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One thing you haven't mentioned is what type of images you will be shooting. Your subject matter plays an important role in what lenses you should choose. You also haven't mentioned what your skill level is. Providing this info will help others provide the correct recommendations.
I mostly shoot in this few categories;
landscapes, sceneries, buildings. (Generally far away shots).
Long (night) exposure shots for landscapes, lighted buildings, and macros (of stationary objects) as well. (Long exposure category).
I shoot indoors without flash most of the time and I use high ISO a lot. (Besides that, my shots are still blurred outsometimes). I will also be shooting concert shots and action shots in the near future (When the end of the year events come).
Finally, Iphotograph people and portraits and this is my new category that I plan to build uponin the long run.
I also have one last special category;
In my country, the sun is always very bright and I will always be encountering it when I leave for outdoor activities. My Sony DSC-N1 compact cannot handle such a bright situation when it has been set to F2.8 aperture since the 1/1000 max shutter is often not fast enough. So, I also shoot a lot in bright sunshines.

In fact, generally all my shots will be affected save the nightime ortwilight ones.
I am a beginner.
Hope all this helps.
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Yeah 50mm * 1.5 or 1.6 = 75 or 80mm equivalent. That's really a short telephoto.
As your only lens it sounds like a bad idea to me, you really don't know what kind of photography you're going to like as you're (no disrespect intended) a complete beginner.
If you've got your heart set on starting with a prime then a lens in the 24-35mm range would be much better for you.
The Sigma 30mm f1.4 is very highly regarded.
Either the Nikon or the Canon will be fine. The DOF preview button is pretty much useless on the small viewfinder of the Canon. You think you need it, but you don't. I bet you'd never use it if you had it.
Thanks for your advice.
My budget is currently set at $900 US. How will I manage the Sigma 30mm f1.4 with anx dSLR body? 8)
Thanks for informing me about the DOF button's usefulness. I think I should be able to go without it if it is so unecessary. (I innitially thought is was important).
Thanks once again and more advices would be most appreciated from all of you! Btw, if you need more infos about my criteria, feel free to ask. 8)
Regards.
Sorry: (Thread EDIT);
I just read a review of the Sigma AF 30mm f/1.4 EX HSM DC>>>
http://www.photozone.de/8Reviews/len...0_14/index.htm
It isn't so good what do you think? Considering that is cost a hefty
$425.00 for me!
Wouldn't it be a better idea for me to get the Nikon D70s with the F1.8 Nikkor (50mm prime)? (It has a fairly positive review and great image quality>>>
http://www.photozone.de/8Reviews/len...0_18/index.htm). I can get another lens by this year end if I pass my exam! :-)
Btw, I forgot to mention that I also capture images in B & W...some black and white filter effects would be nice! I also capture macros. (I am using the Sony N1).
I don't expect macros in the dSLR world without more $$$$s. However, I don't mind compromisingtowards the potrait range because I like the soft background focus (Like macros). Anyway, the Nikon D50 and D70s doesn't have B & W mode I think...talk about filters...
The OLYMPUS EVOLT E-500 dSLR and the Canon EOS 350D has B&W + B&W filters andtones etc...! Nonetheless, I like theD50 and D70sa lot.

(DSC-R1?)