https://dslrbodies.com/lenses/nikon-lens-reviews/third-party-lens-reviews/two-15mm-manual-focus-choic.html
Two 15mm Manual Focus Lens Choices | DSLRBodies | Thom Hogan
Review of the Laowa 15mm f/4 macro and Irix 15mm f/2.4 Blackstone lenses
manual focuslens choicestwothomhogan