Among all professional lenses, the Panasonic 20mm f1.7 has the best optical performance. This lens has also outshined many Panasonic lenses. I wish you could just take a photo with this lens and see how wonderful this lens is! Apart from vignetting control, the other defects (chromatic aberration and distortion) are fantastically controlled on this Panasonic lens. They are reduced to their lowest degree at every aperture. All professional photographers also agree that this lens is better than Olympus lenses especially Olympus 17mm.
The Panasonic 20mm f1.7 has the perfect build quality for the Olympus Micro Four Thirds and the Panasonic Micro Four Thirds camera. This lens however does not match with the regular Four Thirds camera. If you are looking for a lens that has extremely fast and accurate autofocus performance, then this is the right lens. The build quality on this lens is very good. Also, image stabilization on this lens is admirable.
Want to know how to take professional pictures? Taking pictures must maintain proper consideration to the aspect of photography. Yes, it is necessary to consider several technical aspects if you want to produce professional pictures.
Light. The diffusion of the light within the subject is a prime matter to be consider on how to take professional pictures with quality. You need to develop the skill on how to place the subject in the right angle of the light. The right amount of light that the camera lens is receiving can help produce good pictures.
Background. If you want to know how to take professional pictures, it is necessary to know how to make proper backgrounds. In nature photography, you need to choose the right background angle that will produce the best photo. In macro photography, it is necessary to use the right color of the background to accentuate the subject.