So many things wrong in this article, I don't know where to start ...
For example, with any of the cameras set to the macro scene mode, you can get significantly closer to your subject matter than with the normal modes. We found that you could easily focus in as close as one foot from your subject. The benefit to this feature is the cost savings involved. Rather than spend a significant amount of money on a macro lens, using this feature solves some of your problem.
Forget the macro modes on P&S cameras, they are all about the closest focusing distance. True macro is about image size vs subject size. Means 1:1 is macro, everything less is not macro. Special macro lenses are constructed to achieve this image ratio and to specialy work at close focus distances. No camera macro scene mode can deliver that.
"Nikon D5000 having the best grip"
This is quite an unusual result. While it is true, you forgot to mention that Nikon is the largest of the bunch and the Olympus is the smallest. Camera size is one of the factors in picking a specific model.
Then, using the arrow keys on the back of the camera body, you can select a focus point that will ensure the image has sufficient depth-of-field for your picture.
Depth of field has nothing to do with focus points. It's a property of the lens.
We understand that this feature isn’t just a gimmick, but we wonder whether it is worth including. The purpose of the SLR form factor, in our opinion, is to provide the experience many photographers had with their older film cameras. If you are that enamored with using the LCD monitor for framing your image, you likely do not require the use of an SLR camera. That said, we would give the edge to both the Nikon and the Olympus for this feature.
Framing in Live View ? I mean you completely left out any comment about Live View. Also you completely left out the screen resolution. Canon has a VGA screen while Nikon/Olympus have a QVGA screen.
The important feature of these lenses is that they are designed and scaled to the size of the imager in this camera. In other words, there will be no multiplier effect as with the EF lenses from Canon.
And again wrong. Yes, the lenses have a reduced image circle to match the smaller imager, NO, you still have to multiply the focal lenght with 1.6 (Canon), 1.5 (Nikon) or 2.0 (Olympus) to get to the true (and only comparable) focal lenght.
Also, there are 3rd party lens makers (Sigma, Tamron, Tokina to name a few). There are also a few key decisions for lens selection:
1. Canon has lens build in motors, so the 500D can use all the EF and EF-S lenses.
2. Nikon has transitioned from in-camera lens motor to lens build in motors for their budget DSLRs (D40, D40x, D60, D5000) not so long ago, so while you can mount ANY Nikoor lens made since about 1960 on the D5000, only AF-S and AF-I lenses will autofocus on it.
3. Olympus has the smallest lens selection (3rd party lens makers are making up for this shortage a bit).
I could write another article just comenting what you got wrong
🙂 I hope you improve on your articles