TTartisan 7.5mm f/2 Lens

For my birthday recently, I bought myself an AstrHori 10mm f/8 lens for my camera -- which is to say, a fisheye lens. But I traded it in for a TTartisan 7.5mm f/2 lens, which is almost as extreme as it gets (a sample photo on the right). Here are my very brief observations:

• Field of view is given as a full 180°
• The focus is good both centre and corners

• f/2 enables one to take photos in very low light

• In spite of being ultra wide, it obtains good bokeh

• With the camera's MF Assist, manual focus is easy

• There is a lot of glass in there; the lens does have a tint

• Vignetting is minimal, usually negligible

• Camera flare and ghosting are minimal

• The price is very low, compared e.g. to the Fuji 8mm

OBSERVATION: One can defisheye if desired. An equirectangular perspective keeps the top, bottom, and sides of the photo within bounds, and straightens the photo out, mostly. A rectilinear perspective is possible, but seems to stretch a photo too much in the corners. The lens can take some stunning photos -- but fisheye photography is an art. I found that the best photos were ones I didn't expect to be the best. I took the photo of a friend.

POSTSCRIPT: the first mass-produced fisheye lens, made by Nikon, cost $27,000 in 1957. Fast-forward to the TTartisan, and the cost is now below $140. In fact the AstrHori is below $80.