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08-03-2015, 08:01 AM   #1
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K20 Frustrations

Is it possible the auto focus settings are out of whack on my K20D? I took some pics of an eagle that wasn't that far off with my k20 and Tamron SP 70-200 F/2.8 Di lens. Camera states it was in focus.... the little hand indicated the anti - shake was in play.... and it's grainy.




Close up... I can get tack sharp shots. Is this another reason to upgrade to a K3 ?

08-03-2015, 08:21 AM   #2
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What settings are you using?
08-03-2015, 08:39 AM   #3
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Normally auto focus single. Center - weighted metering.

---------- Post added 08-03-15 at 08:41 AM ----------

Would dust/dirt cause this issue?
08-03-2015, 09:10 AM   #4
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QuoteOriginally posted by kentster Quote
Normally auto focus single. Center - weighted metering.

---------- Post added 08-03-15 at 08:41 AM ----------

Would dust/dirt cause this issue?
Grainy? What ISO were you shooting?


Steve

08-03-2015, 09:44 AM   #5
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https://www.dropbox.com/sh/cqyg4inyqk5f3k3/AAD_toBZgYWJiK6gMEzZqCI6a?dl=0




Here's a link of 5 pic I took from a tripod.... using the 2 second delay dealio to minimize any camera shake. I went into the custom menu and did the adjust focus. -10, -5, 0, +5, +10. This is only the first lense I have done this with. Thoughts ?

---------- Post added 08-03-15 at 09:55 AM ----------

100 iso
08-03-2015, 10:51 AM   #6
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QuoteOriginally posted by kentster Quote
Here's a link of 5 pic I took from a tripod.... using the 2 second delay dealio to minimize any camera shake. I went into the custom menu and did the adjust focus. -10, -5, 0, +5, +10. This is only the first lense I have done this with. Thoughts ?
All five photos were taken with the DA 18-55 kit lens. Are you having problems with that lens as well?

Steve
08-03-2015, 11:22 AM   #7
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I am...it seams like it is accurately focusing as well.
08-03-2015, 12:38 PM   #8
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The photos you linked look sharp to me. Could shallow depth of field be the issue?


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08-03-2015, 12:45 PM   #9
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Grainy shots usually are the result of high ISO and the impact of NOISE on the files. Blurry results are more likely to be from camera movement, missed focus, etc.

Do you have the Eagle picture to share?
08-03-2015, 06:32 PM   #10
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Thanks for peeking at it.
Attached Images
View Picture EXIF
PENTAX K20D  Photo 
08-03-2015, 06:39 PM   #11
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The forum limits size and thus resolution. Can you upload to Flickr or somewhere like that or take a crop of just the eagle.
08-03-2015, 09:05 PM   #12
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QuoteOriginally posted by UncleVanya Quote
The forum limits size and thus resolution. Can you upload to Flickr or somewhere like that or take a crop of just the eagle.
or put the original in the drop box?


Steve
08-03-2015, 09:11 PM - 1 Like   #13
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QuoteOriginally posted by kentster Quote
Thanks for peeking at it.
OK...these things I noticed first off...
  • f/5 on a 200mm lens is fairly limited DOF The eagle may be a little behind the plane of focus, though not much.
  • You could have safely been shooting at ISO 400 and gained two more stops of DOF
  • The eagle is underexposed by about two stops due to it being back-lit by the sky. That is why it looks a little dull. It may be possible to bump the values of the head in PP while holding the body low to increase the contrast overall.
If you were to have it to do over, ISO 400 or 800 and f/8 with +1.0 to +1.5 stops exposure compensation.


Steve
08-03-2015, 10:05 PM   #14
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Cool... i'll throw it in the drop box folder. I guess I thought ISO 100 was the better way to go. I'm learning. Do you think with these changes the detail would have been much better?
08-04-2015, 05:54 AM   #15
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ISO is a trade off. 100 is great - unless you give up too much aperture and shutter speed to use it.
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