If you are looking for another camera to work along with your main camera, Sony offers 3 smaller cameras to choose from - the FS7, RX10 or a7S models. Here are the specs:
Specs for the RX10
Imaging
Pixels
Actual: 21 Megapixel
Effective: 20.2 Megapixel
Sensor
1.0" (13.2 x 8.8 mm) CMOS
File Formats
Still Images: JPEG, RAW
Movies: MP4, MPEG-4 AVC/H.264, MPEG-4 AVCHD, XAVC S
Audio: AAC LC, AC3, Dolby Digital 2ch, Linear PCM
Max Resolution
20 MP: 5472 x 3648
Aspect Ratio
1:1, 3:2, 4:3, 16:9
Image Stabilization
Optical
Color Spaces
sRGB, Adobe RGB
Optics
Lens
Carl Zeiss Vario-Sonnar, 14 elements in 11 groups
7 Aspherical
EFL: 8.8-73.3mm (35 mm equivalent: 24-200mm)
Aperture: f/2.8
Filter Thread
62mm
Zoom
Optical: 8.3x
Clear Image Zoom: 16x
Digital: 33x
Focus Range
Wide: 1.18" (3 cm) - Infinity
Telephoto: 9.84" (25 cm) - Infinity
Exposure Control
ISO Sensitivity
Auto, 100-12800 (Extended Mode: 64-25600)
Shutter
Type: Mechanical
Speed: 4 - 1/3200 seconds in Auto Mode
Type: Mechanical
Speed: 30 - 1/3200 seconds in Program Mode
Type: Mechanical
Speed: 30 - 1/3200 seconds in Bulb Mode
Type: Mechanical
Speed: 30 - 1/3200 seconds in Aperture Priority Mode
Type: Mechanical
Speed: 30 - 1/3200 seconds in Shutter Priority Mode
Type: Electronic
Speed: 4 - 1/32000 seconds in Auto Mode
Type: Electronic
Speed: 30 - 1/32000 seconds in Program Mode
Type: Electronic
Speed: 30...