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Old February 18th, 2014, 10:35 AM   #1
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18-135 STM with C100

I'm seriously considering getting the 18-135 STM for outdoor work with the C100 where I know people / vehicles etc will be moving around constantly so AF would be useful.

Is the AF in such circumstance relatively reliable / fast etc or am I going to be disappointed?

I've seen lots of tests where people are moving the camera to static objects around a room, but none that are tracking moving vehicles, athletes etc.

Also, if I happen to zoom a little (slowly) during shooting (not something I do very often) does the AF maintain focus well enough since this doesn't appear to be a par focal lens.

How does the C100 deal with the variable aperture?

How happy are you with this lens wide open at wider angles, say 18-40mm ?
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Old February 18th, 2014, 12:22 PM   #2
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Re: 18-135 STM with C100

Dave I have the 18-135 STM lens, but I use it on a 70D. There is a thread where they are talking about using it with a C100 and the lens. I have never try zoom when shooting video yet.

Best general usage Lens for c100?
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Old February 18th, 2014, 12:36 PM   #3
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Re: 18-135 STM with C100

Thanks Michael, I've read that thread (lots of people recommending the 24-105 which I already have) but it doesn't really address my questions on AF tracking of moving objects, especially those coming towards you or away from you.
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Old February 19th, 2014, 12:51 PM   #4
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Re: 18-135 STM with C100

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Old February 19th, 2014, 01:10 PM   #5
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Re: 18-135 STM with C100

Thanks for that. My german (I assume it was german) is not that good so I didn't really get the audio part, but there was still a little more jumpiness than I'd hoped. Maybe this will be fixed by the new upgrade coming.

Hmmmm... I guess I should wait for that and see how my 24-105 works first.
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Old February 20th, 2014, 05:29 PM   #6
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Re: 18-135 STM with C100

I use that lens as my run and gun for the church. I like continuous AF. It is silent
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Old February 20th, 2014, 05:53 PM   #7
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Re: 18-135 STM with C100

Just got one. going to have a play with it over the weekend. First test not brilliant. A little too slow for my liking I think. But the DSLR Newshooter test of the new dual pixel auto focus looked a little too fast! Maybe I need something in between…
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Old February 22nd, 2014, 01:25 AM   #8
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Re: 18-135 STM with C100

I have a 18-135 STM lens but it will not do continuous auto focus although the one shot auto focus works fine. I have the latest firmware installed. Any ideas about what the problem may be?
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Old February 22nd, 2014, 03:50 AM   #9
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Re: 18-135 STM with C100

This Canon C100 autofocus upgrade film tutorial has been posted up on Vimeo.

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Old February 24th, 2014, 03:39 AM   #10
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Re: 18-135 STM with C100

Sorry to be a little late to the party.

I have this lens on the C100. I was initially excited by it in the camera store, but once purchased, I was hit by a huge dose of Buyer's Remorse and ended up hating it quite a bit due to its fly by wire characteristics:


This compares the 18-135 STM with the 'Classic' 24-105 L

BUT there are two things I've learned since then, which change the whole dynamic of the lens:

1) Switch on Zoom Iris Correct (Camera Setup --> Iris --> Zoom-Iris Correct)
2) Switch on Peripheral Lens Illumination (Periph. Illum. Corr. in the Camera Setup menu)

I found the Continual AF a bit underwhelming, but looking forward to the new Dual Pixel quasi-phase-detection update, which should really transform this lens.
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Old February 25th, 2014, 02:00 AM   #11
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Re: 18-135 STM with C100

Thanks for the info Matt. It's very informative. The problem that I'm having with the 18-135 lens is that it will not operate in AF mode. One shot works fine but not AF. I have the latest firmware that should support AF on the 18-135.
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Old February 25th, 2014, 02:13 AM   #12
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Re: 18-135 STM with C100

I found the Continuous AF mode, erm, 'ponderous' - taking a few (!) seconds to kick in. Even then, it might need a recomposition to initiate it. No, not good. I could see how it would appear to be not working. LOL
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Old February 25th, 2014, 07:31 AM   #13
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Re: 18-135 STM with C100

Thanks for the replies guys. I'm going to skip this one for now I think and just use the XF for the moving shots until the C100 gets the new AF upgrade and we see how it's performing.
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