"...the ISO performance of the Z 6III is very similar to that of the D6 (and from a noise perspective it's about 1.3 to 1.5 stops "better" than a Z 9 or Z 8)"
"...the ISO performance of the Z 6III is very similar to that of the D6 (and from a noise perspective it's about 1.3 to 1.5 stops "better" than a Z 9 or Z 8)"
He must be comparing to the Z9/Z8 at 100%, which doesn't have any real-world practical relevance.
Snapsy posted:
"I've started my comparison of the Z6 III vs Z8 for video. Here's an early look at NRAW between the two, the Z8 shot @ 8K vs Z6 III @ 6K, both normalized to the same resolution in Resolve to the Z6 III 6K"
I recall a thread from several years ago on dpreview wherein the autism was growing especially strong and people were comparing z7 stills to z6 stills to try to figure out whether downsampling negates poorer low light performance. It turned out that when z7 files were downsampled to match z6 resolution, the z7 files looked superior. But when both files were downsampled to around 4k, the z6 files looked slightly better. Based on that, im expecting much closer results if both z6iii and z8 are downsampled to 4k.
Im also wondering about iso 100. If you're testing low light performance, shouldn't you use the cameras like most people would in low light, setting iso to 800+ to engage the higher gain?
drcrumble wrote:
Snapsy posted:
"I've started my comparison of the Z6 III vs Z8 for video. Here's an early look at NRAW between the two, the Z8 shot @ 8K vs Z6 III @ 6K, both normalized to the same resolution in Resolve to the Z6 III 6K"
I recall a thread from several years ago on dpreview wherein the autism was growing especially strong and people were comparing z7 stills to z6 stills to try to figure out whether downsampling negates poorer low light performance. It turned out that when z7 files were downsampled to match z6 resolution, the z7 files looked superior. But when both files were downsampled to around 4k, the z6 files looked slightly better. Based on that, im expecting much closer results if both z6iii and z8 are downsampled to 4k.
Im also wondering about iso 100. If you're testing low light performance, shouldn't you use the cameras like most people would in low light, setting iso to 800+ to engage the higher gain?...Show more →
Downsampling both sources to a common resolution is essential to eliminate any disparity (both beneficial and detrimental) introduced by downsampling itself, primarily the sharpening employed by the dowsampling algorithm. Based on how the downsampling algorithms work, both sources must be downsampled beyond a certain ratio to their original resolution. This is partly why my comparisons of both cameras at 4K will be featured prominently, not to mention because 4K UHD is a very popular deliverable format. With that, here is the original 6K comparison I posted, with a 4K comparison added:
A lower resolution sensor will always outperform a higher resolution sensor at ultra high ISO / low light exposures due to the relative read noise disparity between the two arising from the pixel count differences, even after downsampling, provided both sensors share similar performance characteristics.
My low ISO comparisons are not meant to compare low-light performance - they're meant to compare dynamic range, which is always highest at base ISO, even on sensors with dual gain ISO. Naturally they also include a large element of low-light performance as well since they require low exposures to simulate the conditions required for maximum DR of a high DR scene (ie, exposing the highlights within clipping, which requires shifting the exposure to the left).
all this DR and noise level, clients don't care, they will never see it. I want to know about overheating in video, and if someone would compare SLOG3 vs NLOG and see what the differences are.
3catsinky wrote:
all this DR and noise level, clients don't care, they will never see it. I want to know about overheating in video, and if someone would compare SLOG3 vs NLOG and see what the differences are.
Before everyone starts ranting about the Z8 video, I’d like to normalize a few things -
- The Z8 is a hybrid camera offering both stills and reasonable video capability to those who do occasional video. It is NOT a full-on video camera. Those requiring a heavy duty video camera, get a Z9 or a video camera!
- It is a lighter duty cycle than the Z9 and does not have the heat sync capabilities of the Z9. It will not perform exactly like the Z9.
- There are CFExpress cards that run much hotter than others, sometimes because of slow read/write speeds. Don’t blame the Z8 for overheating because of failure to choose a proper CFExpress card. Do your research.
- If you are going to record extended video, don’t use the SD card as backup, etc. When the Z8 has to write to both cards, the read/write speed falls to the lower rate of the SD card and can cause pre-mature heating. Write to the CFExpress card.
- Cameras from Sony and Canon can also experience overheating due to high resolution video recording. This is definitely not unique to Nikon.
Sorry I can’t provide a comparison of video quality, but I’m sure others will provide some input.
3catsinky wrote:
all this DR and noise level, clients don't care, they will never see it. I want to know about overheating in video, and if someone would compare SLOG3 vs NLOG and see what the differences are.
You can do your own SLOG3 vs NLOG comparison in Davinci Resolve by importing any video footage and converting it to both and comparing what each provides.
cameraman72 wrote:
Has anyone tested the electronic shutter with LED lights? How useable is it on the Z6iii?
Thanks.
It has features to address flicker reduction, but I’ve not seen any comments so far. Here’s something from Nikon that shows the features to address flicker reduction. Keep in mind that right now flicker reduction is more of an art than a science.
story_teller wrote:
It has features to address flicker reduction, but I’ve not seen any comments so far. Here’s something from Nikon that shows the features to address flicker reduction. Keep in mind that right now flicker reduction is more of an art than a science.
The feature lets you set a fractional shutter speed, in 1/96 increments. This can work, but the problem is Nikon requires the user to figure out the light's cycling frequency on their own. Canon's implementation automatically detects the light frequency and plugs in the fractional speed for you. Here's a quick demonstration I did a few months ago:
GroovyGeek wrote:
NR has screenshots of used Z6iii's available for sale right around $2k. Must have sold immediately because they are no longer available.
Being a Saturday (Jewish sabbath), B&H's checkout is unavailable until sundown, meaning those used Z6 III's were probably available on the site all day but couldn't be purchased until Saturday night.
Someone on DPR posted a link to a YouTube video that demonstrates significant noise fluctuations in the shadows for Z6 III video, which the YouTuber describes as a "flickering" problem. He compares the Z6 III to both the Z9 and S5 II, neither of which demonstrate the phenomena. Here's the video:
I just tried to reproduce it myself, comparing to my S5. Here are my results:
snapsy wrote:
Someone on DPR posted a link to a YouTube video that demonstrates significant noise fluctuations in the shadows for Z6 III video, which the YouTuber describes as a "flickering" problem. He compares the Z6 III to both the Z9 and S5 II, neither of which demonstrate the phenomena. Here's the video:
I just tried to reproduce it myself, comparing to my S5. Here are my results:
Just posted a thread on this. He’s not going on about the noise, but the flickering and color shifts. Look at the 2:15 footage, you can see flickering, especially when he over exposes the footage. He said his settings for that scene was:
4K/25p - 1/50 - H.265 10-Bit - NLOG, than used Nikon LUT in post.
ArizonaImage wrote:
Just posted a thread on this. He’s not going on about the noise, but the flickering and color shifts. Look at the 2:15 footage, you can see flickering, especially when he over exposes the footage. He said his settings for that scene was:
4K/25p - 1/50 - H.265 10-Bit - NLOG
Understood. I couldn't reproduce his findings. I posted a comment with a link to my recreation attempt and a request for more details.
snapsy wrote:
Understood. I couldn't reproduce his findings.
Try NRAW + NLOG and 5000 ISO in a HDR setting. I did this to really push it, and saw what he saw. Color shifts and slight flickering. Obviously at 6400 it cleaned up nicely, so I wouldn’t shoot 5000 iso but I could replicate this findings.
ArizonaImage wrote:
Try NRAW + NLOG and 5000 ISO in a HDR setting. I did this to really push it, and saw what he saw. Color shifts and slight flickering. Obviously at 6400 it cleaned up nicely, so I wouldn’t shoot 5000 iso but I could replicate this findings.
Here is an NRAW comparison between ISO 5000 and 6400
