April 20, 2014, 10:17:10 AM

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - dolina

Pages: 1 2 [3] 4 5 ... 52
Animal Kingdom / Re: Show your Bird Portraits
« on: February 02, 2014, 03:30:04 PM »
lion rock I do hope your camera insurance covers accidents.

Canon EF Prime Lenses / Re: Canon EF 24mm f/1.4L II USM
« on: February 02, 2014, 04:59:21 AM »

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: February 02, 2014, 04:58:56 AM »
I account for overhead. SATA 6Gbps would be 768 MB/s but no SSD I know off can consistently hit 600MB/s whether read or write.

Serial ATA International Organization interpreted 16Gb/s of SATA Express to 2GB/s. I would more likely believe 1.6GB/s to cover overhead.

I am also speculating where future unannounced versions could lead to.

XQD and CFast are based on PCIe and SATA technologies. As such are restricted by the same limitations. Like SATA rev 3.0 peaks at 600MB/s and PCIe rev 3.0 peaks at 800MB/s.

You're being a little imprecise there.  PCIe peaks at 985 MB/s of bidirectional bandwidth per lane.  However, PCIe allows you to aggregate (bond) up to 32 lanes.  An x32 PCIe bus, therefore, maxes out at almost 16 gigabytes per second in each direction.  Mind you, XQD currently provides only a single lane, but you could trivially turn it into a much faster standard just by throwing enough additional pins at the problem (four extra pins per lane, ignoring any ground pins that might be required to prevent crosstalk).

For a data card standard, unless I'm missing something, you could easily do away with all but three of the first 22 pins in the PCIe standard (the two SMBUS pins and one 3.3V rail).  The next 14 would probably be required, though perhaps not all of the grounds.  So you're at about 17 pins for the first lane, and possibly fewer.  If you then add more lanes using the same ground-opposite-data scheme that PCIe connectors use, add 8 pins per additional lane.

So if you used the same 50-pin connector that CF cards use, for example, you ought to be able to do 4x PCIe with nine pins to spare (assuming that you either require everything to do 4x or require the mode to be negotiated over the SMBUS instead of using detect pins).  If you use those nine pins as detect pins in some particularly smart way, you might even be able to achieve backwards compatibility with CF in both directions....

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 05:00:40 PM »
Rereading it appears that SATA Express uses PCI Express to achieve 16Gbit/s throughput.

Perhaps this is why everyone but Sony & Nikon abandoned XQD.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 04:12:38 PM »
Canon cameras not memory cards. ;) Unless of course ARRI and Phase Ones also make their own memory cards.

The limitation is indeed the mirror hence Canon going TLR-like.

Or as you mentioned a global shutter would work as well.

1DX benefits from the buffer and UDMA 7 CF cards.

I didn't think Canon manufactured memory cards. Maybe rebranded, sure.

Anyway, I thought part of the limitation on FPS was the shutter & mirror. I'd think that on a 1DX they have pretty big memory buffers, yet they can't speed up the shutter. If they actually can get a real global shutter on the next line of sensors, they could really pump things up as they would no longer be reliant on physical mechanisms.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 04:06:25 PM »
Amusing thread.

Fir of all, if it is a Q3 release, my vacation at the end of Q2 beginning of Q3 will have to live with the 7D and 50D I currently own, and that sucks.

Secondly, if it is a Q2 announce and Q3 release, prototypes are not a word used at this point. There might be some firmware changes between cameras. But these would be Beta or pre-production cameras.

As far as problems writing to the CF cards, those issues should be long found in regression tests and such. I would hope. I would expect bugs will be a minimum, there will be some. But I would also expect any photographer to have a few 1000, or more exposures on any new camera before they head to the sporting event, no?

Like seriously, who would grab a new camera and the start taking event pictures, unless you absolutely had to??

just say'n.

I have been in production development for a while now, and unless Canon is an absolute broken mess of a large corporation, I would expect there is significantly less risk with than some of y'all think. I have to expect these cameras have already been vibe-table tested with accelerated aging tests, temp testing for both environmental use, but again accelerated aging tests, regressions tests, life tests and so on.

Often times it is a job requirement imposed by the photoagency or directly with Canon itself.

Any who SATA Express and PCIe 4 (both 1.6GB/s) will come out by 2017 with Intel Skylake.

2017 4K resolution 32-inch iMacs anyone?

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 03:07:38 PM »
From what I've read Sandisk, Arri, Phase One, Lexar and Sandisk support CFast 2.0.

XQD was developed by Sandisk but not manufactured by them. Lexar and Sony are the sole XQD memory card makers and Nikon D4 the sole camera supporting it. Some months ago BH Photo claimed that Lexar discontinued XQD but Lexar rebukes this.

Only XQD you can buy off BH is from Sony.

CFast is not available on BH as of my writing.

My thoughts are the next 1D, 5D and possibly the 7D will support CFast if they start allowing uncompressed video straight to internal memory card or 4K resolution recording.

CFast would also be required if Canon were to adopt a TLR-like technology to attain higher continuous RAW fps. As I see it memory card read/writes are the main culprit holding back cameras.

XQD and CFast are based on PCIe and SATA technologies. As such are restricted by the same limitations. Like SATA rev 3.0 peaks at 600MB/s and PCIe rev 3.0 peaks at 800MB/s.

Next step up has both CFast and XQD peaking at 1.6GB/s. I think they will be updated once 8K resolution recordings become popular. In say 5, 10 or 15 years from now?

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 02:24:04 PM »
Alternatively Canon could go SDXC like what was done to the 60D and 6D. SDXC Version 4.0 allows for 312 MB/s using additional row of pins..

What I should be my worry now is to make sure the 5 CF cards are sold and I find the other 5 cards that I need to sell.

I really just want to have one memory card per body to keep things tidy.

Don't forget that CFast is Canon's preferred card format that they've been publicly backing - they'd be crazy to suddenly use XQD, especially since Nikon only has one camera that supports XQD so far, but Alexa is already supporting CFast via standard upgrades for most of their cinema cameras.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 01:57:15 PM »
If they're giving it out to pros, it'll be CFast. Or XQD. I haven't really looked at which one is superior, if either one really is. XQD is based on PCI-Express, while CFast is based on SATA. Either way, while they both support extremely high max speeds, those speeds will only be reached by very few cards, if ever. Until we get new technologies past flash memory. It's getting harder and harder to boost flash speeds, especially in such a fairly small & confined space. With current top end cards just starting to hit UDMA7 max speeds, XQD/CFast support is definitely needed on the next generation of pro cameras.

No one has max'd out CFast or XQD yet but they've surpassed UDMA 7 CF's 167MB/s limit.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 11:22:40 AM »
To be honest I was expecting the announcement for the 7D and 1DX replacement to have been made last October 2013.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 10:17:10 AM »
Canon lends out their prototypes to photoagencies and photogs they closely work with. Best time to organize such a test under real world conditions are at international sporting events like the World Cup and Olympics.

Canon & Nikon have both been doing this for decades to good effect.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 09:44:28 AM »
So it won't work with existing CF cards, might as well throw all of my existing CF cards in the garbage if they change it.
I'm selling my collection of thirteen CF cards of 2GB or larger. Sold three and and pre-sold five. The rest I need to look for as they are scattered in the house.

Original plan was to replace them with four 64GB or 128GB cards. I hate keeping track of so many loose items that I do not end up using. Why four CF cards? That makes it one body to one card.

Reading up on Sandisk, Lexar & Canon's involvement with CFast (and further readings on XQD) got me thinking that 2014 could be the year that we will see EOS bodies with SATA-based CFast card slots.

Too many eggs in a single basket? That has been the argument since over a decade ago. Never had a memory card go bad on me but misplacing them is always a problem.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 09:12:35 AM »
This is another useless CR1 7D2 thread to add to the already existing ones...

I wasn't thinking quite that harshly but I was thinking along the same lines. Nothing new people, just another "look 7D2" moment lol
Not everyone visit CR every day folks. ;) A reminder is always welcome. It got me to check on the shutter life of my 4 bodies.

EOS Bodies / Re: Canon EOS 7D Mark II in Q2? [CR1]
« on: January 31, 2014, 08:14:55 AM »
What I want to know is what memory cards will it be using. Will Canon still stick to UDMA 7 CF (167MB/s) or switch to UHS-II SDXC (312MB/s) or CFast 2.0 (600MB/s).

It has been more than 53 months since the 7D was announced to the public.

Canon EF Prime Lenses / Re: Canon EF 800mm f/5.6L IS USM
« on: January 29, 2014, 12:27:21 PM »

Brown-throated Sunbird (Anthreptes malacensis) by alabang, on Flickr

The Grey-throated Sunbird (Anthreptes griseigularis) is a species of  bird in the Nectariniidae family. It is found in a wide range of  semi-open wooded habitats in the northern and eastern part of the  Philippines. It is often considered a subspecies of the Brown-throated  Sunbird, but the two differ consistently in measurements and plumage,  and there is no evidence of intergradation between them.[1] It has not  been rated by BirdLife International (and consequently IUCN), but is  generally common and therefore unlikely to be threatened.

Source: http://en.wikipedia.org/wiki/Grey-throated_Sunbird

Location: http://en.wikipedia.org/wiki/Mount_Makiling

Settings: 1/100 ƒ/6.3 ISO 1250 800mm

Pages: 1 2 [3] 4 5 ... 52