-= 5D Mark IV owners unite! Post photos and discuss.

CyberDyneSystems wrote in post #18802626
With certain lenses, this is true, although it's not the biggest difference. The larger difference is the processioning power making the differences in how fast the calculations are made. That the 1Dx burst rates are so much faster than the 5D bodies = a much faster more powerful processor to make those 10-14 fps calculations.

Here is a quote from Chuck Westfall (rip) describing the differences between the 5D3 and 1Dx, another pair with the "same AF system" but with different capabilities from each.

"Lens drive speed: Because of its higher voltage battery, the 1Dx can supply an initial burst of power to select L-series USM telephoto lenses that drives them twice as fast as normal for the first second of operation. The 5D Mark III can't do that because its battery is lower voltage, and also because the camera body is not designed to accept higher voltage even if it was available."

Thanks for the explanation, Jake. It's easy to know (when you have both bodies) to say that the 1DX2 is superior to the 5D4 but it's harder to explain when one doesn't know the technical differences.

SYS wrote in post #18802656
My apology, I thought I had responded to your inquiry a day or two ago but I don't see my post in reply. In any case, yes, it was with my Siggy. For the price, it's quite able lens.

No problem, Sys. Looks like you have it dialled in pretty good!

Itsed65 wrote in post #18802679

IMAGE LINK: https://flic.kr/p/23SY​Uhr
Arooo! Times Two by lennycarl08, on Flickr

Wow...I really like this shot, Ed...Very, very nice.

Lame-Duck wrote in post #18802945
Wow...I really like this shot, Ed...Very, very nice.

Thanks! I have about a hundred shots of these two! I'm pretty sure they are sibling pups. I had both my 5D4 and A9, and they were running around playing and wrestling, and then they would stop and start howling. It was so fun to watch and hear!

Itsed65 wrote in post #18802679

IMAGE LINK: https://flic.kr/p/23SY​Uhr
Arooo! Times Two by lennycarl08, on Flickr

Nice work!!!!!!!!!!!!!!! That had to have been fun to watch!

Sdentrem wrote in post #18799047
Sunrise at the beach. Martinique, Nova Scotia, Jan 26th. Note the rock that looks like a half-buried sperm whale.

Hosted photo: posted by Sdentrem in
./showthread.php?p=187​99047&i=i233882647
forum: Canon Digital Cameras

It even has the eye!!

amairphoto wrote in post #18800053
That's a great age to start with the Strider!

A big critique would be why black? It's such a dark background for a fun subject.

That's a great shot! IMHO, increase f-stop to 8 or ish, that will blast that background totally black. Great results!!

fordmondeo wrote in post #18801295
I bought a 5d4 a couple of months back and it pretty much does what it says on the tin however..........

I was led to think it had the same AF system as my 1dx2 but it really does not seem as quick or reliable when used with like for like lenses.

Is it just me or is the 1dx2 known to be quicker?

My 1DX-II is faster for AF and never misses, but... my 5DIV has a lot of resolution if you need it in a crunch. Great complimentary bodies.

amairphoto wrote in post #18801508
I think for the time it was released, the mkiv had a pretty crappy af system.

?? compared to what???

CyberDyneSystems wrote in post #18802626
With certain lenses, this is true, although it's not the biggest difference. The larger difference is the processioning power making the differences in how fast the calculations are made. That the 1Dx burst rates are so much faster than the 5D bodies = a much faster more powerful processor to make those 10-14 fps calculations.

Here is a quote from Chuck Westfall (rip) describing the differences between the 5D3 and 1Dx, another pair with the "same AF system" but with different capabilities from each.

"Lens drive speed: Because of its higher voltage battery, the 1Dx can supply an initial burst of power to select L-series USM telephoto lenses that drives them twice as fast as normal for the first second of operation. The 5D Mark III can't do that because its battery is lower voltage, and also because the camera body is not designed to accept higher voltage even if it was available."

20MB pdf covering interview with developers for the new V3 super teles. While discussion in this thread has not been about the new lenses, it's interesting to hear some of the factors that relate to AF speed.

Interviewer: I see, it seems that you’ve achieved high-speed AF.
Nagao: AF speed involves both the fastest focus motor drive speed capable on the lens, and the focusing calculation time on the camera. In bright situations, the focus drive speed of the lens is dominant, and I believe this is why you can see AF speed improvements on the III series 400mm and 600mm super-tele lenses.

Interviewer: What was the key technology for improving AF performance?
Ichinose (Electrical Design): A major point was including the latest microprocessor for improved calculation speed, which also raised the AF control frequency. Although it differs depending on various conditions, this resulted in improved subject tracking during AI servo AF. More microprocessor cores result in smoother parallel processing.
For example, AF performance can be maximized even when the IS mechanism is on. The power management function has been modified for real-time, accurate detection of power used by AF to draw out the maximum performance of the ultrasonic motor (USM). Strictly speaking, this relies on the AF performance of the camera body. However, both the EOS-1D and EOS 5D series benefit from improved AF performance when used with the III series lenses.

http://downloads.canon​.com …iew__CUSA__11-26-2018.pdf

She's posing for her portrait.

Quality time with dad!

CyberDyneSystems wrote in post #18801549
That said, for me, the 5D4 is the second best AF of any Canon DSLR ever made.

I'm curious if anyone has compared the AF performance of the 5D4 with the 7DII, for moving subjects?