7Artisans 4mm f/2.8 Fisheye

Not on this page? This site answers questions: try /ask/what-is-the-7artisans-4mm-f-2-8-fisheye-good-for, or write any question as words after /ask/.

Prime lens

A prime lens by 7Artisans for APS-C cameras, 4mm f/2.8. A 225-degree circular fisheye.

Maker	7Artisans
Focal length	4mm (prime)
Maximum aperture	f/2.8
Made for	APS-C sensors
Mounts	Sony E, Fujifilm X, Micro Four Thirds
Stabilised	no
Autofocus	no, manual focus

What it frames like

Its full-frame-equivalent focal length on the sensor it was made for.

How wide 4mm sees on each sensor it covers.

f/2.8 wide open, to scale against f/1.4.

On APS-C (Sony E, Fujifilm X): like 6mm on full frame; f/2.8 gives about the depth of field of f/4.2 there.
On Micro Four Thirds (Micro Four Thirds): like 8mm on full frame; f/2.8 gives about the depth of field of f/5.6 there.
On the larger-sensor bodies of Sony E: it works with the camera in a APS-C crop mode, at fewer megapixels.