QUOTE(samurai1337 @ May 23 2010, 12:28 AM)
Are you talking about Olympus or Panny 14-42mm?

Anyway, to make it simple for you to understand:
14-42mm f3.5/5.6
- More versatile, because of its zoom capability (can shoot wider too) - better if you shoot event or wildlife
- Larger and heavier
- "Slower", means even at maximum aperture (lower f-stop) your image will appear blur if there's subject movement
- More difficult to capture sharp image under low light situation
20mm f/1.7 a.k.a "pancake"
- Cannot zoom (it's a prime lens - means the focal length is fixed)
- Lighter and smaller
- Faster... handy if you shoot pets or kids at f/1.7 - image would be sharp even there's subject movement
- Image is sharper if you capture photo under low light situation (e.g. indoor)
- At maximum aperture (f/1.7), you can have more obvious background blurring effect (known as Bokeh), like this:

For me (I own both 14-45mm kit lens and 20mm prime), I use the zoom lens occasionally for landscape or event (when zooming is required), but I use the pancake most of the time because it's lighter and take sharper image.
Sorry, I'm forgot to state what lens. I'm talking about Olympus 14-42mm f3.5/5.6 and 20mm f/1.7 a.k.a "pancake".
Thanks for the info, bro...Its really help...
I will go for e-pl1 adding with the pancake lens...
Added on May 23, 2010, 10:08 am[COLOR=red][SIZE=7]
QUOTE(bobds78 @ May 23 2010, 07:30 AM)
I think you are trying to compare oly m zuiko 14-42 kit lens that comes with camera and GF1 kit lens 20mm right? And you want to trade-off the oly 14-42 for a 20mm?
1st off, the oly kit lens does not worth much compared to the pany pancake 20mm which costs a lot more. However, like samurai put it nicely, the oly 14-42mm is a much more versatile lens overall, having wider coverage from 14mm up to 42mm, so its more useful in that sense. With this wider coverage, you can click away without the subject noticing you, well most of the time. The oly costs around 1k (new) and anything from 0.5k to 0.8k (used) while the pany is around 1.4k(new) and its very hard to find used unit. So you can see both lenses are good actually. Pany 20mm is more of a keeper lens. Go to www.stevehuffphotos.com. Steve has very good 'real world experience' review of both the lenses.
Hope this is helpful.
Right, I'm compare both of the lens....
Thanks for the info. This really help....
[WTS] SONY W950i & HTC SNAP (USED SET)This post has been edited by Guy85: May 23 2010, 10:08 AM