Serenar 100mm f/4 II

Good but not great I had the original 100-300 and didn't like the sharpness at anything over ~260-300. I sold it and got the 100-300 mk II. It seems that it pretty much has the same glass. The weather sealing is good and the auto focusing is faster but it isn't noticeably sharp at the long end. That being said, perhaps that is the best one can expect at that price point. At this price point, size, and weight I haven't found a comparable micro 4/3 lens that offers more. I'm sure it would be a hit if someone would make a sharper version of this lens.

Great price and weight but a tad soft On the plus side, this lens is light and affordable. The image resolution is average, not as good as the 100-400 sibling but also half the weight and price. The auto focus is not as good as my other shorter focal length lenses, but In Nov 2018, Panasonic is supposed be coming out with a software update that will fix the focus problem. If this works, I’d add a star to my review. If razor sharp photo are your goal, spend more on the 100-400. If you work without a tripod, the 100-300 is a very nice compromise.

Good Enough Is Pretty Darned Good! I've read the this lens is soft at its extremes. I think, in fact, this is true, but "soft" is relative. It produces useable images that satisfy my needs perfectly. If you're a pixel peeper and aren't happy with anything less that what a $2000 lens would produce, you might not like it. I don't have that need. The lens I received was in excellent condition. The included photo is of a radio tower that's a little over a mile away. I shot this hand-held at the 300mm setting.