Tele Converter Lens
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Sigma Lens with sigma tele converter ?
i have canon 450D with sigma 70-300 APO. i love bird photography, with this i am trying to take some considerable pics of birds. and i have taken some good pics also. now i need some more range to take some more good shots. i have two options.
first i have to wait to fill up my pocket to buy some long tele which are almost impossible to buy and second temporary to buy tele converter.
i have questioned here before but i haven't got satisfactory answer at all. i want to buy sigma 1.4 x tele converter and i will attach that on sigma 70-300 APO my questions are.
1 ) how many f-stop i will loose if i use these 1.4 x converter ?
2 ) canon 450D has 1.6 x crop factor so as per my calculation with this tele converter i will get 300 mm x 1.6 = 480 x 1.4 = 672 mm.
my calculation is right or wrong ?
any good suggestions would be appreciated.
I would sell that zoom and invest in a 300mm F/4 prime and a Canon teleconverter when you are able. You WILL see a difference in quality. Especially regarding contrast.
The math is almost irrelevant, you simply will not like the images that a zoom produces with a teleconverter.
Make image quality a priority.
According to Sigma you will have a ONE STOP reduction with a 1.4 teleconverter:
"Using the APO Tele Converter EX decreases the effective aperture by one F-stop (with 1.4x Tele Converter) or by two F-stops (with 2x Tele Converter).Regardless of exposure mode, correct exposure can be obtained."
In answer to your questions:
* You will have a one stop reduction with a 1.4x teleconverter. Which means zoomed out to 300mm you will have a very slow lens of F/6.6! Yikes.
* Your math on the crop factor is right.
j
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