slides up)?
10-28-2015, 11:16 AM   #3
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Let's see some samples! Also, why are you disabling SR?

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10-28-2015, 11:50 AM   #4
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Thank you for the replies.

I disabled SR awhile back based on input (on this forum) regarding my video issues. Turns out SR and the video issue were unrelated. I attached five photos. IMG 811 is with SR set, and it does look better. I am using a kit 50-200 lens, fully zoomed which might be magnifying camera shake and since it is a rainy wet day (longer exposure), perhaps the focus issue is my unsteady hand....


Last edited by jackloganbill; 03-18-2016 at 06:14 AM.
10-28-2015, 11:54 AM   #5
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QuoteOriginally posted by jackloganbill Quote
perhaps the focus issue is my unsteady hand....
I think so too... in this case I would increase the ISO or at least turn on the SR... but as a general rule you should not try to take a picture hand-held at a shutter speed below 1/60s without SR and even with its quite tricky.
In addition the shutter speed should be -rule of thumb- at least 1/ focal length eg 200mm lens = 1/200s to be able to get a motion free shot in the case of APS-C you should better multiply the focal length by 1.5 (crop factor) and then you get a shutter speed of 1/300s. Don't fear the high ISO better a grainy shot than a shaky shot...:-)
You can try the P mode there you can change the settings or TAv or M mode to see how the three things ISO, Aperture (F-number) and shutter speed (x s or 1/x s) play to together
hope that helps?

Last edited by max_pyne; 10-28-2015 at 12:07 PM.
10-28-2015, 12:28 PM   #6
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Max_Pyne,
Thanks for the instruction. I forget this stuff...will try in a few minutes!

Also I did not realize that there is an SR for stills and a separate firmware SR for video. Evidently, SR for stills does not effect picture quality...

>>>>OK, I tried that and set SR, pictures look much better!!!

Thanks again
jack

Last edited by jackloganbill; 10-28-2015 at 12:48 PM. Reason: Added comment after trying new settings
10-28-2015, 12:40 PM   #7
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https://www.pentaxforums.com/forums/attachment.php?attachmentid=286681&stc=1&d=1446061182
https://www.pentaxforums.com/forums/attachment.php?attachmentid=286682&stc=1&d=1446061182

Last edited by jackloganbill; 03-18-2016 at 06:14 AM.
10-28-2015, 01:22 PM   #8
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Yep, the first shots all got motion blur, not missed focus.

10-28-2015, 02:48 PM   #9
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Now that you are using SR, remember to click the shutter once you see the SR 'hand' icon - this indicates that the SR system is ready to act.

It took me a while to learn this when I got my K-50. I turned SR on and immediately clicked, and was wondering why SR wasn't working!
10-28-2015, 04:35 PM   #10
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As others said, you had motion blur. If your subject is static, the 1/1.5xFL thumbs rule works fine without SR. If you use SR, you can divide this number by 4, or even up to 8 if you're a steady hand. If your subject is moving, rather use at least 1/3xFL. For example, with your 200mm, this would give you 1/300 without SR, between 1/75 and 1/30 with SR, and 1/600 if your subject is moving.
10-28-2015, 10:31 PM   #11
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One of those shots was at 1/20s, Jack, with a 200mm focal length.


Don't try that, especially without SR. It's not worth the damage to your keeper rate.


Let your ISO climb if you must.
10-29-2015, 06:44 AM   #12
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You've got an amazing sensor in the camera, so don't be afraid to venture into higher ISO. Shooting at 200mm is no joke, so you should probably be shooting at ISO 800 in those pics...maybe 1600 if your form is not great. And that assumes SR is on.

I learned a long time ago to err on the side of too high of an ISO, since using too slow of a shutter speed kills sharpness in a lot of telephoto situations.
10-29-2015, 08:43 AM   #13
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QuoteOriginally posted by Edgar_in_Indy Quote
You've got an amazing sensor in the camera, so don't be afraid to venture into higher ISO. Shooting at 200mm is no joke, so you should probably be shooting at ISO 800 in those pics...maybe 1600 if your form is not great. And that assumes SR is on.

I learned a long time ago to err on the side of too high of an ISO, since using too slow of a shutter speed kills sharpness in a lot of telephoto situations.
I concur. The 16MP sensor in the K-50 really is at the sweet-spot of resolution vs. ISO/noise. I have used it at ISO 20,000 at night without regret. In comparison, I rarely take my K-3 above 6400. The smaller pixels of its 24MP sensor just don't see as much light.

Regarding the first picture: at ISO 800 instead of 200, Av mode would have put your shutter speed at 1/200 instead of 1/50. With SR turned on, this should be rock-solid for hand-held shooting.
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