Photo By: Hafizan Abd Rais
Camera: Canon EOS 550D
Contact: 012-3479281
26 March 2011
15 March 2011
THE F/2.8 LENSES
1. Basically there are 2 types of lenses.
1.1 Fixed focal length lenses (35mm, 50mm, 135mm etc).
1.2 Zoom lenses (18-55mm, 35-135mm, 70-200mm etc).
2. All lenses from #1.1 will have a constant maximum aperture
(since the focal length is fixed).
3. Lenses from #1.2 will have 2 sub-categories.
3.1 Having a constant maximum aperture (through out the
entire Zoom range).
3.2 Having a maximum aperture (f/3.5) at the short end of
the zoom range but gradually the maximum aperture becomes "smaller"
(f/5.6) when you shift to the long end of the zoom range.
4. Lenses from #3.1 usually have better optics & perform well in
low light conditions AND are more expensive. High quality & pro lenses
usually fall into this category.
5. Lenses from #3.2 are more main stream (like kit lenses), made
from cheaper materials. Optics can (but not always) match those from
#3.1 but with a trade-off; the max aperture is always "smaller" at the
long end of the zoom range. Lenses like these always perform poorly in
low light conditions AND are so much cheaper.
There are 3 versions of this f/2.8 lens from Tamron.
1. Non-motorized/non-VC (old version).
2. Motorized/non-VC (quoted by Selangor for RM 1,200-00).
3. Motorized/VC (quoted by Selangor for RM 1,580-00).
John Khoo
14 March 2011
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