This is an excptionally good lens for use underwater. It has the wide-angle perspective generally considered to be the best for undewater use. If your camera uses micro 4/3 lenses, and it fits into your underwater housing, it is a very good choice. Optical quality is excellent!

Easy To Use; Lightweight; Reliable; Underwater Use

"This is the most expensive lens I've bought for my E-P1 so far, but it's well worth the cost, especially if you can find it on sale. Olympus has pulled off an engineering miracle in creating such a compact ultra-wide zoom.

Unbelievably small size for the scene it covers. Contrast is good, detail is moderate (i.e. detail would begin to get fuzzy after approx two levels of zoom). This happens on most ultrawides and cropped sensors due to the span packed on a small space.

Been looking at an ultra wide lens that didn't break the bank to compliment my 12-40. At first I was a bit sceptical that 9mm would be wide enough but this ticks the boxes. Besides I can also use my square filters with it! A must buy.

While it's a shame that picture and sound quality haven't been upgraded, the iPhone 13 was great in these regards and the iPhone 14 is, too Excellent display Admirable headphone performance Solid build quality No upgrades to picture or sound Familiar design Notch is still present

Apple's latest non-Pro iPhone is superb - it's just that it's strikingly similar to last year's effort.

Still an incredible smartphone, Brilliant battery life gets a bit better, Excellent camera system gets a bit better

Last year’s Pro hardware, Wireless charging slow by modern standards, No USB-C; it’s now well overdue

Handling and features This compact ultra-wide angle zoom lens for Micro Four Thirds system cameras offers a 2x zoom range equivalent to an 18-36mm lens on a 35mm camera. It costs around ￡450 and sports a collapsible design.

Overall the 9-18mm is a winner for me. Its combination of compact size, low price, and good image quality make it an excellent choice for urban cityscape as well as nature landscape photogrpahy.

Excellent range of focal lengths Compact design Lightweight Good image quality Reasonable price Functions well with the Olympus E-P1 (w/adapter) Balances well with the entire Olympus/Panasonic range of cameras

Slightly slow (faster maximum aperture would be nice for street photography) Focusing could be faster (SWD would be cool) Concerns about long term durability in the field (probably not an issue; and heavier duty construction might add substantial weight

Especially at the smaller focal lengths, the corner sharpness remains behind the centre sharpness. This lens, like the Olympus 45 mm 1.8, is an inexpensive lens that offers first class optical performance: a very high resolution, low distortion and low vignetting.

Compact and light weight High optical quality: high resolution; low weight and limited distortion Large viewing angle Low price

Visible chromatic aberration Construction feels cheap

Especially at the smaller focal lengths, the corner sharpness remains behind the centre sharpness. This lens, like the Olympus 45 mm 1.8, is an inexpensive lens that offers first class optical performance: a very high resolution, low distortion and low vignetting.

Compact and light weight High optical quality: high resolution; low weight and limited distortion Large viewing angle Low price

Visible chromatic aberration Construction feels cheap