The Panasonic G1HD | GH-1 Video Mode : A Real Video Mode

Nope. No changes. It's the same as with the ProRes. Hunter are you not getting any aliasing on wides?

Please post up some wide stills... I hope it's just something I'm doing wrong.

Also, Hunter... what's your current thought on Crop Factor? How much more telephoto is your 50mm Nikon over the 50mm point on your Kit Lens zoom?
 
hunter richards said:
I think some of the aliasing may be enhanced when transcoding. Did you have any changes when using cineform Kholi?
Click to expand...

I'm definitely interested in Cineform NeoScene as well. Seems to produce smaller file sizes than ProRes. Also, from what I hear, the transcoding is faster and the pull down removal more efficient.

As for the aliasing, isn't it the case that both Kholi and Phil Bloom so far have only been using the Panasonic 14-140 zoom that comes with the GH1, whilst Hunter used some other lenses. If this is the case it makes me think that it could indeed be the Panasonic lens causing this problem.

Hunter, are you getting similar aliasing?
 
Nektonic said:
I'm definitely interested in Cineform NeoScene as well. Seems to produce smaller file sizes than ProRes. Also, from what I hear, the transcoding is faster and the pull down removal more efficient.
Click to expand...

ALL true. Cineform NeoScene rocks
 
More aliasing on wide angle shots may just have to do with the deeper focus. It's always there but with more of the frame sharp it's more common & noticeable.

If the GH1 is skipping lines for HD acquisition then it will have aliasing to some extent. You can avoid this by using some diffusion. Try soft fx 1 or just some black diffusion.
 
If it's skipping lines, we may be able to create a filter (ala D90) that can filter the stair stepping for final renders. If the aliasing is coming from incorrect pulldown removal, or pulldown removal on sequences that may have broken cadence, then we'll have to find another solution.

For example, sometimes the D90 drops frames. If this happens with the GH1, it may be possible that there is some irregularity with the with the 3:2 pulldown. Guess it will take time to find all these things out.
 
Kholi said:
Also, Hunter... what's your current thought on Crop Factor? How much more telephoto is your 50mm Nikon over the 50mm point on your Kit Lens zoom?
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Imaging format is what determines crop factor, not the lens. Any 50mm lens that has a target large enough to cover the sensor on the GH1 will have exactly the same FOV as the standard GH1 10-1 kit lens. The same holds true at every focal length.

Hope this helps.

I.

Illya Friedman
Hot Rod Cameras
 
Illya Friedman said:
Imaging format is what determines crop factor, not the lens. Any 50mm lens that has a target large enough to cover the sensor on the GH1 will have exactly the same FOV as the standard GH1 10-1 kit lens. The same holds true at every focal length.

Hope this helps.

I.

Illya Friedman
Hot Rod Cameras
Click to expand...

That's what I'm trying to figure out.

If a 50mm Canon is the same as the 50mm point on the Kit Lens.

If that's true, then doesn't that make the Tokina 11-16, a DX Format Lens, an 11mm on the GH-1 with 11mm FOV. I really could just solve this in one stroke if I had my damned adapters already. Ugh.
 
Kholi said:
That's what I'm trying to figure out.
Click to expand...

I took a look at Bloom's footage in Vegas - the aliasing people are seeing is along high contrast light/dark edges that are close/might be clipped.

I wonder if this a gamma issue as lower contrast diags seem to not have it?

The DVX series had a similar issue with cinegamma and high contrast edges.
 
Kholi said:
That's what I'm trying to figure out.

If a 50mm Canon is the same as the 50mm point on the Kit Lens.

If that's true, then doesn't that make the Tokina 11-16, a DX Format Lens, an 11mm on the GH-1 with 11mm FOV. I really could just solve this in one stroke if I had my damned adapters already. Ugh.
Click to expand...

Wait a minute, are we saying that the 2x crop factor is not really a 2x crop on the GH1 when using 35mm format lenses? I thought it was determined that the GH1 does in fact have the crop factor. Maybe I'm just confused?
 
I know someone said this earlier. But all of the aliasing really does look like aliasing that comes along with field issues. Either field issues in the final cut sequence settings or during one of the converts.

I would love to get my hands on even five seconds on raw footage that has the problem.
 
If its a field issue you will see it straight out of the camera. If 3:2 isn't removed correctly, you will continue to see the issue. Whether or not this is causing the aliasing remains to be seen, but it definitely needs to be tested further with RAW footage. Time to import a camera :D
 
I sent a PM to some who have the camera but no response yet so I will post it here in case it was somehow overlooked.

Many of us are very interested in having an opportunity to see the footage. All we can do is speculate and watch youtube videos.

I will provide ftp access, unlimited bandwidth, and unlimited space for anybody willing to upload original unaltered videos. Can also keep it anonymous.

PM me if interested.
 
Has anyone seen this? http://www.vimeo.com/2738955 (download the 1080p - it's scary bad ruin-your-shot aliasing)

Evidently, it's a serious issue with the 5D MkII, so maybe it is the downsampling issue - some interesting discussions.

The good news, is nothing from the GH1 seems anywhere near this bad, so maybe Panasonic is aware and did do some things to improve over the D90 & 5D MD Mk II
 
Yes it's a downsampling issue. The 5D Mark II skips lines, it only samples every third row.

I am certain GH1 does the same, but since it has less lines to sample it probably does not have to skip as many and the effect is not as bad.

Edit.. Actually this really also depends on other factors too.
 
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