how do om1 mkii or even om1 dci 4k video quality comparing to gh7 or even gh6

[zlfan]

3 hours ago, John Matthews said:

Could you be more specific? Adapted lenses?

they are 43 lenses, an adapter is needed. 

[zlfan]

3 hours ago, ac6000cw said:

This is a collection of SOOC files from my OM-1 - https://drive.google.com/open?id=1527WMHFXJmDvTGI74QINJQdstgJPhXyt&usp=drive_fs

Most are 10-bit OMLog400 and two are 10-bit HLG (in low light).

The four files in the 'Road' folder are all of the same scene shot back-to-back, 10-bit OMLog400, in FHD 50p, UHD 50p and UHD 25p as a comparison.

Most were shot with the Oly 12-40mm pro lens, using sensor-shift IBIS only, auto-WB, 1/100 shutter priority (auto aperture and auto iso). All using C-AF with a medium size central focus area and default C-AF speed and sensitivity settings.

The file in the 'Train crossing road' folder is 8-bit UHD 50p and demonstrates the the low rolling shutter.

There is an OM System OMLog400 Rec2020 to Rec709 conversion LUT here - https://support.jp.omsystem.com/en/support/imsg/digicamera/download/software/3dlut/files/om1_LUT_OM-Log400_BT.2020_to_WDR_BT.709_v1.0.zip - but personally I don't particularly like the results from it.

the footage looks great even without any grading. 

[zlfan]

5 hours ago, ac6000cw said:

This is a collection of SOOC files from my OM-1 - https://drive.google.com/open?id=1527WMHFXJmDvTGI74QINJQdstgJPhXyt&usp=drive_fs

Most are 10-bit OMLog400 and two are 10-bit HLG (in low light).

The four files in the 'Road' folder are all of the same scene shot back-to-back, 10-bit OMLog400, in FHD 50p, UHD 50p and UHD 25p as a comparison.

Most were shot with the Oly 12-40mm pro lens, using sensor-shift IBIS only, auto-WB, 1/100 shutter priority (auto aperture and auto iso). All using C-AF with a medium size central focus area and default C-AF speed and sensitivity settings.

The file in the 'Train crossing road' folder is 8-bit UHD 50p and demonstrates the the low rolling shutter.

There is an OM System OMLog400 Rec2020 to Rec709 conversion LUT here - https://support.jp.omsystem.com/en/support/imsg/digicamera/download/software/3dlut/files/om1_LUT_OM-Log400_BT.2020_to_WDR_BT.709_v1.0.zip - but personally I don't particularly like the results from it.

uhd 50p 10 bit and fhd 50p 10 bit are the same to my eyes. no significant difference.

if these are handheld shots, they are excellent. nobody will doubt that these shots are on tripod. 

uhd 25p 10 bit is almost the same as uhd 50p and fhd 50p, except that when cars move into the scene from the right to the center, when the cars enter, I can see minor jumpy feelings sometimes. the 50p modes have smooth car movements. 

om1 dr seems good. the sky and the clouds seem nice. 

thanks a lot for the testing footage. regards, 

[zlfan]

generally speaking, I think om1 video image quality is good enough for general usage. if carefully executed in acquisition and in post processing, the footage can be put on a theatre screen without much concern. as by my experience, a laptop screen with a viewing distance of 1 foot or a desktop 4k screen with a viewing distance of 2 feet, is more demanding than sitting in the middle of a commercial theatre watching the large screen. 

[zlfan]

5 hours ago, ac6000cw said:

Doubtless because most people regard it as a 'hulk' - but you do get the equivalent of a free, non-removable battery grip included, as well as an earlier version of the Ai subject detection and tracking that's in the OM-1 (which isn't in the E-M1 iii that followed the E-M1x).

I've never owned one (or had any interest in such a large m43 camera), but in theory it may/should have.

most high end cameras with integrated battery grip have higher internal voltage than cameras with no battery grip, so faster af and some other features due to the higher internal voltage. add-on battery grip is better than no but not as good as integrated battery grip. 

[ac6000cw]

2 hours ago, zlfan said:

uhd 25p 10 bit is almost the same as uhd 50p and fhd 50p, except that when cars move into the scene from the right to the center, when the cars enter, I can see minor jumpy feelings sometimes. the 50p modes have smooth car movements

I suspect when I shot the 25p video I forgot to change the shutter speed from 1/100 (180 degree shutter for 50p) to the 1/50 needed for 25p. That would make it look stuttery/jumpy.

2 hours ago, zlfan said:

if these are handheld shots

All of the video samples were shot handheld, with only sensor-shift IBIS enabled (probably at the highest, +1, stability setting).

[zlfan]

21 minutes ago, ac6000cw said:

I suspect when I shot the 25p video I forgot to change the shutter speed from 1/100 (180 degree shutter for 50p) to the 1/50 needed for 25p. That would make it look stuttery/jumpy.

All of the video samples were shot handheld, with only sensor-shift IBIS enabled (probably at the highest, +1, stability setting).

fantastic results, actually. you convinced me to buy the om-1. I will look for some deals during the Christmas season. thanks a lot for the help. you work on the train is also interesting. 

[ac6000cw]

On 6/21/2024 at 1:07 PM, ac6000cw said:

This is a collection of SOOC files from my OM-1 - https://drive.google.com/open?id=1527WMHFXJmDvTGI74QINJQdstgJPhXyt&usp=drive_fs

Just added a clip of walking along using only sensor-shift IBIS (probably on the max +1 video stabilisation setting) in the 'IBIS_walk' folder (OM1_walking_with_IBIS_P8260305.MOV)

It's quite wide-angle so has a fair amount of corner warping, but I really like the way it becomes very stable as soon as you stop walking.

[zlfan]

 

according to this guy, om1/em1 3/em1 2 are all line skipping video, even in hdmi out raw, which is unexpected, raw should be pixel by pixel? otherwise, it is not called raw?

[ac6000cw]

12 hours ago, zlfan said:

according to this guy, om1/em1 3/em1 2 are all line skipping video, even in hdmi out raw,

E-M1 iii hdmi RAW output uses a center crop - it's the inner rectangle in the graphic below (from the video at 4:39):

AFAIK, Nikon also use sub-sampling for some frame sizes of N-raw video, and ProRes RAW, BRAW and N-raw use lossy compression - so you don't really get raw sensor data, it's always been processed. The main point of (pseudo) raw video is to give you files with higher bit depth and DR (than e.g. 10-bit log) plus probably metadata about the sensor characteristics to allow more latitude to adjust color balance, correction, exposure etc. in post.

This is the same guy's general take on using OM-1 for video (which I'd mostly agree with):

 

Not raw video, but this is DPReview's video test chart comparison of DCI 4K on the OM-1 (10-bit) and GH6 - they are very close in sharpness/resolution and having minimal aliasing/moire. That suggests to me that for internal UHD/C4K 10-bit video at 24/25/30p, the OM-1 is using over-sampling, not line-skipping.

[zlfan]

14 hours ago, ac6000cw said:

E-M1 iii hdmi RAW output uses a center crop - it's the inner rectangle in the graphic below (from the video at 4:39):

AFAIK, Nikon also use sub-sampling for some frame sizes of N-raw video, and ProRes RAW, BRAW and N-raw use lossy compression - so you don't really get raw sensor data, it's always been processed. The main point of (pseudo) raw video is to give you files with higher bit depth and DR (than e.g. 10-bit log) plus probably metadata about the sensor characteristics to allow more latitude to adjust color balance, correction, exposure etc. in post.

This is the same guy's general take on using OM-1 for video (which I'd mostly agree with):

 

Not raw video, but this is DPReview's video test chart comparison of DCI 4K on the OM-1 (10-bit) and GH6 - they are very close in sharpness/resolution and having minimal aliasing/moire. That suggests to me that for internal UHD/C4K 10-bit video at 24/25/30p, the OM-1 is using over-sampling, not line-skipping.

Thanks for the detailed information. 

I checked the DPReview's chart comparison, you are right, DCI and UHD 4k, both OM1 10 bit and GH6 10 bit are the same, even to the smallest details. 4K IS loses details at the rightest block in the middle row, 4K 60p loses the rightest two blocks in the middle row. I guess if GH6 has related 4K IS and 4K 60p, the results may be similar too. 

I think you are right, the OM-1 video is not line-skipping, but over-sampling.