The f1.7 is sharper at wider than f4. If I am correct, the f1.4 has 8
aperture blades while the f1.7 has 5.
regards,
Alan Chan
>I propose to buy a 50mm lens for general purpose. Would you give me any
>opinion on the f/1.4 and f/1.7 lens?
>
>In reality, I seldom use the aperture larger than f/2.0. So the f/1.4 and
>f/1.7 have no difference for me. Rather, I wish to choose an optically good
>lens.
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