The RX100 VA introduced an increased image buffer, burst shooting up to 24fps, and customizable menus. This is excellent for photographers seeking to capture quick pelagic animals that need good burst speed and more processing power. The RX100 VA still carries all of the advantages of the RX100 V including the 315 point phase detection autofocus system and the 20 MP/1" Exmor RS BSI CMOS sensor. The main advantage of the RX100 VA over the VI is that the RX100 VA is able to shoot with both macro and wide-angle wet lenses on the same dive. This is because the lens is shorter and has less zoom capability than the RX100 VI. You also don't need to purchase additional ports/adapters for dedicated wide angle and macro set ups.
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Now, as mentioned previously, the 4K Video Type is an important factor to consider as well. In order to record 4K 60p, the Panasonic S1 crops the sensor to a APS-C sensor at 4:2:0 8-bit. Although this is not as impressive as the Full Frame 4K 60p recording available with the Canon 1DX MkII, it is still a leap forward in full frame mirrorless technology and a particularly favorable feature.