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Cai Le Dao

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  1. I think I understand that if the camera is in mechanical shutter mode then the sensor is exposed as described by the slot between front and back curtains. The sensor retains the image electronic charges until read. That is scanned sequentially by the read process. But at say 1/2000 of a second the sensor is exposed for 0.0005 S. I don't understand the mechanism that does this in ES mode. Whatever mechanism that does this it introduces the rolling shutter. I understand what rolling shutter is, but given the fast pace I don't really get why something exposing the sensor in a sequential manner for 1/2000 of a second produces a different result to a mechanical shutter. At these speeds a mechanical shutter is moving really fast so a very narrow slot of light is scanned across the sensor, very like a sequential read. I had thought that the speed of the electronic shutter would be the read speed for the sequential scan of the sensor but that can't be. The good news is that in portrait orientation the effect disappears and bird and reflection align. So I have a viable workaround.
  2. ES mode : I was photographing Kingfishers this weekend and wanted the 20frames/sec ES mode gives as the birds dive really quickly so frame rate matters. Got some great images however the one attached is an example of a challenge. The birds wings are backwards, in the reflection they are forward's. So on seeing this a quick google highlights that Fuji do not recommend ES mode for fast moving objects so fair play its a known limitation. What I don't understand is why using the mechanical shutter would remove the scan delays. This image was taken at 1/2000 sec, images shot in portrait mode don't have the rolling shutter effect. Also images shot at 1/8000 are pretty good. Overall I am happy this is a fairly narrow use case and the images stand up well against the fellow shooters using Canon 1DX mark 2 which shoot at a lower FPS. Does anyone know if the scan times are different when using the mechanical shutter. I think the best option is to use Portrait mode, the dive in was fairly predictable where the bird emerged was slightly more variable and landscape orientation gives a little more flexibility. 20FPS by the way generally gives a shot with the bird emerging from the water, one just clear and sometimes a third before it disappears out of frame. the DSLR's at 12FPS only really got one, so the issue of the reflection isn't show stopper. It may be worth mentioning that I don't have photoshop and this is an export of a raw file default profile through Capture 1 so not really post processed. XT-3 50-140 F2.8 lens at about 120mm F5.6 and 1/2000 awesome ISO 10000
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