GH1 720p59.94 and 1080p24 modes at DVinfo.net

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Panasonic LUMIX G / GF / GH / GX Series
4K and AVCHD on a Micro Four Thirds system camera with interchangeable lenses.


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Old March 5th, 2009, 11:09 PM   #1
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GH1 720p59.94 and 1080p24 modes

Here we have a mix -- 1080 is 24.00fps which makes sense going to films, but can cause trouble in the video world. Motion judder is VERY high -- or VERY BAD -- depending on your feeling about judder.

The 720p is 59.94 and is smooth as butter.

The GH1 was clearly the -- by a big margin -- the best new camera at PMA.

Three issues:

1) when I said the lens was "slow" the rep said he didn't think so. We checked, at I'm sure I saw notation the lens was "1.4 to ???." I must be been wrong because that not what the data sheet says.

2) There is NO power zoom. Now even if you never zoom while shooting video -- not having a way to make quick focal length changes is a real negative. Plus, we all know we zoom. Unfortunately, the manual ring zoom control was VERY tight so not only was zooming not smooth -- you had to use so much force the camera moved.

3) The hand grip is hard and very tiny. Not pleasant to hold.

PS: The Pana rep expressed it well -- at $1500 folks would still buy it, but not feel good. At $1200 folks would feel good. At a $1000 it would be a super bargin.
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Old March 5th, 2009, 11:54 PM   #2
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Considering the Fact that their TM300 camcorder retails for $1,300, it’s extremely unlikely that the GH1 including the 10x lens will sell for $1,000, but it would definitely sell like crazy. It would be like the Nintendo Wii for interchangeable lens cameras.
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Old March 6th, 2009, 12:49 AM   #3
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Considering the Fact that their TM300 camcorder retails for $1,300, itís extremely unlikely that the GH1 including the 10x lens will sell for $1,000, but it would definitely sell like crazy. It would be like the Nintendo Wii for interchangeable lens cameras.
Totally different divisions with different price points. The current G1 is only $800. I can't see the upgrade costing that much more when its really the same camera with a new function. Pana is revising its USA marketing strategy because it's not happy with its sales. That could mean anything.

Sony would love to have a Wii. :)
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Old March 6th, 2009, 01:00 AM   #4
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I’ve read that and I do see your point since it’s actually selling for $670 at B&H, except for the part about it being a G1 with an added function. Theirs a better Live MOS chip, better engine, a far more advanced lens and obviously a few HD video modes. Personally, I’m expecting $1,200 to $1,300 but $1,000 would definitely be a game changer.
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Old March 6th, 2009, 07:30 AM   #5
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You say that motion judder is really noticeable in 1080p mode. Can it be because the shutter was set at a higher speed than 1/48? I mean, can you control shutter speed in video mode?
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Old March 6th, 2009, 11:58 AM   #6
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Originally Posted by Jose A. Garcia View Post
Can it be because the shutter was set at a higher speed than 1/48? I mean, can you control shutter speed in video mode?
Yes, you can set the shutter speed to 1/48th and keep it there when shooting 24fps. That's my plan-- keep the aperture wide open, shutter 1/48th and let adjust ISO to get the right exposure.
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Old March 6th, 2009, 02:59 PM   #7
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You say that motion judder is really noticeable in 1080p mode. Can it be because the shutter was set at a higher speed than 1/48? I mean, can you control shutter speed in video mode?
yes -- but the minimum is 1/60th which is "correct" for 60i and 720p60.
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Old March 6th, 2009, 03:17 PM   #8
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The GH1 does have a slow lens

"1) when I said the lens was "slow" the rep said he didn't think so. We checked, at I'm sure I saw notation the lens was "1.4 to ???." I must be been wrong because that not what the data sheet says."

The rep and I were both wrong. The lens on the demo camera did say "1 4" but I missed the ":" so it really is F4.0-5.8 which is really slow. Which is what I said to the rep. Lise a stop slow than other cameras. Of course, perhaps the cmos chip is 2x more sensitive.

This makes me think the camera can't be priced much above the current still-only version. How much cost in the unit to add the AVCHD encoder and modify the firmware?

Questions:

1) Not clear to me if the 17.3mm x 13.0mm chip in a four-thirds camera is going to provide the DOF of a 35mm chip.

2) The bigger the chip, the more one can stop down without diffraction. So with a 35m frame, one could stop down to f/22. If a four-thirds camera provides the same effective area as does a 35mm camera -- then the Pana lens stopping down to f/22 is useable. But, if it's not the "same" then does diffraction set in at f/11?
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Old March 6th, 2009, 03:18 PM   #9
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So it's possible that the PAL version has 25fps and 1/50 of minimum shutter, which is closer to cinema, except for the extra frame per second.

So even if you had both PAL and NTSC options in the same camera, 24fps at 1/50 wouldn't look right either... I guess we have a first weak point in this camera if you want to use it to get a cinema look.
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Old March 6th, 2009, 03:22 PM   #10
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So it's possible that the PAL version has 25fps and 1/50 of minimum shutter, which is closer to cinema, except for the extra frame per second.

So even if you had both PAL and NTSC options in the same camera, 24fps at 1/50 wouldn't look right either... I guess we have a first weak point in this camera if you want to use it to get a cinema look.
It never shoots 25fps or 30fps. This is a 50i/60i 1080 interlace camera or a 720p50/p60 camera.

The photo-jpeg is only 30fps no matter your region.
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Old March 6th, 2009, 03:52 PM   #11
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Edited... Double post.
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Old March 6th, 2009, 03:59 PM   #12
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Yes, but the data sheet says the sensor shoots 25-30 progressive fps and then converts the stream to interlaced with a 3:2 pulldown. Anyway I meant that the 1080i50 mode may have a minimum shutter speed of 1/50. Also I guess it's pretty clear that "interlaced" mode is just a disguised progressive.
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Old March 6th, 2009, 07:02 PM   #13
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By the way, I know you've already played with it and you may know better, but the specs say 60 -1/4000 sec of shutter speed. Are you sure it cannot be set to 1/48?
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Old March 6th, 2009, 07:17 PM   #14
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Yes, but the data sheet says the sensor shoots 25-30 progressive fps and then converts the stream to interlaced with a 3:2 pulldown. Anyway I meant that the 1080i50 mode may have a minimum shutter speed of 1/50. Also I guess it's pretty clear that "interlaced" mode is just a disguised progressive.
No 2-3 pulldown is used with 25/50. Yes, the shutter speed at 50i is 1/50th.

Looking at the spec., it shoots 24p -- which gets 2-3 pulldown -- and 25p which does not.
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Last edited by Steve Mullen; March 7th, 2009 at 01:19 AM.
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Old March 7th, 2009, 03:15 AM   #15
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"
Questions:

1) Not clear to me if the 17.3mm x 13.0mm chip in a four-thirds camera is going to provide the DOF of a 35mm chip.
Of course that DOF will be different. Micro 4/3 is ~ half the size of S35mm frame, 2/3" is half the size of micro 4/3.

Two of the most talked films at the Oscars were shot with 2/3" cameras (Slum Dog Millionaire and "... Benjamin Button". Not to mention the winner :-)

Shallow DOF is not the universal pancea to become a filmaker.
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