This is a bit of a simplistic explanation, but here goes....
I remember someone saying change the card slot to SD....the worse idea I've head this thread, cf all the way I want my buffer clear asap....
also usb3 or better yet gig Ethernet jack to get my files off.
I can't see GigE connectivity on a camera.... consumers like wireless... the throughput of wireless is laughable compared to GigE, but wireless is more convenient... so the poorer solution wins... USB3 has to come soon, at some point people will stop making chipsets that only go up to USB2... USB will win out over Ethernet because all you have to do is plug it in.... no configuration required, and a lot of people use laptops and tablets with no wired Ethernet connection... USB is a more universal solution than wired Ethernet.
I can't speak from experience, as I haven't made the leap yet, but I understand 802.11ac is actually starting to approach the real-world throughput of gigE. While I doubt they'd put an ac antenna array in the 7d2 for space and power reasons, they COULD get the throughput if they wanted.
Also, given that Apple's target market for laptops correlates pretty strongly with pro and prosumer camera buyers, I think a thunderbolt / USB3 combo would be awesome- USB3 for PC users, TB for mac...
There are two basic types of network traffic, on type is where you set up "a pipe" and the data automatically streams down the pipe from one device to the other, the other type of data flow is a send/acknowledge data flow.... something like "here's a bit of data", answered by "I got it.... send me another"... and so on.. Most network traffic tends to be send/acknowledge and it takes time for the requests and acknoledgements to fly back and forth so the flow of data is slow.
When you connect with wire, data can flow both ways at once and this greatly speeds up the send/acknowledge protocols. On a wireless link you can only go one direction at a time and it takes time to turn the link around... plus you can have interference on wireless which causes re-transmissions and further slows things down. Processing of the data is faster on wire than wireless so there is less delay there too.
All this adds up...
In the end, you find out that it takes almost the same amount of time on a wireless link to move 20 bytes of data as it takes to move 1400 bytes of data so if you want any decent kind of throughput you need to be moving huge blocks of data in one direction and small amounts the other way..
Marketing people have a different perspective.... they compare the most favourable conditions of a wireless link to the least favourable conditions on a wired link... and that's how they come up with claims to be "almost as fast"
As a photographer, I suggest you do your own test... transfer a bunch of photos from a laptop to a computer over a wireless link, and then repeat the process over a wire link... send some tiny Jpgs and then try some RAW files and see the difference it makes to you on your gear...
I’ve written it before, and I’m repeating it here again – I really appreciate many of your posts on Canon Rumours forum, Don.
Thanks to you and many others (of course Dr Neuro deserves thanks as well for his great technical insights)
Your post above is spot on: technically accurate and helpful. I find that I rarely use wireless – though it can be handy at times (eg quick connect of laptop for 2 minutes). However for serious internet usage, data transfers, I stick with wired connections. So much faster and predictable (and I find, also more secure – ie less possibility of the occasional wireless drop-outs).
I have undertaken ‘tests’ of file transfer speeds for many years: using tiny JPEG vs large files (eg RAWs) and even vs much larger video files. I have done this to test HDD to HDD transfers, USB (back in the days of USB1.1, USB2.0 and now USB3.0. USB3.0 definitely ‘rocks’! I remember when I thought USB2.0 was ‘blazingly fast’… lol.
I’m looking forward USB3.0 being the new normal standard for all devices and hopefully included on the 7DmkII.(that might be my next camera, but in the meantime – I’m very happy with my Canon 7D. The CR1 rumoured spec list for the 7DmkII looks good (maybe too good to be true) – but I trust Canon will put out a winner when it does!