I needed a custom flash for my K-50. Its TTL capabilities make work easier. In the photo below, I shot a candy for a friend's wedding. When it comes time to upgrade my camera body, I know this flash will be there. I've come to the conclusion that flashes and lenses should match manufacturers, it makes the integration seamless.
Canon 600EX RT Speedlite Flash Black
10 Review
10'' LED Ring Light With Tripod Stand & Phone Holder For Live Streaming/Photography, Dimmable Selfie Makeup Video Recording Light With 3 Modes & 10 Brightness Levels
13 Review
YONGNUO YN660 Speedlite: Versatile Wireless Manual Flash with GN66 Power for Canon Nikon Pentax Olympus
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Nissin I40S Camera Flash Black
9 Review