There has been discussions about the sharpness or lack of it from users because of incorrect settings, including FW updates with using the Olympus 100-400 lens. Robin Wong set out to address this issue, but one advice was to set Lens IS Priority to ON, however to according instructions in the manuals I feel it doesn't matter what that setting is, so just leave it set to ON & all will be well anyhow (quoted from E-M1 III manual).
EDIT: The following Robin Wong tells me I am wrong.
One of the things I thought I discovered was using the old E-M5 with a FW update it had in the past that in effect it allowed using all Olympus lenses with in built IS to utilise roll correction that was recently included with E-M1 II & E-M5 III (I believe FW was updated to E-M1 III & E-MX but not included with details). This same update came to E-M10, E-M10 II & E-P5 & E-PL7 which allows the lens's IS to correct for yaw & pitch while the camera body corrects for roll, resulting with 3-axis IS.
Here is the update that was for the E-M5.
Ver.2.2
(Jan.28 2016)
Here's a crop (1000 x 750 pixels) of a photo I took today with the 100-400 lens on my E-M5 (Pittosporum undulatum) using IS ON for both lens & body.
This not recommended, but it seems to work OK though.

Original image.
Lens I.S. Priority Select [On] to give priority to lens on-board image
stabilization when shooting with third-party lenses. [S-IS1]
will be used when [S-IS AUTO] is selected for [K Image
Stabilizer] (P. 97).
• This option has no effect on lenses that are equipped with
an image stabilization switch
stabilization when shooting with third-party lenses. [S-IS1]
will be used when [S-IS AUTO] is selected for [K Image
Stabilizer] (P. 97).
• This option has no effect on lenses that are equipped with
an image stabilization switch
EDIT: The following Robin Wong tells me I am wrong.
One of the things I thought I discovered was using the old E-M5 with a FW update it had in the past that in effect it allowed using all Olympus lenses with in built IS to utilise roll correction that was recently included with E-M1 II & E-M5 III (I believe FW was updated to E-M1 III & E-MX but not included with details). This same update came to E-M10, E-M10 II & E-P5 & E-PL7 which allows the lens's IS to correct for yaw & pitch while the camera body corrects for roll, resulting with 3-axis IS.
Here is the update that was for the E-M5.
Ver.2.2
(Jan.28 2016)
|
This not recommended, but it seems to work OK though.
Original image.
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