Overview

Description by Panasonic:

The LUMIX G 20mm / F1.7 ASPH., a pancake interchangeable lens, is based on the Micro Four Thirds System standard. It features a compactness and light weight despite its F1.7 brightness allowing a beautiful soft focus for photos to be even more impressive.

Panasonic Lumix G 20mm f/1.7 ASPH VS 30mm f/2.8 EX DN Lens sharpness comparison by Fredrik Gløckner

From my own findings, there's the issue of Sigma's much lower CA and purple fringing when used on Olympus bodies. In any case, the Sigma is an automatic buy anyway, due to its current very low price.

"We see that the Lumix G 20mm f/1.7 has an impressive level of sharpness, even wide open. The Sigma 19mm, on the other hand, needs a bit of stopping down before reaching the same level of sharpness. At f/2.8, the 19mm lens is a tad bit dull, even in the centre of the image frame. This finding is consistent with other tests I have seen. Generally, it is observed that the Sigma 19mm lens is not the sharpest at f/2.8, and improves when stopped down to f/4 and f/5.6. Stopping down beyond f/5.6 does generally not add anything to the overall sharpness, but does give you more depth of focus (DoF). If you need a deep DoF, it may still be wise to stop down to f/8 or even further, but this will give you slightly worse sharpness at pixel level.

. . . read more

Olympus M.zuiko 17mm f/1.8 VS 17mm f2.8 VS Panasonic 20mm f1.7 ASPH review by Ming Thein: We're not there yet, but it is a good start.

"That leaves us with the three native AF options. I would not buy the 17/2.8 unless size is a critical priority, or you know that you’re going to be shooting only static objects stopped down; otherwise the slow AF speed will drive you crazy. The Panasonic 20/1.7 is in a similar boat; it’s faster to focus than the 17/2.8 and optically better, but nowhere near as fast as the 17/1.8. The 20/1.7 and 17/1.8 deliver similar resolution in the center, but they render quite differently – the 20/1.7 is . . . read more

Roger Cicala goes Grey's Anatomy on the Panasonic Pancaces

Today i learned there is a giant spring inside the Panasonic 20mm lens:

"The spring has something to do with the fact that the lens assembly extends for close focusing. Whether it helps the motor move the lens, or the motor only moves the lens back and the spring moves it forward, I can’t say. But if you put the lens back together without the spring, it doesn’t focus. (Pretty simple way to figure it out, huh?)" . . . read more

Panasonic Lumix G 20mm f/1.7 ASPH at olympuslensreview

"This Panasonic 20mm is one of Micro Four Thirds best prime lens, much better than the Olympus 17mm.

You can get this lens from either Amazon (Best Price + FREE Shipping), B&H Photo Video or Adorama.
I like this lens primarily because of its small dimension (hence the name pancake) and superior optical quality compared to Olympus 17mm.

On the center, this lens is sharp at tack,

. . . read more

Panasonic Lumix G 20mm F1.7 ASPH Lens Review @ DPreview

"The Panasonic Lumix G 20mm F1.7 ASPH was announced earlier this month as the natural companion to the compact Lumix DMC-GF1 Micro Four Thirds camera, alongside a Leica-branded 45mm F2.8 Macro (the camera is also available with a 14-45mm kit zoom). The H-H020, as Panasonic curiously likes to call it, is a large maximum aperture 'normal' prime in a very compact 'pancake' type body. It gathers a stop and a half more light than Olympus's M. Zuiko Digital 17mm F2.8 pancake (which is only marginally smaller), and is therefore sure to be of interest to E-P1 owners who want to . . . read more

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