Hat Tip: Imaging Resource
There have been complaints about the Sony A7 and A7R allowing light to leak through the lens mount area. The amount of leakage is usually very small. The problem is usually only noticeable on lone exposures with a high ISO setting.
Sony is apparantly aware of the issue and is working on a fix.
There are steps Sony owners can take to address the problem, in the meantime. Simply cover the area between the metal flange and the orange gasket with something that blocks incoming light. The options for this are fairly inexpensive and will allow you to continue using you A7 or A7R until Sony issues on official fix.
Gaffer's tape apparently works. Make sure to use gaffer's tape and not masking tape. Gaffer's tape uses a different adhesive that won't leave sticky residue when removed.
Elastic items work. too. Thick rubber-bands have been used. (The kind used by grocery stores on produce items like broccoli.) Elastic hair bands have also been suggested.
The last link shows where you'll need to place the tape or elastic band.
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