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Hello, Which specific lens were you using? If you were using an APSC “crop sensor” Sony lens on this camera, this would be why you’re getting shadows in the corners of your images. The Sony A7iii is a full frame camera, and is meant for full frame E-mount lenses that fully fit its sensor. APSC lenses don’t fit perfectly with the full frame sensor, and will cause shadows in the corner of your image, known as “vignetting”.
Sorry, there was a problem. Please try again later.Hi kmin, please check if the lens profile setting is applied so that it removes vignetting or dark corners in the picture. MENU → (Camera Settings1) → [Lens Comp.] → desired setting. Make sure each settings are set to AUTO.
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![Sony - Alpha 7 III Mirrorless [Video] Camera with FE 28-70 mm F3.5-5.6 OSS Lens - Black-Front_Standard](https://pisces.bbystatic.com/prescaled/500/500/image2/BestBuy_US/images/products/6213/6213100_sd.jpg;maxHeight=100;maxWidth=60)