I've noticed vignetting on all the Panasonic telephotos I've owned...Just purchased this lens at a good price despite having the Olly 75-300 which I now intend to sell. My take is that it has a slight edge on the Olly other than I'm finding quite a lot of vignetting. I haven't seen much of a mention of this when I researched it. Also, I thought that Olly bodies would recognise the length but when I looked at the IS menu it was showing 9mm? Is this normal? perhaps that affected the vignetting?
I had my first outing with it and obviously it made a difference as I had lots of blurred shots, even at shutter speeds of 200. Anyways, here's two of my best X posted to Birds. First with the vignetting and 2nd my attempt to clean it up
View attachment 762866
View attachment 762867Australian Pelican (2) by Kevin Dickinson, on Flickr
View attachment 762868Australian Pelican (1) by Kevin Dickinson, on Flickr
I've noticed vignetting on all the Panasonic telephotos I've owned...
The IBIS focal length is only used for manual lenses, you don't need to do anything for an electronic lens. Interesting you mention blurry shots - I always thought I just had poor technique. Shutter shock perhaps?