Reply #1 - March 02, 2008, 09:19:41 AM
Thought I would compare side by side my 2 camera setups this morning - to make sure that what I suspected (nikon not as close focusing and backfocus) is true. I know that I'm not dealing with macro lenses here - but want to maximize the use of my general purpose lenses. Here are my findings on an available carton of "leche" (milk). The first two images are both full frame from the camera.
I used the Olympus 12-60 at the 60mm setting and got as close as I comfortably could - focus may have still been available a tad closer. Shot wide open at f4 400ISO. This was shot handheld using manual focus with Live View:

I used the Nikon 18-200VR at something close to 60mm on the scale (turned out ot be 56mm) and move in close and then out again until it would lock focus and allow the shutter release to be pressed. Shot wide open at f5 400ISO. This was shot handheld using auto focus as manual focud is almost impossible to do accurately with the D40:

Conclusion - - - as I suspected, the Olympus 12-60 focuses much closer than the Nikon 18-200 at the equivalent setting.
Now this is where I knew that I had issues with the way I use my Nikon camera. I have shot many many tight closeups of flowers, textures etc over the last 4 weeks in Costa Rica - and the Olympus always seemed to provide consistently sharper images and nailed the focus point I was after, far more consistently than the Nikon. Up until this test, I have also used Auto focus with the Olympus 12-60 for those flower and texture shots and found that to be true. For this example I used manual focus on the Olympus to see how accurately the focus point could be held and Auto focus with the Nikon - - - by placing the Focus sensor directly on top of the "2%" text. Both camera sensors filled the frame with the "2%" text.
Close up crop of above image taken with Olympus 12-60:

Close up crop of above image taken with Nikon 18-200VR:

Conclusion - The Olympus lens focus is nailed right on while the Nikon missed the point I was after and is slightly behind (which I have also found to be the case with my D70 and D200 Nikon cameras under certain circumstances)
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Don't get me wrong though. Up until I used both cameras side by side, I was totally happy with the closeup results of my Nikon 18-200 lens and I still use both cameras side by side for my daily shooting. The 18-200 is a wonderful lens for a lot of the work I do and I am finding out that the 12-60 is an awesome lens - particularly for the odd closeups that I want to capture. Only thing better would be a dedicated macro which I don't have and probably would not justify spending the money on.

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Rob
A Creative Edge in Photography by Robert Watcher
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