How many of GX9's "5-axis IBIS" are actually IB?

atomic77 wrote:

I hope this old thread is appriopriate to my question, because it's still unclear for me.

Can anyone say what is really GX9 stabilization like? I made a lot of web research, including this thread, and still don't know, if:

1. IBIS + OIS are 4-stops only when used both as Dual I.S.

2. or IBIS is 4-stops alone, even with unstabilized lenses, plus stabilized lense as an addition.

There are not many tests or reviews of gx9 (much more about G9), and the ones I found says about 4-stops or 6.5-stops (I think it's mistakely taken from G9).

The official specification says: "Image sensor shift type (5-axis / 4-stop*), Dual I.S. compatible/*" witch in my opinion is the first one, the sensor is 4-sops. But on another official page Panasonic says "The 5-axis Dual I.S. works (...) and makes it possible to use a 4-stop slower shutter speed".

I'm asking, because Olympus e-m10 iii specification says about 4-stops IBIS and I wanted to compare, how GX9 works with non-Dual IS lenses. I know it's just theoretical anyways.

If you own a GX9, unmount the lens, switch the power on, and try to move the camera around you can see the sensor moves.

Indeed it is a floating sensor held in place by electromagnetic force on power on. GX9 is also an improved version from the GX85. In case of GX85, on power off, I can see the sensor rock inside the casing when move the cam from side to side. According to Helen, the sensor of GX9 sits mire steadily in its position.

Therefore, the GX85/9, same as G85, GH5 and G9, are a true 5 axis IBIS system. GX7 and GX8 uses a fixed position design (non floating).

I did my home testing on my newly purchased GX85 last year, it had given me around 5 stops of effective stabilisation on 12~35 f/2.8 @35, or 4 stops on 12~32 @32 vs the traditional rule of thumb. Both lenses are Dual IS compatible.

On my only non OIS lens 14 f/2.5, I had around 2 stops stabilisation which is around 1 stop more effective than on GX7. Some members claimed the new IBIS of Pany to have very effective IBIS for non OIS lenses, I can't varify it.

A rule of Pany, in case of an OIS lens (non Dual IS compatible), only lens OIS or no stabilisation be allowed.