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That people would recommend the f/1,4 over the f/1,8 for speed reasons is not related to the sensor size. The f/1,4 lens is simply faster than the f/1,8 (as discussed hereas discussed here) regardless of the size of the sensor.

However, a smaller sensor results in a greater depth of field at a given aperture. For this reason it could make sense to recommend a larger-aperture lens for a smaller sensor.

That people would recommend the f/1,4 over the f/1,8 for speed reasons is not related to the sensor size. The f/1,4 lens is simply faster than the f/1,8 (as discussed here) regardless of the size of the sensor.

However, a smaller sensor results in a greater depth of field at a given aperture. For this reason it could make sense to recommend a larger-aperture lens for a smaller sensor.

That people would recommend the f/1,4 over the f/1,8 for speed reasons is not related to the sensor size. The f/1,4 lens is simply faster than the f/1,8 (as discussed here) regardless of the size of the sensor.

However, a smaller sensor results in a greater depth of field at a given aperture. For this reason it could make sense to recommend a larger-aperture lens for a smaller sensor.

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Fredrik Mörk
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That people would recommend the f/1,4 over the f/1,8 for speed reasons is not related to the sensor size. The f/1,4 lens is simply faster than the f/1,8 (as discussed here) regardless of the size of the sensor.

However, a smaller sensor results in a greater depth of field at a given aperture. For this reason it could make sense to recommend a larger-aperture lens for a smaller sensor.