Checking out the Viltrox Nikon F to MFT speedbooster adapter with the Sigma 18-35mm f1.8.

This adapter is only ~$83USD vs something like a Metabones speedbooster & definitely think that while it does have a few quirks like clicking aperture it's certainly worth your money.

Edge sharpness is slightly sacrificed, but you're gaining a much wider FOV & an additional stop of light for a mere $83.

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