Official: Canon 1D Mk IV

I guess time will tell. As more people work with these.

I just grabbed some focus tests in my theater room which is lit by a 100 watt projector bulb. The 135 & 16-35 worked fine...quick & accurate.

My gyms are dark....but not this dark!

GBRandy wrote in post #9511993
It's cold out so what the heck. I went down by computer and shut all the lights off. The area is lit by an adjoining rooms light coming through an open area. It was pretty dark in here.

I grabbed my 85 f1.2 and cranked the ISO to 12800 on the MKIV.

It focused fine. The only thing it struggled with was in ROF. From time to time it seemed to find the lights on my NAS before the black camera bodies.....

But really....did I mention the lights were off?...as I was in the dark doing this at f1.2? If the AF was missing the DOF at f1.2 would show it....it was just fine for me.

I just looked at your settings. You were shooting in light with an EV of -0.57. That's negative 0.57 EV. That's pretty doggone dark. I'm guessing that it'll AF even lower than that, but it will be pretty slow.

Negative light? Is there an absolute zero like temperature? Sounds like string theory where someone on TV once said that anyone telling you they understand it, has not grasped it at all.

radiohead wrote in post #9511366
Picked up on a Tweet from Fake Chuck Westfall

http://jgphotography.c​a/blog/canon-1d-mark-iv-review

Now, that doesn't match anything I've read anywhere or from any wedding shooter with a 1D4.....

I'm not quite getting that one - "the 1D IV is better than the 1D III in low light" but it's not as good as the 5D2? My 5D2 is almost exactly the same as the original 5D was, and my 1D3 was better than the 5D in low light AF. So if the 1D4 is better at low-light AF than the Mk III, then it has to be better than the 5D2.

I'm certain that he only tested the center AF point on the 5D2 because the others are weaker than the center. Admittedly, the 5D2 and 5D are strong in low light with the center AF point. Maybe a little slow, but very sure. The center AF point is better than the center AF point on the 7D, but the peripheral AF points are not as good on the 5 series.

Lowner wrote in post #9512616
Negative light? Is there an absolute zero like temperature? Sounds like string theory where someone on TV once said that anyone telling you they understand it, has not grasped it at all.

It's not negative light - the EV scale goes below zero. For example, the 5D2's AF is rated sensitive down to -0.5 EV, and the 1D4 is rated sensitive down to -1.0 EV.

This looks to be a great camera!

Well...

radiohead wrote in post #9511366
Now, that doesn't match anything I've read anywhere or from any wedding shooter with a 1D4.....

...There is a reason for that.

I could not laugh more when he first mentions "1D3 AF fiasco"... and then, down below, he mentions how wonderful his 1Ds3 AF is...

It says it all to me. No need to read any further.

PIX

FretNoMore wrote in post #9511815
I don't need to hear anything; I need to try for myself. It doesn't matter what other people find out from their camera, I need my copy to work for me, in my shooting situations.

I agree.
That's why I'm renting the camera for as soon as the sun starts coming out later this month. Once I test it out I'll know if it's the one for me. I'm sure it will be hard to send it back though. lol

I'm glad I tested out in my hands a 7D too, helped me decided to wait.

I just shot this in a VERY dark room. I am in my office with the lights out. I have 3 monitors on my computer (which you can see in my cats eyes). I used my 85L and my 1D4. This is ISO 12800 and f/2.5.

no way!! that cant be 12800!!!!

nope, still refuse to believe ^^ you could have photo-shoped those digits I'm sorry but that's just not 12800. lol

EDIT:
I think ISO 200 on my rebel Xti looks worse. lol.

Nice..... I assume JPG...and if so, what do you have the CFII-2 set at?

tharmsen wrote in post #9513968
I just shot this in a VERY dark room. I am in my office with the lights out. I have 3 monitors on my computer (which you can see in my cats eyes). I used my 85L and my 1D4. This is ISO 12800 and f/2.5.



The AF system nailed the AF very quickly. My 5D2 couldn't do it with an outer point but did it with the center point. The 5D2 is much slower, the 1D4 instantly locked. I should also note that this wasn't shot with the center point on the 1D4... I love having 39 cross type sensors that are all evenly matched!

The D3 really stinks in low light. I've used them, and they hunt around and miss focus, or just never lock. The D3's AF system really isn't all that great. It works ok in daylight, but forget about it at night. If you want to increase your keepers with a D3, use your center point. But then you could just buy a 5D2 and do the same thing and save yourself a couple grand.

This from a portrait/ wedding guy who never could nail the focus consistently with 20 D,
30 D, 40 D, 50 D, and 7 D...this camera is a dream. I got the camera on Tuesday, and have been amazed by the AF. In all kinds of light, and all sensors. I got hundreds of dead on focus shots using my mercurial rat terrier as a model. Today I did an engagement session, and everything was tack sharp at f1.2.

Mastamarek wrote in post #9514026
nope, still refuse to believe ^^ you could have photo-shoped those digits I'm sorry but that's just not 12800. lol

EDIT:
I think ISO 200 on my rebel Xti looks worse. lol.

Can't really tell all that much from web sized images.
I think it should be pretty close to the 5DMKII, no?