Автор: Amigo
Дата: 24-12-09 21:30
didesignbg
Дата: 24-12-09 18:04
Важно е да знаеш, че ако ще го ползваш за портрети, при близки разстояния 70-200вр ІІ става около 130 мм
130 чак не е, ама не е 200 при всички положения. ![[smilie8]](https://photo-forum.net/forum/smileys/smilie8.gif) Таман днес го пробвах във фотосинтезиса именно поради това, което прочетох из мненията на западняците по тамошните форуми и онлайн магазини. И направих импровизирано сравнение между сигмата 100-300 и 70-200 ВР 2 на 100 и 200 мм, и разлика определено има. Иначе обективът ми се струва трепач, но това трябва да се има предвид. Ето какво пишат някои:
For FX users who already have the VR1, you will need to gauge whether the advantages will be worth the cost of getting this lens. If you need to shoot at this lens maximum focal length of 200mm, the lower magnification or the shorter "effective focal length in terms of field of view" when shooting at near range may be a major concern for you. This is specially a concern for events or wedding photographers. Note however that some photographers have adapted to this and actually found it helpful that the magnification remain near constant which minimizes the need to zoom out as the photographer approaches a subject or when the subject gets closer to the photographer. For some photographers, the reduced magnification when shooting at closer range is thus something that one can adapt to and take advantage of. It would still be best however to try the lens first and see how this impacts on your shooting style.
With regard to the issue of a shorter effective reach when shooting at near ranges, this should not be an issue with DX due to the 1.5X field of view of the APS-C sensor. If anything, it may even be an advantage when shooting up close.
EDIT: This may be a concern for some photographers (whether FX or DX) who need to shoot their subjects up-close at 200mm focal length for maximum reach. So I thought I'd post this info here:
Distance of subject / Effective focal length in field of view of the Nikon VR2 at 200mm
(Nikon 70-200mm VR2 at 200mm compared against a Nikon 200mm prime/fixed focal length lens)
1.27m ............... 128mm
1.40m ............... 132mm
2.00m ............... 147mm
3.00m ............... 164mm
5.00m ............... 176mm
10.0m ............... 186mm
THE ADVANTAGES OF THIS LENS OVER THE VR1
1. Sharp corners on FX and DX, even when shooting wide-open at f/2.8
2. Less vignetting on FX and DX when shooting wide-open at f/2.8 (vignetting on DX at f/2.8 now irrelevant)
3. 1-stop improvement in VR (1-stop improvement really makes a big difference when shooting at 135-200mm).
4. Improvement in the bokeh compared to the VR1
5. Improvement in color and contrast, specially when shooting backlit subjects against the sun
6. More resistant to lens flaring (due to nano-coating)
7. Shorter more compact length makes it easier to pack, carry and use in crowded spaces
(the lens and the hood of the VR2 are both shorter than the lens and hood of the VR1)
THE DISADVANTAGES OF THIS LENS OVER THE VR1
1. More expensive than VR1
2. Slightly heavier than VR1
3. Not as good as the VR1 when used with teleconverters in DX bodies for long reach
4. Shorter reach or magnification than the VR1 when shooting at close range
(e.g., shooting at 200mm focal length is equivalent to 164mm when shooting from 10 feet away)
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