Nikon 18-105 VR

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19 May 2011 - 9:51 PM

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19 May 2011 - 10:16 PM

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How are you assessing sharpness, John? You really need to use a proper chart to do it in a meaningful way.

Using group shots of people, for example, means that you are not comparing like with like, For example, the face of someone in a group taken at the longer FL end of the range will not need to be enlarged on your monitor as much to appear the same size as the face in the same group taken at the short FL end of the range.

In other words, you may be looking at a greater enlargement of details in the w/a shots, which would, of course, magnify any unsharpness.

The opposite factor can also apply, of course - any camera shake will be more obvious in shots taken at the longer end of the range.

One think to bear in mind is that a large-range lens such as the 18-105mm is a bit of a compromise and you would not expect as good sharpness as you might with a lesser range lens, such as a 24-70mm or, of course, a prime lens. Having said that, though, there should not be any significant difference in images viewed on a computer monitor unless you view heavy crops of the frame, nor should there be a huge difference in prints of up to A4, again from the whole frame.

But, back to where I started - best plan if you have doubts, is to get hold of a proper lens test chart and a really steady tripod and do the tests.

LenShepherd (e2 Member)

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20 May 2011 - 9:22 AM

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Quote: I took a group photo at a rugby match and for some reason the photo doesn't seem as sharp at wide angle then when zoomed in.

Maybe you need to think more about which subjects you choose for AF, and in particular what you choose to focus on.
Your camera instruction book mentions 6 type of subject which can result in "soft" focus.
The guidance is repeated at https://nikoneurope-en.custhelp.com/app/answers/detail/a_id/4585
The instructions with your 18-105 targets type 4 and 6 are the ones most likelyresultsukt in soft focus. These types of target are most likely to be encountered "zoomed out" at wide zoom settings.