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 p.1 #18 · R1 CFexpress Type B cards | |
dolina wrote:
As the conversation has progressed I considered other people's PoV, learned something new and adjusted accordingly.
I suspect many persons replying to me are using RF L lenses with their R1 so they really need >1GB/s min sustained write speeds and the need >3GB/s min sustained read speed because they're using 1-2TB cards so I had to explicitly mention I was still using EF lenses. This bottlenecks me to <1GB/s cards.
Another would be how much storage I'd use. I'd struggle to fill it over a long weeend before I need to swap out a battery.
If the R1 proves me wrong then buy a better card and use what I bought as a backup.
Anyway, thanks for everyone's feedback. Wish I bought this 1st 6 months of availability....Show more →
I don't believe any of the current Canon cameras write anywhere near 1GB/s to CFe. I recently did some tests with the R5II to determine buffer capacity at 30fps and write throughput speed. I'd have to dig it up, but I don't think write surpassed around 500MB/s on average, but I have no way of determining if the cameras have a certain sustained write speed or if they write in faster bursts interspersed by pauses or slower speeds.
dolina wrote:
These are the data throughput per lens + R1 for photos
- RF Lens-only can easily do 40fps @ 1.1GB/s RAW or 500MB/s C-RAW
- EF 400mm f/2.8L IS II USM caps @ 30fps ~825 MB/s RAW or ~375 MB/s C-RAW
- EF 800mm, EF 500mm, EF 200mm f/2.0 caps @ 20fps ~550 MB/s RAW or ~250 MB/s C-RAW
What is the source for these numbers? I'm only asking to better understand this aspect of e-shutter performance. I've read a few comments over the years that old EF lenses (pre 2010-2012) may slow down e-shutter, but never saw concrete numbers stated. The EF lenses I still use, such as 85/1.4L IS and 200-400 are in the most recent and most compatible category when adapted to RF and I have not noticed frame rate decrease on the R1, R5II or R6II. That said, I also have not tested to confirm they actually hit maximum the frame rates of each camera.
With regard to going with many smaller cards vs. a few larger ones, I wasn't really saying one approach was better than the other. Each has advantages and disadvantages and will probably depend a lot on personal preferences.
You generally will pay more for smaller cards than larger ones, on a per GB basis and some smaller capacity cards are slower than larger versions in the same product line, due to how speed sometimes scales with the number of memory chips, allowing parallel read/write in larger capacities. While you're often managing more cards when dealing with smaller capacities, and this can result in loss, theft, etc., of individual cards. When something like that does happen, to lose a smaller segment of a total shoot would be preferable over losing all or most of a shoot. At least from one backup set because you should at least have two.
What I have done in the past, if not lugging around a laptop and external backup drives, is to each day or each event, safekeeping the mirrored card and in-camera, using its image copy features, to write the day's or event's contents to a second back up card. Usually it would be a larger capacity card that would carry multiple days or events worth of images, strictly as a second back up.
A downside of huge cards, and filling them with tens of thousands of images, is that it can affect certain aspects of camera performance. Start up and ready time can be delayed because the camera 'polls' the cards to determine the contents and available space. The more files on a card, the longer this will take. In this respect, 128GB cards might be better. With the R6II, I frequently shot large events to dual 256GB cards, which would hold about 16-18,000 CRAW images. And this definitely impacted start up times, like when I would have to change batteries at suboptimal times and then have to wait through a longer start up process before the camera would be ready again. Some of this delay would be reduced by the faster performance of CFe in the R1 compared to SD in the R6II. Both are 24MP cameras and I'd think you'd get around 10,000 CRAW images on a 128GB card. The most I ever shot in one go with the R1 was around 22,000 to 500/512GB cards and I don't recall if the start up time was affected much. It's definitely not an issue during use, but if you routinely turn off the camera between uses, it might be a factor.
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Canon was very forward thinking with the EOS system.