I find either very slow gradual zooms or quick crash zooms work best with these types of lenses. That middle speed is where you notice this the most. will run some tests to confirm this With this particular lens.
Comparison with Olympus 12-40 mm f/2,8 at
http://www.focus-numerique.com/test-2542/duel-panasonic-12-35-mm-f28-vs-olympus-12-40-mm-f28-1.html
i just got a like-new sigma 18-50/2.8 that i put on a gh2 body. i'm not able to use the manual assist fonction with that lens (tumb push on the back wheel). is it normal, or is it the result of using a 4/3 toM4/3 adapter, being neither the panasonic nor the olympus one?
Firmware Update to Ver. 1.3
http://av.jpn.support.panasonic.com/support/global/cs/dsc/download/fts/dl/hs12035.html
2015/08/05
Ver. 1.3
Dual I.S.( Image Stabilizer ) is available by this firmware update. (in case of the usage of Camera with this function) * Dual I.S.:Innovative Handshake Correction System by the ideal combination of lens I.S and Body I.S.
Center sharpness peaks at around f/4 at 12mm, though f/5.6 and f/8 perform is a very similar manner. As for the corners and edges, I would declare a tie between f/4 and f/5.6. Although the fastest aperture of f/2.8 is very useable in both the corners and at the center, it is noticeably softer than f/4 at 12mm.
http://www.mirrorlessons.com/2015/11/23/panasonic-12-35mm-review/
Those worried about there being a dramatic difference in sharpness between the two zooms can rest easy – both perform very well throughout the zoom and aperture ranges. Neither is quite as sharp as a prime lens but the results are more than enough for most purposes.
http://www.mirrorlessons.com/2015/12/07/panasonic-12-35-vs-olympus-12-40/
One friend said that this lens can adjust aperture smoothly (auto exposure) during video recording. Can someone confirm that using S-mode (via video menu) and fixed iso the lens adjusts exposure smoothly.
Most Panasonic lenses adjusts aperture in steps making shutter priority auto looking quite bad.
Thanks. Can you one more time test if the aperture changes smoothly when you pan from dark to very bright in example towards sky or a lamp. Is there any "clicks" when the aperture goes smaller? Shutter priority (video menu S) and fixed iso. It is hard for me to believe the aperture changes smoothly.
Auto iso and shutter speed changes very smoothly without any steps.
The problem is coming from the manufacture of the lens. Panasonic choose to privileged the photographer customer. In fact, it's a cool feature for not loosening light at any focal, but this is not good on video because we can't use it for zooming without having step-less aperture. But I'm sure if we complain a lot at Panasonic to obtain the possibility to shut down this feature, we will have the possibility to zoom with a loose of light that we can manage in post-production. What do you think about it everyone ?
@marcan169 I would say initiate your petition. I'll sign it. I'm sure a lot of others on this site and other sites would as well.
Would anybody tell me pls if after upgrading 12-35mm lens firmware from 1.2 to 1.3 (which features dual image stabilisation, to cover cameras with IBIS) the lens still works OK with no IBIS cameras, like GH3 or GH4? I know it would, but does it?
All right, checked it - it does, as expected.
Any of you have repair/service manual of this 12-35mm f2.8 lens? My lens such some amount of dust behind the front element. I want to clean it up. Is it possible?
Available for $697 but with $100 gift card
The Dual-IS 2 firmware update for the original f/2.8 zooms has been cancelled due to hardware limitations.
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