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If we get the Metabones Ultra Speedbooster this may be the most epic drop ever.
Thanks for the reply! My understanding is that most MFT cameras (at least Lumix) can still shoot 4K on APS-C lenses with the XL. But yes, if you shoot stills with an APS-C and an XL, you'll get vignetting.
I'm curious why people are voting for the 0.71x over the 0.64x. The 2x crop factor is a major limitation of MFT cameras, and the 0.64x adapter really helps bring canon lenses closer to their "35mm equivalent" focal length.
Denemark
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The XL version is only compatible with full frame lenses while the ULTRA version can use both crop and full frame. While the extra room you get with the XL is really helpful, especially when using a camera that crops in when shooting 4k, losing the ability to use the much cheaper aps-c lenses is a deal breaker for most people. Full frame lenses are usually more expensive and much larger as well.