Basically just took out the yellow and green. I don't expect this to do very well, but I took a lot of photo's this week looking for something great. I didn't get what I wanted, but didn't want the week to be a total loss :)
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I like this picture alot, and I like the sharpness indeed! I am waiting for a 28mm 2.8 lense, that is why I am scanning the web for great pics, taken with it. This one is Topclass.
Looks like a normal picture........ I have grey and metal tacks in my desk at work. On close inspection - I'm guessing you changed the yellow's to greyscale, but, missed the yellow reflection comming off the clear tacks. A well focused picture, but, you needed to consider if the viewer would recognize the missing color. And you needed a bit more time on this to remove the yellow reflections.