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Author Topic: at what shutter speed you turn IS off?  (Read 9003 times)

FTb-n

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Re: at what shutter speed you turn IS off?
« Reply #45 on: February 16, 2013, 01:56:57 AM »
As stated earlier in this thread (see page 2) IS does not slow the AF system and will likely help it.  Look for the Chuck Westfall quote (HT. privatebydesign).  This makes sense, particularly for moving objects.  The steadier the image, the easier to focus.

Mine is on at all times for all IS lenses in my sig line below.  It is curious though that experiences with IS, particularly with battery drain, must be dependant upon the lens.  I think my biggest power hungry lens would be my 70-200 f2.8L Mk2 and I don't think there's a noticeable drain using IS on this lens.  But, maybe there is with the really big boys.

[Edit: Just realized that I only have two IS lenses in my sig line.  Others include the 18-135 (non-STM), 17-85, 70-300 (non-L).]
« Last Edit: February 16, 2013, 02:59:13 AM by FTb-n »
5D3, 7D | 70-200 f2.8L IS II, 24-105 f4L IS, 17-55 f2.8 IS, 40 f2.8, 35 f2 IS...  |  PowerShot S100

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Re: at what shutter speed you turn IS off?
« Reply #45 on: February 16, 2013, 01:56:57 AM »

florianbieler.de

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Re: at what shutter speed you turn IS off?
« Reply #46 on: February 16, 2013, 02:29:20 AM »
I actually never cared too much about IS, really only turning it off when on a tripod.
EOS 5D Mark III · Canon 17-40 4.0L · Sigma 35 1.4 · Sigma 85 1.4 · Canon 70-200 4.0L IS · Tamron 150-600 5-6.3 VC
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mrsfotografie

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Re: at what shutter speed you turn IS off?
« Reply #47 on: February 16, 2013, 05:24:19 AM »
I leave it on or select mode 2 for motorsports. Rather annoyingly Ive accidentally switched IS off several times without knowing it while handling my 70-200 IS. This happened quite often on the MkI version of this lens and I need to monitor this behavior on the MkII. If it occurs again I will probably tape a small piece of toothpick in the gap next to the switch to keep it on.
5D3, 5D2, Sony NEX-6 | SY14mm f/2.8, Ʃ20mm f/1.8, 35mm f/2, Ʃ35mm f/1.4A, 50mm f/1.8 I, Ʃ50mm f/1.4 EX, 100mm f/2.8L Macro, 17-40L, 24-105L, 70-200 f/2.8L IS II, 1.4x II, 70-300L, 100-400L | E-mount: Ʃ19mm f/2.8 EX DN, Ʃ30mm f/2.8 EX DN, 16-50 OSS, 55-210 OSS | 2x FT-QL, AE-1P, FD(n) & FL primes.

Canon-F1

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Re: at what shutter speed you turn IS off?
« Reply #48 on: February 16, 2013, 06:46:17 PM »
Quote
You don't need to shoot a single image ever to have a very in depth knowledge of how the technology actually works. Personally, with regards a technical question relating to Canon gear, I would go with the word of the real Chuck over Jay Paredes.


LOL

chuck westfall will also tell you the 6D has a great autofocus system.   ::)
6D, 5D MK2, 7D, 550D... a lot of Glass.

Canon-F1

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Re: at what shutter speed you turn IS off?
« Reply #49 on: February 16, 2013, 06:48:45 PM »
He might be in PR, but he doesn't give a damn when you use IS on a lens you already own, if his comments were a stinging sales brochure for lens based IS over body based IS then you might have a point, but nothing he says in this instance has any effect on sales, indeed he wants people to be very happy with the lenses they own, get the best out of them, and tell everybody else the best way to get keepers. Happy knowledgeable customers are the most effective sales tool.

a good PR man is always on the job.
IS lenses cost more so he has to promote them in every possible way, always.
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Canon-F1

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Re: at what shutter speed you turn IS off?
« Reply #50 on: February 16, 2013, 06:50:58 PM »
Common sense tells us it does, but not necessarily in every conceivable situation.

does it?

IS needs processing power.
my common sense is not sure what is correct.... could be either.
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TrumpetPower!

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Re: at what shutter speed you turn IS off?
« Reply #51 on: February 16, 2013, 07:22:47 PM »
IS needs processing power.

That processing is done entirely by the lens, not by the camera. That's why IS works the same on any EF mount body, from film through the 1DX. It's also why upgrading bodies doesn't enable new IS modes and better IS performance on old lenses.

So, yeah. I would entirely expect IS to improve autofocus performance. And I'd be astounded if IS degraded AF performance, though I could easily imagine situations where whatever improvement it might make would be negligible.

Cheers,

b&

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Re: at what shutter speed you turn IS off?
« Reply #51 on: February 16, 2013, 07:22:47 PM »

pwp

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Re: at what shutter speed you turn IS off?
« Reply #52 on: February 16, 2013, 07:34:20 PM »
Quote
Chuck Westfall
well... how many photos does the guy shoot a year?
i have read so much crap from him (and i mean the real chuck not the fake one)  :)

Not only is Chuck Westfall a very good friend to the Canon community globally, he does stay ahead of the game in terms of what works and what doesn't. And then he has a great ability and willingness to communicate. And it goes back a long way. He was an awesome contributor to the now gone and much lamented Rob Galbraith forums. His prompt technical posts played a significant role in helping a lot of photographers around the planet make the transition from film to digital. And he hasn't stopped giving.

Quite likely he doesn't shoot as much per year as you do, but to flame this guy is a travesty.

-PW

Botts

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Re: at what shutter speed you turn IS off?
« Reply #53 on: February 17, 2013, 09:22:24 AM »
Quote
You don't need to shoot a single image ever to have a very in depth knowledge of how the technology actually works. Personally, with regards a technical question relating to Canon gear, I would go with the word of the real Chuck over Jay Paredes.


LOL

chuck westfall will also tell you the 6D has a great autofocus system.   ::)

It depends on use case.  If you're not shooting action, the 6D does have great autofocus, it's quite accurate, and works in extremely low light.  If you are shooting sports though, you wouldn't call it great.  I'd take slightly less accurate AF for speed every time for sports.
I would say though, for me, I'll use IS all the time, unless I'm on a tripod.  I rarely shoot at 1/1000s as I'm usually more concerned about deep DOF.
That said, I'm shooting animals on Tuesday, I'll have to test my AF speed with the 70-200 f/2.8 II and the 70-300L with IS on and IS off, to see if it's a notable difference.
6D, Sigma 35/1.4, 40STM, 50/1.4, 70-200/4 IS, 430ex II
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RMC33

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Re: at what shutter speed you turn IS off?
« Reply #54 on: February 17, 2013, 11:24:14 AM »
He might be in PR, but he doesn't give a damn when you use IS on a lens you already own, if his comments were a stinging sales brochure for lens based IS over body based IS then you might have a point, but nothing he says in this instance has any effect on sales, indeed he wants people to be very happy with the lenses they own, get the best out of them, and tell everybody else the best way to get keepers. Happy knowledgeable customers are the most effective sales tool.

a good PR man is always on the job.
IS lenses cost more so he has to promote them in every possible way, always.

He was talking about a lens the owner already had, there was no potential sale involved. Indeed few lenses in the Canon range have IS or no IS options, obviously the 70-200 f2.8 and f4 (but wasn't the non IS 2.8 dropped?) and when there is that option IS is not the only difference in the lenses, a laå 100mm macro with weather sealing and internal focusing.

The Non IS is a 1995 lens and has been discontinued recently. I was told that by CPS while on the phone the other day. I still see a lot of them on my local CL though.

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Re: at what shutter speed you turn IS off?
« Reply #54 on: February 17, 2013, 11:24:14 AM »