Shadow using flash - only shows at high iso

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SUFTUM Regular Member • Posts: 221
Shadow using flash - only shows at high iso

playing with settings tonight - noticed that at high iso a small even shadow along top of image appears.

Any ideas on the cause? Only starts around 800 and gets worse the higher I go. D750 set to 1/250 FP sync and sb910 on TTL

 SUFTUM's gear list:SUFTUM's gear list
Nikon AF-S Nikkor 24-120mm F4G ED VR Nikon D750 Nikon AF-S Nikkor 70-200mm f/2.8G ED VR II Nikon AF-S Teleconverter TC-14E II Nikon AF-S Nikkor 50mm f/1.8G +9 more
Nikon D750
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