BlackMagic Intensity Pro is what I use... $199 I paid for it. This link is to the latest version that includes 4K and the price is still reasonable. You can buy cheaper for sure, but the difference will be made up on issues you will have with a non-BM card and support.
https://www.blackmagicdesign.com/pro...intensitypro4k
The price is right for this quality.
Check out Blackmagic... they specialize in video, they aren't a onsy twosy company.
https://www.blackmagicdesign.com/products
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