Samyang 8mm f/3.5 Aspherical IF MC - Fisheye

Also knows as: Falcon, Polar, Opteka, Rokinon, Vivitar, Bower, Walimex Pro.

The best entry point fisheye lens on the market.
It is a fully manual lens. The real focal length is closer to 9mm, but the various
rebrandings declare it a 6.5mm, 7mm or 8mm.

Number of pictures required for a 360° panorama:

• Minimum (full-frame): 3 images every 120° at 0° pitch
• Minimum (1.5x, 1.6x): 4 images every 90° at -15° pitch and a zenith image at +90° pitch (or +60°, for better overlap when generating control points)
• Recommended: (1.5x, 1.6x): 5 or 6 images, every 72° or 60° at -15° pitch, with double zenith shots at +60° pitch (opposed)

Based on information courtesy of Omnipix, more detailed discussion and sample images: link.

Thourough review, sample images and extensive tests by Michel Thoby, here.

Samyang 14mm f/2.8 ED AS IF UMC - Rectilinear

The Samyang 14mm is a fully manual lens. The sharpest aperture is f/5.6.

Field of view (FOV) - horizontal, vertical, diagonal:

• Full-frame=14mm, HFOV: 104° | VFOV: 81° | DFOV: 114°
• 1.5x=21mm, HFOV: 81° | VFOV: 59° | DFOV: 92°
• 1.6x=21mm, HFOV: 78° | VFOV: 56.6° | DFOV: 88.5°

Number of pictures required for a 360° panorama:

• Minimum (full-frame): N, 6 images every 60° at 0° pitch, zenith at +90° (method by Michel Thoby)
• Recommended (full-frame): N, 6 images every 60° at -30° pitch, 6 images every 60° at +30° pitch, zenith at +90° pitch
• Minimum: (1.5x, 1.6x): N, 8 images every 45° at -30° pitch, 8 images every 45° at +30° pitch, zenith at +90° pitch

Stitched panorama, along with sample images and a PTGui project available at 360tacticalvr.

Lens review by LensTip.com.