independent Posted March 9, 2021 Share Posted March 9, 2021 16 hours ago, TomTheDP said: What? Speedboosters effect DOF as well. Tom. You got DP in your name but the only depth of field that's affected is in your game. Focal reducers do not affect DOF. They reduce focal length and boost speed. Thus the descriptive names. They are not called depth-of-field reducers for reasons that have clearly been explained on the metabones website and of course, mathematically. If you check the DOF formula, the boosted f-stop is cancelled out by the reduction in focal length. Of course, this is also obvious in practice. You seem so sure of yourself...have you actually used them? If so, so why don't you put a 50 1.4 on your full frame camera and compare it with a speedboosted S35. The enhanced cropped sensor will display a similar field of view and depth of field, but the image will be exposed a stop brighter (f1.0). Quote Link to comment Share on other sites More sharing options...
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