Because it uses fundamentally the same body as the rest of the VG series, the VG900 has the same physical E-mount.
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E-to-A-mount adapter
In order to use A-mount lenses that can take advantage of the entire sensor, you have to use the bundled LA-EA3 adapter.
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Connectors
The HDMI and USB connectors sit under the grip.
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Zoom switch
The top zoom switch can be used in conjunction with the new 18-200mm f3.5-6.3 or 16-50mm f3.5-5.6 E-mount power zoom lenses.
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More connectors
The usual suspects.
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Same as its siblings
As with its sibling models, the VG900 has some basic direct-access control under the LCD and is limited to a single SDXC card slot.
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More direct-access controls
This is one of the aspects in which the VG900 differs from the lower-end VG models -- a more shooter-friendly location and operation for the manual exposure controls.
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Built-in microphone
The VG900 uses the same Quad-Capsule Spatial Array microphone as the rest of the VG series.