The foam absorbs the sound & Vibrations of the slap of the shutter. Just like grip accessories help absorb the shutter vibrations for long exposures. I didn't think such simple wrap and foam would stop so much noise, but it I was able to silence the camera a lot. If you don't like wrapping up the camera just using foam and engulfing the a7R in your overcoat at waste level should be enough to deaden the hard slap of the shutter for street photography too.
052F/044G/44P) Sony DSLR-A700 w/Tamron 18-250mm F3.5-6.3 @ 60.00 (90.00mm) [304], 1/1600 @ F5.00, ISO200; flash code: 0; 4272W x 2848H; exposed: 13-May-2008 10:05:14; GPS: 37.273600, -76.700272; zip: 23185; alt: 69ft/21m
015F/019G/019P) Sony DSLR-A700 w/Tamron 18-250mm F3.5-6.3 @ 75.00 (112.50mm) [304], 1/640 @ F8.00, ISO200; flash code: 0; 2795W x 1865H; exposed: 13-May-2008 14:37:53; GPS: 37.273053, -76.702092; zip: 23185; alt: 79ft/24m
448G) Sony ILCA-77M2 w/Tamron 16-300mm F3.5-6.3 @ 50.00 (75.00mm) [510], 1/80 @ F10.00, ISO250; flash code: 0; 6000W x 3376H; exposed: 11-Oct-2015 15:46:56; GPS: 37.272778, -76.697500; zip: 23185; alt: 79ft/24m
000F/000P) Sony DSLR-A700 w/Tamron 18-250mm F3.5-6.3 @ 40 (60.00mm) [304], 1/60 @ F16.00, ISO640; flash code: 0; exposed: 15-May-2008 11:12:30, GPS: 37.273808, -76.702054; zip: 23185; alt: 78ft/24m
360F/209G/209P) Sony DSLR-A700 w/Sony 18-250mm F3.5-6.3 @ 18.0 (27.0mm) [309], 1/15 sec @ F6.30, ISO200, flash code: 0; 4272W x 2848H; exposed: 28-Sep-2011 15:25:15; GPS: 41.955561, -70.662794; zip: 02360; alt: 8.9ft/3m
379F/179G/179P) Sony DSLR-A700 w/Zeiss 16-80mm F3.5-4.5 @ 80.00 (120.00mm) [308], 1/400 @ F9.00, ISO400; flash code: 0; 4156W x 2771H; exposed: 29-Sep-2011 16:54:37; GPS: 41.767447, -70.483261; zip: 02563; alt: 13ft/4m
000F/000G/000P) Sony DSLR-A700 w/Zeiss 16-80mm F3.5-4.5 @ 30.0 (45.0mm) [308], 1/125 sec @ F7.10, ISO200, flash code: 0; 4272W x 2848H; exposed: 03-Oct-2011 13:04:01; GPS: 42.107504, -72.098968; zip: 01566; alt: 596.5ft/182m
479G) Sony DSLR-A700 w/Zeiss 16-80mm F3.5-4.5 @ 80.00 (120.00mm) [308], 1/30 @ F13.00, ISO100; flash code: 0; 4272W x 2848H; exposed: 30-Sep-2011 17:12:32; GPS: 41.671111, -69.948889; zip: 02633; alt: 21ft/6m
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