As we know for serious nature/birding, the minimum focal length is at least 300mm.
There are cases (eg. Sungei Buloh) that I always wish I have a longer reach. Hence I really need a teleconverter.
Getting a decent one in sg is rather hard. :sweat:
Have asked Tamron - doesn't have for Pentax mount
Sigma need to deposit to place order, cost abt $340+. However it will not work with AF & SDM.
Pentax 1.7x TC only available in Japan with a wide range of different prices up to $500++ :bigeyes:
Came across a used Tamron 1.4x TC once but missed the bid.
After much hunting, finally found Kenko 1.5x (support AF & SDM) brand new w/o warranty but also need to bid. ;p
For teleconverters, the higher the magnification the more light will lose out.
x2.0 will lose 2 stops of light
x1.7 will lose 1.5 stops of light
x1.5 will lose 1 stop of light
x1.4 will lose 1 stop of light
Means if I were to use the Kenko 1.5x TC on my DA*300 F4.0, it will becomes 450mm F5.6
Similarly 200mm F2.8 will effectively becomes 300mm F4.
Thus the Kenko 1.5x has a slight edge over the Tamron 1.4x (support AF & SDM) as both loses 1 stop of light but the Kenko after converted will be 450mm vs Tamron's 420mm. :lovegrin:
There are cases (eg. Sungei Buloh) that I always wish I have a longer reach. Hence I really need a teleconverter.
Getting a decent one in sg is rather hard. :sweat:
Have asked Tamron - doesn't have for Pentax mount
Sigma need to deposit to place order, cost abt $340+. However it will not work with AF & SDM.
Pentax 1.7x TC only available in Japan with a wide range of different prices up to $500++ :bigeyes:
Came across a used Tamron 1.4x TC once but missed the bid.
After much hunting, finally found Kenko 1.5x (support AF & SDM) brand new w/o warranty but also need to bid. ;p
For teleconverters, the higher the magnification the more light will lose out.
x2.0 will lose 2 stops of light
x1.7 will lose 1.5 stops of light
x1.5 will lose 1 stop of light
x1.4 will lose 1 stop of light
Means if I were to use the Kenko 1.5x TC on my DA*300 F4.0, it will becomes 450mm F5.6
Similarly 200mm F2.8 will effectively becomes 300mm F4.
Thus the Kenko 1.5x has a slight edge over the Tamron 1.4x (support AF & SDM) as both loses 1 stop of light but the Kenko after converted will be 450mm vs Tamron's 420mm. :lovegrin: