![]() ![]() I’m thinking you won’t notice any real differences between the two lenses in this regard. On the other hand the impact of any camera shake will be slightly less visible with the 40mm compared the 50mm as it is a somewhat wider angle less. E.g., 1/40th of a second exposure with the 40mm f/2 translates to about 1/50th of a second with the 50mm f1.8, all else being equal. Increases risk of camera shake being visible slightly. This may matter a little if you are doing a lot of shooting at night with somewhat longer exposures. This means the 40mm f/2 lets in about 23% less light and will therefore require a shutter speed that’s 23% longer than the 50mm f/1.8 for the same exposure (when both lenses are wide open that is). The 40mm f2 is one 1/3rd of a stop slower than the 50mm f/1.8. Meaning that if you are using borderline shutter speeds (where some camera shake or motion blur starts to creep in), sharpness of the image is no longer limited/determined by the quality of the lens but by these other sources of blur (that's why some people say that to make the most out of a high-res sensor with a high-res lens, you need to use very fast shutter speeds or a tripod).īasilG answered the shutter speed question above in one way. Shutter speed doesn't really affect *lens* sharpness but *image* sharpness. And im not sure what you mean in terms of shutter speed affecting lens sharpness (nooby just learning this stuff) It would be walkaround city stuff at night, nothing too high in iso department. When you say night/street, does that mean that you will be shooting wide open at high ISO a lot (advantage 50/1.8)? Do you usually achieve shutter speeds where lens sharpness differences really matter (advantage 50/1.8), or is it more borderline where slight motion blur already softens the images (drawbacks of the 40 become less relevant)? ![]()
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