If you are wondering whether you should get a fast lens or a lens with VR (Vibration Reduction), here's my take: In overall, VR does help a lot (as it will reduce camera shake) and will produce better/sharper picture than equivalent lens without VR (especially if the object is static). If the object is moving (sports/action) then VR feature alone might not help (depending on how fast the object is moving and how much light is available), and a fast lens often end up being a far better solution, even without VR feature as it will allow much faster shutter speed to freeze motion. Using tripod (and a remote) will substitute for the need of VR feature. In general I would recommend getting a fast lens with VR feature (and usually it is expensive) such as the 70-200 f/2.8 VR, but if one can only get for one or the other, then find out what do you want to use the lens for and then use the guideline mentioned here.
If you are wondering whether you will get the benefit of buying f/1.4 lens over a f/1.8 lens, just remember that the f/1.4 lens is about 60% faster than f/1.8 at its widest aperture setting. With this information, you can decide if the additional speed will justify the additional cost. The bokeh is nicer as well in f/1.4 lens but I think speed is usually the main factor in deciding whether to get the more expensive f/1.4 lens.
Here are the summary of pros and cons for this Nikon 50mm f/1.4D AF lens:
Pros:
1. Very fast (f/1.4)
2. Very sharp pictures (especially when stopped down to f/2 or more. very sharp at f/2.8)
3. Great for sport/action photography
4. Great for indoor and low light situation
5. Great for portrait
6. Bokeh is almost as good as many expensive Nikon tele-lens
7. Fast autofocus
8. Perfect for wedding photography (or no-flash event). However, or try the 17-35mm f/2.8 or 28-70mm f/2.8 lens)
9. 75mm equivalent which can be considered a short tele lens (I actually like the fact that it's 75mm equivalent vs 50mm in DSLR. if you need more zoom, you can get the Nikon 85mm f/1.8, or the 70-200mm f/2.8 VR). If you have full frame DSLR(like the D3 or D700), then this #9 pros is not applicable.
10. Sharper than its 50mm f/1.8 sibling (at equivalent aperture)
Cons:
1. Being prime lens, you need to move your feet a lot to adjust/compose
2. Some distortion at widest aperture
3. Plasticy build (though it has metal moount and internal part seems to be from metal)
4. Autofocus is not the most silent but very reasonable
5. 75mm equivalent with 1.5x multiplier on non full frame DSLR (many people find this is an odd range for normal lens. I actually like it). If you have full frame DSLR(like the D3 or D700), then this #5 cons is not applicable.
6. Autofocus does not work with D40, D40x and D60. The newer 50mm f/1.4G AF-S lens will autofocus with those cameras.
Bottom line: This lens is so versatile that I think everyone should own (either the 50mm f/1.4 or the 50mm f/1.8) in addition to all the lenses that they already have. Being a very fast lens, it enables me to take pictures in low light (sport/action photography) that I otherwise wouldn't be able to do.
Again, I would recommend everyone to get this lens (or the 50mm f/1.8). In some ways I can say that this lens will make you a better photographer.
Happy Photographing!
More Detail : http://www.amazon.com/exec/obidos/ASIN/B00005LENO/tipfla-20
More Review : http://camera.babybi.com/detail.php?id_detail=35
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