Panasonic Dual IS less effective that pure IBIS?

Started Mar 11, 2017 | Discussions thread
OP kolyy Senior Member • Posts: 1,181
Re: Panasonic Dual IS less effective that pure IBIS?

It took me a while, but I did a more systematic test of stabilization effectivity. I constructed a test scene, which I shot standing without any support. My goal was consistency, so I tried not to over-concentrate and kept a rhythm - aim, keep breath for a second, shoot. I shot ten images at each setting and I report the number of those which I have found reasonably sharp at close examination (100%). However, the number of really tack sharp images at pixel level was much lower. Sometimes I report a range, this is when some of the images were quite borderline to be considered reasonably sharp. The pictures with Dual IS, IBIS and no IS were taken with the GX80, the ones with OIS with the GM5.

My summary (TLDR):

Dual IS vs no IS: around 3 stops of gain.
Dual IS vs OIS: less than 1 stop of gain.
Dual IS vs IBIS: very similar. IBIS is particularly strong at normal/short telephoto.

There is a lot of fluctuation, so everything should be taken with a grain of salt. However, I have one important note - a much higher percentage of the "reasonably sharp" images was really tack sharp with Dual IS and IBIS. Most of the pictures were a bit blurry with OIS or without any IS at all. So the gain with Dual IS/IBIS is quite a bit larger with only very sharp images taken into account. I was actually quite surprised to see that most of my images at the 1/EFL shutter speed were not pixel level sharp without IS, as this is a setting which I use quite regularly.

This test partly confirms but also corrects my initial findings in the OP. Dual IS is not clearly less effective than pure IBIS, but it does not really perform any better. IBIS seems to have an edge particularly at short telephoto (which is what I stumbled on initially). On the other hand, OIS is worse, a bit for the number of usable pictures, but very substantially for the number of really sharp ones.

wide angle (14-15mm):

no IS: 1/30s 8/10
Dual IS: 1/8s 8/10, 1/4s 2-3/10, 1/2s 0/10
OIS: 1/8s 7-8/10, 1/4s 1-3/10, 1/2s 0/10

no IS: 1/30s 9-10/10
Dual IS: 1/8s 8-9/10, 1/4s 6-7/10, 1/2s 1/10
OIS: 1/8s 5/10, 1/4s 5-8/10, 1/2s 0-3/10

no IS: 1/30s 9-10/10
Dual IS: 1/8s 9-10/10, 1/4s 6-7/10, 1/2s 2-4/10
OIS: 1/8s 7/10, 1/4s 4/10, 1/2s 0/10

no IS: 1/30s 7/10
IBIS: 1/8s 8-9/10, 1/4s 3/10, 1/2s 1/10

normal perspective (25mm):

no IS: 1/50s 8-9/10
Dual IS: 1/6s 7-8/10, 1/3s 4-5/10
OIS: 1/6s 0-2/10, 1/3s 0/10

no IS: 1/50s 8-9/10
Dual IS: 1/6s 6/10, 1/3s 4/10
OIS: 1/6s 6/10, 1/3s 4/10

no IS: 1/50s 7-9/10
Dual IS: 1/6s 8/10, 1/3s 2/10
OIS: 1/6s 6/10, 1/3s 0/10

no IS: 1/50s 8/10
IBIS: 1/6s 8/10, 1/3s 6/10

short telephoto (35-45mm):

no IS: 1/60s 7-8/10,
Dual IS: 1/8s 6/10, 1/4s 6/10
OIS: 1/8s 1-2/10, 1/4s 0/10

no IS: 1/60s 8/10,
Dual IS: 1/8s 7-8/10, 1/4s 4/10
OIS: 1/8s 5/10, 1/4s 2/10

no IS: 1/60s 10/10
Dual IS: 1/8s 7/10, 1/4s 4/10
OIS: 1/8s 5/10, 1/4s 3/10

no IS: 1/60s 6/10
IBIS: 1/8s 8/10, 1/4s 4/10

 kolyy's gear list:kolyy's gear list
Canon G9 X II Panasonic Lumix DMC-GM5 Panasonic Lumix DMC-GX85 Sony a7 III
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