Rokinon 10mm F2.8 for Canon with speedbooster

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DrA
DrA Regular Member • Posts: 221
Rokinon 10mm F2.8 for Canon with speedbooster

will Rokinon 10mm F2.8 for Canon (16mm equivalent on my APSC) with speedbooster for Sony E mount reduce the focal length? Considering the possible vignetting, what is the effective equivalent? will it become 6mm F.2.0 ( 9mm equivalent)? I wish. If the lens was designed for FF, maybe.

 DrA's gear list:DrA's gear list
Sony Alpha NEX-6 Canon EF 85mm f/1.8 USM Canon EF 28-135mm F3.5-5.6 IS USM Sony E 55-210mm F4.5-6.3 OSS Samyang 8mm F2.8 UMC Fisheye +5 more
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