The Olympus 12mm f/2 is a premium quality prime lens for the micro 4/3rds system.
It has excellent quality construction – mainly metal – and offers a nifty pull back ‘snap-focus’ manual focus ring. Singly pull back on the focus ring to switch to manual.
The lens is very compact and lightweight and though no lens hood is provided with the lens the resistance to flare is excellent so it doesn’t really need a hood.
Optical performance is excellent with sharp images available from full aperture. Centre performance is excellent at f/2 and stopped down from there, with edge performance starting at a very good level and improving on stopping down. Peak performance is around f/4/5.6 with performance beyond f/5.6 starting to suffer from diffraction.
12mm in micro 4/3rds equates to 24mm in 35mm terms so a nice wide-angle but not too wide. Combined with a micro 4/3rds body with in-body stabilisation this makes an excellent low light tool as hand held images at very low speeds can be taken while still retaining reasonable depth of field.
Used close to your subject at f/2 nice out of focus backgrounds can be produced.
So, the 12mm f/2 lives up to its premium price and comes highly recommended if a fixed 24mm equivalent lens is up your street!