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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 07 Apr 2012 (Saturday) 10:58
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miscellaneous 5D MKIII questions

 
Delivery ­ Man
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Apr 18, 2012 09:06 as a reply to  @ post 14285976 |  #16

In reference to your question about erasing images, I asked the same thing in another thread a few days ago and it appears that we have delete images from the second card separately, images are only removed from the card set for playback on the initial delete. No one pointed me to a custom function to override this.


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Digital ­ Panda
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May 06, 2012 22:23 |  #17

I'm interested in learning how to delete the pictures on both cards as well.


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Delivery ­ Man
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May 07, 2012 08:14 as a reply to  @ post 14285976 |  #18

After my previous reply which was in reference to deleting images directly in camera, I discovered that the software that comes with the camera makes it easy to clean both cards. After you download the images you want while in EOS Utility you can select either card 1 or 2 and delete some or all images from them with one click.


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modchild
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May 07, 2012 10:37 |  #19

What flashgun did you have on, have you set for the AF assist beam to fire from the speedlight to help in flash control. I'm not sure if it would of made a difference but every little helps.


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BHollis
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May 07, 2012 10:45 |  #20

magwai wrote in post #14225986 (external link)
I hope OP doesnt mind, but I have a similar question. Does anybody know how to find out what AF function you get with a non-Canon lens? In particular I am interested in the sigma 85mm f1.4 if anyone knows.

I get all the same focus points/functions with my Sigma 85 as I do with my 35L. Getting excellent AF results with my Sigma 85.


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timnosenzo
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May 07, 2012 10:55 |  #21

Gregg.Siam wrote in post #14225352 (external link)
1. I was shooting at a car show tonight and noticed the AF was really slow in a few spots where the light was not so good. It's had hard shadows and the light was not uniform. At the time I was using all 62 points of the AF; the lens was the 24-105 (new lens), I was in M mode, and using external flash. The AF literally took over a full second to lock on to anything. It happened many times in this spot. I didn't have the mindset to look at the focus confirmation light at the time.

Myself and others have noticed the same in low light using AF assist

https://photography-on-the.net …/showthread.php​?t=1179971

I tried using the AF Point Expansion mode during the wedding I shot on Saturday and it actually seemed to help a bit. I don't think I would use it for portraits or where DOF may be too shallow.


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petiot
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May 07, 2012 11:17 |  #22

mrgooch wrote in post #14225773 (external link)
Why would't you just bump up the ISO? That's what it's for.

Unless i have totally misunderstood the technology behind digital photography, I really don't see how high iso can possibly improve AF (conventional AF, not sure about the phase detection). It is definitely not "what it is for", high iso only increase the image sensor sensitivity to light.

I beg someone to correct me if I am wrong, because I feel that there is an increasing number or totally flawed statements and analysis in this forum, and it is in everyone's interest to correct those.


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timnosenzo
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May 07, 2012 11:18 |  #23

petiot wrote in post #14393234 (external link)
I beg someone to correct me if I am wrong

You're not wrong - ISO has nothing to do with AF.


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petiot
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May 07, 2012 11:28 |  #24

Thanks!! thought I got too old too fast for a moment


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pwm2
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May 07, 2012 11:33 |  #25

timnosenzo wrote in post #14393253 (external link)
You're not wrong - ISO has nothing to do with AF.

Unless using contrast with live view.

But for the normal phase detection AF, the camera have a separate specification what light range the AF sensor system can support.


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petiot
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May 07, 2012 11:37 |  #26

thanks pwm2. Made a mistake myself, mixing phase (conventional AF) and contrast detection (AF using live view)


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timnosenzo
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May 07, 2012 11:50 |  #27

pwm2 wrote in post #14393330 (external link)
Unless using contrast with live view.

Curious, I just tried this myself using Live View and contrast AF in a somewhat dark environment. The camera acquired focus in the same amount of time whether it was set to ISO 100 (completely underexposed), or set to ISO 1600 (correct exposure). The camera may increase the ISO to acquire focus, but it didn't seem to matter what I had it set to.


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pwm2
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May 07, 2012 12:07 |  #28

The sensor normally spans so large dynamic range, that unless there are limitations added to the software, it should be able to pick up the focus even when the contrasty features image is a number of stops dark.

But maybe, just maybe, the camera will also make use of auto-ISO while waiting for the actual photo to be taken.

The significant difference between the two focus modes is that the contrast focus have much more information to work on - but will instead not know how much off the focus is. So it need to change the focus and recompute just to figure out if things seem to be better or worse. The phase sensor can compute (most of the time) how far focus is off and what direction and then tell the lens to do a big focus change at maximum speed.

So in the end, the contrast focus can be seen as more robust, while the phase focus works most of the time and then normally with a great speed advantage.


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DarthVader
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May 07, 2012 12:09 |  #29

Akita ?.

BHollis wrote in post #14393046 (external link)
I get all the same focus points/functions with my Sigma 85 as I do with my 35L. Getting excellent AF results with my Sigma 85.


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tagnal
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May 07, 2012 12:56 |  #30

Has anyone noticed autofocus not working sometimes when coming out of sleep mode? It's happened to me maybe the 3rd time ever this last weekend (so pretty rarely). I wasn't taking pictures for a bit and the camera self shut off (sleep), then when I pulled it up to take an image, it wouldn't focus and wouldn't shoot the image (since I have it set for focus priority). Pressing the shutter button down half way didn't work, so I tried the back button focus I have set and that didn't work either. I made sure the lens was still set to AF and it was. When I turned the camera switch off, then back on, AF was working normally.

Anyone else notice this?


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miscellaneous 5D MKIII questions
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