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Footage 'twitch' Canon 70-200 stabilisation issue?

Ed Andrews
 

I shot some concert footage at a show last night using a FS7, metabones ef-e Mk4 and a Canon 70-200 mk2. It was on the shoulder as we were not permitted tripods in the pit!

On reviewing the rushes this morning, I noticed a strange glitch that regularly occurred in the footage - usually at the 200mm end - with the picture jumping/twitching in the space of a few frames. 

You can view an example here:

password: glitch

Has anyone come across this before? Could it be an issue with the lens' IS system? 

Any advice / feedback very much appreciated.

Cheers.

--
Ed Andrews
Director / DoP
London


0044 (0) 7762 015 634
@ed_andrews555


Miguel Bunster
 

did you have the IS on?

Miguel Bunster
--
Miguel Bunster
www.miguelbunster.com
LA - (323) 963-4397
Chile - 7.9652894

Matthew Dorris
 

Looks like it might be the stabilizer—usually can happen when on sticks though. I normally don’t see this when handheld though so surprised that it happened on your shoulder.

Matthew Dorris
DIT/DP Boston MA

On Sun, Sep 30, 2018 at 8:43 AM Ed Andrews <edandrews555@...> wrote:
I shot some concert footage at a show last night using a FS7, metabones ef-e Mk4 and a Canon 70-200 mk2. It was on the shoulder as we were not permitted tripods in the pit!

On reviewing the rushes this morning, I noticed a strange glitch that regularly occurred in the footage - usually at the 200mm end - with the picture jumping/twitching in the space of a few frames. 

You can view an example here:

password: glitch

Has anyone come across this before? Could it be an issue with the lens' IS system? 

Any advice / feedback very much appreciated.

Cheers.

--
Ed Andrews
Director / DoP
London


0044 (0) 7762 015 634
@ed_andrews555


--
--
Matthew Dorris
651-491-6915

Petros Nousias
 

Hi Ed,

This is something I've experienced a few times in the past, always with zooms in the far end, in rather shaky conditions.
In my opinion it happens when the stabilization element has reached an end (say, too much stabilizing towards the left) and needs to re-center. I always wondered why can't this be done in a smoother way but forgot to look it up.

Petros Nousias
Cinematographer
Athens/Amsterdam

Ed Andrews
 

Yeah, it was on 

On Sun, 30 Sep 2018 at 14:26, Miguel Bunster <miguel.bunster@...> wrote:
did you have the IS on?

Miguel Bunster
--
Miguel Bunster
www.miguelbunster.com
LA - (323) 963-4397
Chile - 7.9652894

--
Ed Andrews
Director / DoP
0044 (0) 7762 015 634
@ed_andrews555

Michael O'Halloran
 

Hi ed, there are two types of i.s. with that lens, if you have it on mode two this should work best for moving shots.

Do you remember what mode it was on?

At the 200mm end it can get twitchy if the movement is really shaky, also I haven’t used it myself with metabones which might affect things

Cheers

Michael O’Halloran (London) 

On 30 Sep 2018, at 12:51, Ed Andrews <edandrews555@...> wrote:

glitch

Miguel Bunster
 

yea is the IS in my opinion. Had the same issue on diverse setups. I actually use a 70-200 non IS but because at the time was cheaper and lighter. 

its a still lens, a fantastic one but not made for video so this sort of things happen some times. 

best

miguel bunstee
--
Miguel Bunster
www.miguelbunster.com
LA - (323) 963-4397
Chile - 7.9652894

John Rohrbach
 

Agree with Petros - I have had this with the 70-200 when my body movement overloads the ability of the IS to compensate... rather than staying in the position I pushed it past, it seems like sometimes it resets itself, and the effect is just like what you describe.


On Sun, Sep 30, 2018 at 11:11 AM Miguel Bunster <miguel.bunster@...> wrote:
yea is the IS in my opinion. Had the same issue on diverse setups. I actually use a 70-200 non IS but because at the time was cheaper and lighter. 

its a still lens, a fantastic one but not made for video so this sort of things happen some times. 

best

miguel bunstee
--
Miguel Bunster
www.miguelbunster.com
LA - (323) 963-4397
Chile - 7.9652894

Ed Andrews
 

It was on mode 1. Will try 2 next time and get a heavier camera than the fs7! Or at least put a big v-lock on the back

Thanks all for your thoughts and advice.

On Sun, 30 Sep 2018 at 15:50, Michael O'Halloran <michael@...> wrote:
Hi ed, there are two types of i.s. with that lens, if you have it on mode two this should work best for moving shots.

Do you remember what mode it was on?

At the 200mm end it can get twitchy if the movement is really shaky, also I haven’t used it myself with metabones which might affect things

Cheers

Michael O’Halloran (London) 

On 30 Sep 2018, at 12:51, Ed Andrews <edandrews555@...> wrote:

glitch

--
Ed Andrews
Director / DoP
0044 (0) 7762 015 634
@ed_andrews555

Mako Koiwai
 

Weight has nothing to do with this issue. It’s an optical IS system. Just turn off the IS.

OK, I guess you feel that more mass might keep movement from being transmitted to the lens, but you can get that glitch even with a locked off camera. The newer lenses should “recognize” when they are locked off and deactivate the IS. But when the camera is being operated the IS will activate.

Makofoto, Detroit, MI

Phil Curry
 

I have seen such a twitch when there is a bad electrical connection to
the camera.  This can happen when the internal lens cables are disturbed
in different zoom positions.  Send the lens to a tech to be checked.

Phil Curry
DP
Austin

ScottB
 

If you can duplicate this issue using a different E to EF adapter, I would have the lens checked.

I shoot handheld with an FS7/Metabones/70-200 mk2 combination regularly and rely on the IS. I have not seen what you show.

Scott B
DP/Director

Steve Oakley
 

yes thats an IS thing where it hits the end of its movement and then snaps to center. Its not just long lenses, even wide lenses with IS will do it.

I do dearly wish canon, sigma would have a soft center return feature designed for video. they are well aware of the problem but I guess they don’t get enough people complaining to fix it which would be a trivial code change in lens firmware. well, at least sigma lenses you can update the firmware on your own, canon would likely be a “repair”. :(

Steve Oakley
DP / Editor / Colorist / VFX Artist
Madison & Milwaukee WI
920 544 2230

On Sep 30, 2018, at 1:14 PM, Mako Koiwai <mako1foto@...> wrote:

Weight has nothing to do with this issue. It’s an optical IS system. Just turn off the IS.

OK, I guess you feel that more mass might keep movement from being transmitted to the lens, but you can get that glitch even with a locked off camera. The newer lenses should “recognize” when they are locked off and deactivate the IS. But when the camera is being operated the IS will activate.

Makofoto, Detroit, MI