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Old Dec 18, 2010, 9:01 AM   #1
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Default Samsung GX10-20

Hi, I have been using the GX10 for a year or two and have just bought the GX20, finding the focus a tad soft with the 20 !!! anyone else had trouble with this problem ??? any suggestions would be gratefull !!!

Regards Tom
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Old Dec 18, 2010, 6:49 PM   #2
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Hey, Tom.
I had the GX10 before getting the Pentax K20 so, I don't have any experience with the GX20. But, it should be close to the K20 in most ways. before answering your question, I need a little more info. What lens or lenses are you using and are you having trouble with all of them?
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Old Dec 18, 2010, 7:59 PM   #3
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sometimes focus adjustment is needed - can work fine with one body and need adjustment on others i - it could be also that the gx20 is higher resolution mp and your seeing the softness at 100% but if scaled to the same size as those from your gx10 the result would be the same - basically the lens in this example wouldn't be as good as the sensor

but i think the first idea is the most likely print off a focus chart and check it
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Old Dec 18, 2010, 9:34 PM   #4
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In a not-so-serious way I have found that every time I move up to a better camera I am at first disappointed by the results until I learn what is necessary to get the most from the camera. Pentax Optio 33L to Fuji S7000 to Pentax *istDL to Pentax K10D and now the K20D which I haven't gotten to try yet. Each was a big step up but at first gave results that were not immediately apparent as an improvement. With a little tweaking of the controls I soon had the full benefit of the improvement.

Two observations, each time increase resolution and then view the results at 100% you see an image which appears less sharp. Secondly the higher the resolution the more critical lens quality and focus accuracy are WHEN VIEWED AT 100%, at print size they may not be apparent.

Check your autofocus for each lens and adjust if necessary and enjoy. Pixel peeping is not always a productive method to gauge image quality so after you have made your adjustments make some prints and see how they look.

Good luck.
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Old Dec 19, 2010, 3:56 AM   #5
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I only shoot Raw, so when you find the focus a bit soft I guess it's the sharpness settings of the camera.

Dpreview talks about setting the sharpness higher. http://www.dpreview.com/reviews/pentaxk20d/page15.asp

I'm sure the GX20 has the same settings

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Old Dec 19, 2010, 9:39 PM   #6
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There's two things that come to mind. First, I found the K20 out-resolved the kit lens I had and so all of a sudden I could see faults that I hadn't noticed before. So I'd be interested in what lenses you are using.

The second thing I found is that not all of my lenses focused the same way with the K20 as they had with the K10. In the case of the 50-135, it focused much better than it had on the K10. The 12-24 front focused a bit with the K20, while it was more accurate on the K10. The K20 has the ability to adjust the focus - does the Samsung have that capability also? If so, you can shoot a bunch of focus charts to see if that's part of the problem.
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Old Dec 21, 2010, 4:47 AM   #7
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Hi, Thanks for all the replys, I use all Sigma lenes, mostly the 70-200 f2.8. i will try some of your suggestions and get back to you !!!

Many thanks Tom.
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Old Dec 21, 2010, 12:09 PM   #8
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The sigma 70-200 f2.8 is a good lens, my first thought would be either front or back focus issues. I find shooting focus charts very frustrating. Make sure that the chart you choose can only be focused on a center line - I once tried a chart that had all sorts of black lines and my camera consistently chose a lower or upper line to focus on (the sensor is larger than the little red square that lights up). Changed to a chart that had faint grey marks that the camera wouldn't focus on unless it was outside in bright sunlight - that made a huge difference. A chart that's white in the center except for the focus line also works well.
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