to some degree this is already available on a Leaf back. My feeling is ... if you are used to the LCD on the Leaf... you can actually use it to check focus. Not entirely sure about it, though... would require to actually work with a Leaf for some time.Outside of the 80mp+ sensor with even better DR, I am hoping for:
- some way to 100% check focus on the back, even if its just a central spot area. i.e. on screen live view, even briefly.
- which requires a better screen
Working with a tech camera I actually tend to prefer a Leaf back as it provides some very nice features on the LCD... like movable grid lines (comes in hand when shooting architecture or so) and you can log custom data, for instance lens data, that are available in the metadata of the RAW files afterwards.
As to tethering in the field I prefer to power the back from the internal battery of the back (it's easier to carry some more batteries for the back than an external power device for the laptop). This is not possible on the Leaf as you have to detach the battery to plug the FW cable. But this is minor to me personally as I actually very rarely tether in the field.
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