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om-1 can do c4k 60p


zlfan
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On 4/7/2025 at 8:58 AM, zlfan said:

The Oly 25mm F1.8 sometimes pulses in continuous AF in video mode.

I've found that in video C-AF, if a lens is stopped down to a small aperture, the OM-1 (and the E-M1 ii/iii) will sometimes decide it's not quite in focus and pulse it to check. If the lens has low focus breathing it's often not noticeable as the depth-of-field at small apertures hides it. But it means lenses with low focus breathing are a good idea if using C-AF in video.

Oly/OMS cameras don't have an AF-lock function, but you can assign the MF (manual focus) function to a button, which basically does the same thing (provided you don't touch the lens focus ring!). Also the AF-ON button can be used to force a re-focus in both C-AF and MF modes. So in MF mode, pushing AF-ON to get initial focus then tweaking it with the lens focus ring if necessary is easy.

On 4/7/2025 at 9:52 AM, zlfan said:

At 25mm the IBIS is very stable, but jerky when panning or tilting.

What video 'IS Level' are you using (-1, 0, +1) and is this in M-IS 1 (with digital) or M-IS 2 (sensor shift only) mode?

At the +1 setting it will be jerky if you move it too fast (It's intended for static hand-held situations), but -1 and 0 settings should be OK for normal movement (in my experience).

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29 minutes ago, zlfan said:

colorwise, although good enough, neither art filter 1 nor hlg 10 bit is as good as the 14 bit ml raw or f3.

The OM-1's strength is as a good handling, relatively light weight, handheld run-and-gun camera with very low rolling shutter. and decent AF. I think it's video quality is more than good enough for that kind of use (which is basically what I use it for), but TBH I don't think it's a camera you'd choose to put on a tripod and shoot a feature film with.

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On 4/10/2025 at 2:02 AM, ac6000cw said:

 

What video 'IS Level' are you using (-1, 0, +1) and is this in M-IS 1 (with digital) or M-IS 2 (sensor shift only) mode?

At the +1 setting it will be jerky if you move it too fast (It's intended for static hand-held situations), but -1 and 0 settings should be OK for normal movement (in my experience).

i used +1. will try 0 for moving. 

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On 4/10/2025 at 2:02 AM, ac6000cw said:

I've found that in video C-AF, if a lens is stopped down to a small aperture, the OM-1 (and the E-M1 ii/iii) will sometimes decide it's not quite in focus and pulse it to check. If the lens has low focus breathing it's often not noticeable as the depth-of-field at small apertures hides it. But it means lenses with low focus breathing are a good idea if using C-AF in video.

Oly/OMS cameras don't have an AF-lock function, but you can assign the MF (manual focus) function to a button, which basically does the same thing (provided you don't touch the lens focus ring!). Also the AF-ON button can be used to force a re-focus in both C-AF and MF modes. So in MF mode, pushing AF-ON to get initial focus then tweaking it with the lens focus ring if necessary is easy.

This lens breathing is what I experienced, at F8 or F5.6, even at F4. I will try MF. Thanks a lot for the input. 

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