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Thread started 16 Apr 2009 (Thursday) 21:12
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Canon 1Ds mark 4

 
Thalagyrt
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Aug 16, 2010 20:26 |  #841

FlyingPhotog wrote in post #10734271 (external link)
There's a good reason most professional edit suites are built around RAID arrays spinning at 10K...

Yup, and you generally want 256K stripes. The various RAID levels are very interesting depending on what you want to do. Some people think RAID 1 is slow, RAID 0 is fast... But for random reads, RAID 1 slays over RAID 0. The more disks the faster you can read too. RAID 5 has the same read speed as 0, but half the write speed because a write is actually two writes in all cases. ;)

6 10K disks with 256KB stripes would be able to handle 250MB/sec. I'm amazed though at how many people use the default 64KB stripe and don't tune it for what it's being used for. Hey, you're dealing with a bunch of 4MB files on this server, why are your stripes 64KB? Dealing with that now. Some people seem to think RAID is all about storage space/redundancy, but that's not all there is too it as you know! :lol:

kcbrown wrote in post #10734297 (external link)
If that's the rate uncompressed, then compressed it would be (on average) about 40 megabytes per second. That's within the range of current CF technology, even if you're talking about targeting a single card instead of striping it across two.

50% is probably a conservative estimate of the compression ratio. I expect that a properly tailored compression algorithm would get significantly better than that.

Anyway, yeah, you'd need extremely good flash media, but we're talking about an $8000 camera here. Canon would have to make it abundantly clear that the feature won't work with anything less than the best performing stuff you can get right now, but aside from that it shouldn't be an issue at all. The guys that would buy an $8k camera to do RAW video aren't going to think twice about the price of the requisite CF cards, since the total package would be quite a lot less expensive than what they're used to paying right now. They'll be ecstatic that it's possible to get RAW video at all.

Like I said, if Canon can pull this off with the 1Ds4, it will fly off the shelves (at least, compared with what you'd expect from a camera that costs $8k). Nikon would be left behind in the dust, and I'm quite sure that Canon would like that very, very much.

Canon's got a lot of incentive to do this, so I won't be surprised at all to see it happen on the 1Ds4.

I wouldn't give that much credit on image compression, unless you're going lossy. The only time I've seen lossless compression actually shrink stuff down to less than around 70% of size is when compressing text with bzip2. Then again, I don't really deal with image compression too much, so I could be very wrong. ;)




  
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kcbrown
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Aug 16, 2010 20:57 |  #842

Thalagyrt wrote in post #10734391 (external link)
I wouldn't give that much credit on image compression, unless you're going lossy. The only time I've seen lossless compression actually shrink stuff down to less than around 70% of size is when compressing text with bzip2. Then again, I don't really deal with image compression too much, so I could be very wrong. ;)

How much space is taken by a 7D frame uncompressed? I'm not sure how to compute the total size of a RAW file from the base pixel resolution. Canon's RAW files are compressed, and the 7D's RAW file size is typically on the order of 22-25 megabytes...


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Aug 16, 2010 20:58 as a reply to  @ kcbrown's post |  #843

when will Canon lower the price of 1D Mark IV ?


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Thalagyrt
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Aug 16, 2010 21:14 |  #844

kcbrown wrote in post #10734574 (external link)
How much space is taken by a 7D frame uncompressed? I'm not sure how to compute the total size of a RAW file from the base pixel resolution. Canon's RAW files are compressed, and the 7D's RAW file size is typically on the order of 22-25 megabytes...

It'd be just a few KB short of 30 MB uncompressed.




  
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Aug 17, 2010 02:12 |  #845

picard wrote in post #10734580 (external link)
when will Canon lower the price of 1D Mark IV ?

I hope not soon. I just bought a 1DIV :) It should hold me over until the 1Ds4 gets is reasonably priced.

1DIV prices shouldn't be affected by 1Ds4 release. Different line of cameras.

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Aug 17, 2010 11:03 |  #846

picard wrote in post #10734580 (external link)
when will Canon lower the price of 1D Mark IV ?

Not soon enough to wait around for it. The 1Ds III on the other hand...:twisted:


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Lowner
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Aug 17, 2010 12:39 as a reply to  @ post 9093803 |  #847

Just seen the latest Canon Rumours CR1 report, I will be very disappointed if its only 30MP and I'm just completely uninterested in the rest:

Full HD video and backlit 29.6MP Digic V
AVHCD
Back lit CMOS sensor effectively doubles the sensitivity of sensor.
6666×4444 pixel sensor becomes the highest resolution 35mm sensor
Back lighting of the sensor improves peripheral performance with ultrawide lenses
Combining hybrid phase difference and contrast detect AF using the main image sensor
High speed phase difference AF and high accuracy contrast detect for high speed AF performance
Hybrid viewfinder. Normal SLR with mirror down or OLED EVF display during liveview mode
5.5FPS in normal mode
7.5MP Liveview mode @30fps
1080/30P and 720/60P


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Aug 17, 2010 12:45 |  #848

Lowner wrote in post #10738395 (external link)
Just seen the latest Canon Rumours CR1 report, I will be very disappointed if its only 30MP and I'm just completely uninterested in the rest:

Full HD video and backlit 29.6MP Digic V
AVHCD
Back lit CMOS sensor effectively doubles the sensitivity of sensor.
6666×4444 pixel sensor becomes the highest resolution 35mm sensor
Back lighting of the sensor improves peripheral performance with ultrawide lenses
Combining hybrid phase difference and contrast detect AF using the main image sensor
High speed phase difference AF and high accuracy contrast detect for high speed AF performance
Hybrid viewfinder. Normal SLR with mirror down or OLED EVF display during liveview mode
5.5FPS in normal mode
7.5MP Liveview mode @30fps
1080/30P and 720/60P

I'll take 30 MP. :)




  
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Lowner
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Aug 17, 2010 12:48 as a reply to  @ post 9093803 |  #849

Julian,

Maybe I would if it offered me other things I want, but honestly that list leaves me cold.


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jdizzle
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Aug 17, 2010 12:51 |  #850

Lowner wrote in post #10738464 (external link)
Julian,

Maybe I would if it offered me other things I want, but honestly that list leaves me cold.

It's still a rumor Richard. Once we get finalization on specs officially via Canon, then CR is just posting fluff. ;)




  
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jdizzle
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Aug 17, 2010 12:52 as a reply to  @ post 9093803 |  #851

I'm curious to know how a backlit CMOS will affect IQ. Anybody know?




  
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Aug 17, 2010 13:28 |  #852

jdizzle wrote in post #10738500 (external link)
I'm curious to know how a backlit CMOS will affect IQ. Anybody know?

It will result in Nikon colors (the punchy/saturated feel). :lol:


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Aug 17, 2010 13:32 |  #853

jwcdds wrote in post #10738751 (external link)
It will result in Nikon colors (the punchy/saturated feel). :lol:

You so silly. :)




  
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Mastamarek
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Aug 17, 2010 14:25 |  #854

Lowner wrote in post #10738395 (external link)
Just seen the latest Canon Rumours CR1 report, I will be very disappointed if its only 30MP and I'm just completely uninterested in the rest:

Full HD video and backlit 29.6MP Digic V
AVHCD
Back lit CMOS sensor effectively doubles the sensitivity of sensor.
6666×4444 pixel sensor becomes the highest resolution 35mm sensor
Back lighting of the sensor improves peripheral performance with ultrawide lenses
Combining hybrid phase difference and contrast detect AF using the main image sensor
High speed phase difference AF and high accuracy contrast detect for high speed AF performance
Hybrid viewfinder. Normal SLR with mirror down or OLED EVF display during liveview mode
5.5FPS in normal mode
7.5MP Liveview mode @30fps
1080/30P and 720/60P

I'll take that!! specs look good. Also its hot AVHCD, but AVCHD. lol. but looks like canon is changing codes which is sweeet.
but that digic5 spec looks weird. so they re gonna completely skip digic4!? lol. I guess it just shows how much 1Ds3 needed an updated.


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waving_odd
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Aug 17, 2010 15:13 |  #855

jdizzle wrote in post #10738500 (external link)
I'm curious to know how a backlit CMOS will affect IQ. Anybody know?

http://www.dpreview.co​m …0908/09080601so​nycmos.asp (external link)

"...back-illuminated CMOS image sensor with improved sensitivity and noise reduction - the key factors to enhancing image quality..."

You know it's always subjective when it comes to IQ definition...


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