Laowa 4mm F2.8 Fisheye
Fujifilm X
Venus Optics Laowa 4mm F2.8 Fisheye

About

This is a cropped frame Fujifilm X mount lens introduced by Venus Optics 6 years ago. Its focal length is 6mm FFE with an aperture of ƒ/2.8. You can find a review of it on DPReview.

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Used
Starting at $118
KEH is American and has slightly higher grading standards, while MPB is originally from the UK. Both are global leaders in used lens trading.