johnyu said:Effective DOF on DSLR is deeper. Thus, it's harder to get nice out of focus background for portraits with f2.8. (See my post at http://forums.clubsnap.org/showthread.php?t=50797&page=2 )
Let me be a devil advocate on a Nikon forum (I'm a Nikon SLR user):
If one doesn't have an existing system to start with, I believe s/he should consider Canon seriously. Canon has been havng an edge in technologies among the other big manufacturers, including Nikon. (Considering that Canon is the 2nd top company in the world filing the most US patents and does all sort of things outside photography that Nikon doesn't, it is understandable. e.g. Technologies invented for photocopiers can be "reused" in cameras.) So far, every other manufacturer, probably excluding Sony, are playing only catch up with Canon in digital.
My only concern with Canon is it hasn't committed to a fixed FOV factor (Nikon's 1.5x). It makes it hard for a person "graduating" from a low-end body, say 300D, and move to a high-end body (e.g. 1Ds). The set of carefully selected lenses will have a different FOV on a different body...
Actually, in reality there is no significant difference since each company is adopting a different philosophy and stance in this area of photography. I depends on the perception of each individual to decide which is the more appropriate solution for them. There are many who like to harp that Canon is in the lead ... blah blah blah ... but they are only doing it without even knowing what had when on before and is still happening now. Let me elaborate ...
Canon places more emphasis on more variety of models, which in their book is loosely translated as wider choices (ie. FF for 1Ds, 1.3x for 1D and 1.6x for the lower spectrum of the DSLR market). There is an advantage to this move for EF mount users because they benefit by having more choices in the Canon arsenal.
Nikon, on the other hand, places more emphasis on adhering to a more usable, common standard (1.5x FLM). Their move to release DX lenses shows their commitment in making this otherwise "narrower" perspective possible and viable for users in their system. I am not sure about others but I welcome the 1.5x FLM with open arms cuz if you are into the super telephoto thingy (ie. 300 - 800mm primes, etc), you know how much more these really big guns are gonna cost you ... The DX thingy was scorned at, grossly ridiculed by many Canon users until they either see what these DX lenses can give/do or were "zipped" by their "new" EF-S standard, aka the 300D only lens mount thingy, basically the same thing as the DX format but it is clear that Canon is resisting the possibilty of being called "backtracking".
Sure, there are some who goes for the "cosmetics" citing that white tele L lenses are cool but in reality (again), I am sure not many can tell why are these lenses exclusively in white (while the other manufacturers can do it in both colors). Nope, it is not entirely for distinction although it somehow is commonly perceived this way ... there are more than meets the eye here. Nevertheless, this is NOT an important factor if you ask me ...
Now, IMHO, you can't go wrong with either Canon or Nikon, both companies provide excellent solutions for photographic community. The average photographer will have a helluva experience in either camp if he/she adopts the correct attitude in this art.
My advise to any would be adopters of either system is to ignore all the crap coming from fanboys from either camp and proceed straight to testing out the cameras and lenses, make sure you are comfortable with your choice, in ergonomics, feel and most importantly, its ability to perform what you need it to do. Like myself, my choice towards the Nikon system is never based on brand name but instead is the incapability of the Canon system to deliever the ergonomics and capabilities that I need the most. These are IMHO the most important factors to consider before taking the plunge.
Good luck to anyone in your purchases!