It doesn't have any use except that on some systems leaving the IS on
while the camera is on a tripod causes the IS to become confused and
*it* causes motion blur where there was none. The best solution I
suppose is always turn it off when it's not needed. But the question
really had to do with what happens if you forget.
Chuck Norcutt
On 11/8/2012 10:41 PM, Bill Pearce wrote:
> OK, someone needs to explain to me. If the tripod is doing its job, what
> earthly use would be IS? We have already by now got most of the internet
> idiots to understand the difference between camera and subject motion.
>
> Bill Pearce
> -----Original Message-----
> From: Chuck Norcutt
> Sent: Thursday, November 08, 2012 6:57 PM
> To: Olympus Camera Discussion
> Subject: Re: [OM] E-M5 question
>
> That's interesting but I don't think Canon got your memo. The
> instructions for the Canon 70-200/2.8 IS lens say to turn off the IS
> function when shooting in Bulb mode and, additionally, it might be
> helpful to turn it off on a tripod under certain (unspecified)
> conditions. Since my 5D will do a shutter speed of 30 seconds without
> using bulb mode I conclude that all is well until 30 seconds. But on a
> practical note 1/2 second is probably more reasonable since subject
> motion will likely be a more serious problem pretty quickly after 1/2
> second.
>
> Anyhow, the reason I asked the question is that it has always been my
> understanding that early Canon IS lenses wanted the IS turned off when
> on a tripod but that that restriction had been lifted on later lenses.
> The instructions for the 70-200/2.8 IS seem to bear that out. I was
> expecting to hear that Olympus had done the same.
>
> So I finally decided to go to the horses mouth and looked in the E-M5
> user's manual. Its only comment on the subject is to turn the IS off if
> the camera is on a tripod.
>
> Chuck Norcutt
>
>
> On 11/8/2012 6:36 PM, Ken Norton wrote:
>>> Does the IS on the E-M5 need to be disabled when on a tripod or
>>> partially disabled when using a monopod?
>>
>> Chuck, it's the same deal with all forms of electro-mechanical-optical
>> image-stabilization. It addresses movement up to about a half second.
>> Beyond that and you'll get both random movements and re-centering. So,
>> as long as your shutter speed is faster than 1/2 second, having IS
>> turned on will be a benefit. Beyond 1/2 second and you start getting
>> blurring caused by the IS system.
>>
>> AG
>>
>>
--
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