Which UDMA cards are you getting?

Nah. I haven't. Been shooting with them for over a month. But the UDMA card is new so I'll have to check.

Honestly. I just don't expect much to begin with so I take what I can get. Banding isn't something I worry about if it's nit abhorent. And it hasn't been noticable on anything important. For me anyway.

I'll
keep an eye out. Heading to second location Now.

Mkii is definitely fast as hell.
 
Barry_Green said:
It doesn't know or care how fast the card is. The buffer's job is to write the next "sector". It tells the card to write, and asks it for confirmation that it's written. It then moves on to the next sector, etc. Assuming that there's some asynchronous handshake protocol in there, which I can't fathom that there wouldn't be...

So anyway, this theoretical buffer writes as absolutely fast as it can, limited only by the card's transfer speed. So the camera hands the buffer a new GoP every half a second, and the buffer writes out its contents to the card as fast as possible. In an ideal world the buffer would never even fill up because the buffer would be spewing data out to the card as fast as or faster than it was receiving it. But the whole point of having a buffer would be for the times when the card, for whatever reason, WASN'T fast enough. So instead of having a big hiccup or glitch in your footage (ever seen a dropout in HDV? It's horrible!) the system should have some sort of buffer in place on a tapeless system, to avoid that situation.

Again, this is total speculation from an ex-programmer. I could be completely wrong in all this; I just think it makes sense and I'd be very surprised if there wasn't some sort of protection to avoid dropped-GoP issues like happen on HDV tape.
Click to expand...

Not completely wrong at all...

From the Canon 7D instruction manual:

"If you use a card having a slow writing speed, a five-level indicator might appear on the right of the screen during moving shooting. It indicates how much data has not yet been written to the card (remaining capacity of the internal buffer memory) The slower the card, the faster the indicator will climb upward. If the indicator becomes full, movie shooting will stop automatically."
 
I would be very surprised if ANY 20MB/s cards have issues on with a 9MB/s rated camera!
A tad over 200% requirement people... Kingston 133x will be safe, period. If it isn't then you are a little more than 200% entitled to a replacement!

Anything beyond a "healthy" (up to YOU) overhead is only for benefits in RAW bursts... I mean, shouldn't that be the end of the question? It is as straight forward as could be.

You guys are needlessly worrying me! :huh:
 
Kholi said:
How would you test this?

I've got a Kingston 8gb 133x and 16gb udma 300x card
Click to expand...


Slow to mid speed pans with very deep dof and high lightning ratio (say pan thru a room, walls correctly exposed-highly clipped windows-walls again) is something that cause me (5D) problems most of the time. 1 frame holds for 2/4 when the burned window enter/exit the frame.
I'm using cheap no brand 233x cards.
Please keep posted if you find there's a difference
 
Alvise Tedesco said:
Slow to mid speed pans with very deep dof and high lightning ratio (say pan thru a room, walls correctly exposed-highly clipped windows-walls again) is something that cause me (5D) problems most of the time. 1 frame holds for 2/4 when the burned window enter/exit the frame.
I'm using cheap no brand 233x cards.
Please keep posted if you find there's a difference
Click to expand...

OMG, have I been missing these posts? Is this a known and common problem with the 5D? I have only come on to DSLRs now that the 7D came out. Can someone tell me if this is a widespread issue with the 5D and "bad" cards?
 
USLatin said:
OMG, have I been missing these posts? Is this a known and common problem with the 5D? I have only come on to DSLRs now that the 7D came out. Can someone tell me if this is a widespread issue with the 5D and "bad" cards?
Click to expand...

I'm having problems. Apparently there isn't much complaint on this specific problem. Maybe just a very small percentage of faulty cameras, I can't really report other than my personal experience.

Better explained here (see also link to dpreview forum post)
http://blog.planet5d.com/2009/03/5d2-video-stuck-frames/
 
Alvise Tedesco said:
I'm having problems. Apparently there isn't much complaint on this specific problem. Maybe just a very small percentage of faulty cameras, I can't really report other than my personal experience.

Better explained here (see also link to dpreview forum post)
http://blog.planet5d.com/2009/03/5d2-video-stuck-frames/
Click to expand...

According to that link it's a problem that occurs from the camera controlling the aperture. By the sound of things it shouldn't happen in manual mode. Doesn't appear to be anything to do with the CF card.
 
I had frozen frames on my rented 5D a few times. Put me off using it for a paid job. Doesn't seem to affect most people, though.
 
Rough Cut said:
"If you use a card having a slow writing speed, a five-level indicator might appear on the right of the screen during moving shooting. It indicates how much data has not yet been written to the card (remaining capacity of the internal buffer memory) The slower the card, the faster the indicator will climb upward. If the indicator becomes full, movie shooting will stop automatically."
Click to expand...
Hah! Excellent. Thanks for posting that!
 
Yea, I didn't see that in my copy of the Owner's Manual. TYVM! I'm still confused by two things in this quote: "stop automatically" isn't brown out and degraded performance; and "slow writing speed" would be something under the 8MB/s they spec...right? Again, the 133x non UDMA Kingston performs well above their specified minimum requirements.
 
The salesman at the shop recommended the Lexar 300x UDMA cards. They have a pretty nice rebate ending today, so I picked up 2 - 8Gigs for $85 after rebate. Using a sandisk III right now and it seems just fine. No problems yet and haven't noticed any significant banding, although it's only been 1 day.
 
tim joy said:
the salesman at the shop recommended the lexar 300x udma cards. They have a pretty nice rebate ending today, so i picked up 2 - 8gigs for $85 after rebate. Using a sandisk iii right now and it seems just fine. No problems yet and haven't noticed any significant banding, although it's only been 1 day.
Click to expand...

thank you 4 posting this !
 
ryansheffer said:
Been using my 32GB 133x Kingston's for the last day without any issue of drop outs or strange banding. Will compare to a UDMA card today, but I really don't think UDMA is necessary at all.

I have two of these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820134901&Tpk=32GB kingston CF
Click to expand...

Thanks. Let us know if it holds strong.

Could you test highest quality RAW still bursts? I am curious to hear how long it takes for it to be ready again after the buffer is full.
 
USLatin said:
Thanks. Let us know if it holds strong.

Could you test highest quality RAW still bursts? I am curious to hear how long it takes for it to be ready again after the buffer is full.
Click to expand...

You mean.... you're going to take PHOTOS with this camera?

You must be crazy!

(All kidding aside, I'm VERY excited about taking photos!!)
 
I just got the canon 7D and tried a 1GB 140X Compact Flash from GXT Digital pro. I can see the right side levels go to 2/5 and when I do a rack focus it jumps to 5/5 buffer full. Then the recording stops.

I guess Kingston 133x wont do the job either. I will have to go UDMA. But there is a trick out there. I thought I would share:

You can use this portable drive that automatically transfert cards clips on the hard drive without a computer.

Nexto eXtreme (160GB) 234$ US
 
Loic said:
I just got the canon 7D and tried a 1GB 140X Compact Flash from GXT Digital pro. I can see the right side levels go to 2/5 and when I do a rack focus it jumps to 5/5 buffer full. Then the recording stops.

I guess Kingston 133x wont do the job either. I will have to go UDMA.
Click to expand...



Not necessarily true. I have Promax 266x 16GB and see 2/3 buffer lights.
I didn't see any with Transcend 133x 16GB
Guess what, Promax are cheap, no brand, and sell a speed that isn't there
 
Loic said:
I just got the canon 7D and tried a 1GB 140X Compact Flash from GXT Digital pro. I can see the right side levels go to 2/5 and when I do a rack focus it jumps to 5/5 buffer full. Then the recording stops.

I guess Kingston 133x wont do the job either. I will have to go UDMA. But there is a trick out there. I thought I would share:

You can use this portable drive that automatically transfert cards clips on the hard drive without a computer.

Nexto eXtreme (160GB) 234$ US
Click to expand...


Guess is wrong. I've been using Kingston 133x with the 7D and 5D and experienced nothing negative that I can see. I'll scrub for banding, but I definitely didn't get a stopped recording or anything like that. This is with video. Dunno about still bursts.
 
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