HPX250: Darn, messed up, can anyone help?

Neil Richards

Active member
Hi Folks,

I was invited in at the last minute to film a world record attempt held on our local beach last weekend (greatest number of sandcastles built in 1 hour!) after the original video company pulled out.

I grabbed my two HPX250's and a couple of smaller backup cameras and set them up on tripods to film the entire thing. For the purposes of the world record verification they needed a continuous, unedited video of the entire attempt including the adjudication process afterwards, potentially 2.5-3 hours. I took no chances: big batteries, big cards and three cameras. I'm pleased to say that all went without a hitch.

Since I was there I put a 250 on a small shoulder rig and wandered off to make a run-and-gun event video. I shot it AVC Intra 50 as I was told there was potential press interest in the event and this is generally considered acceptable for news footage. Most of it was crowd scenes, shots of sandcastles, interviews with organisers etc. In general this all came out fine too.

On a couple of occasions, though, I needed to use the zoom, in particular to get a close up of the timing clock which was high up a way away. Now, this is a big zoom on this camera and with no tripod left I relied on being as steady as possible (!) and trusting that any small residual movement I could probably correct in post.

However, when I tried to do this in FCP I found that although the movement was stabilised there was a sort of slowly pulsing blurred/double image. I have been completely unable to remove this and have never seen it before. I thought the shot was manual focus (I use the red focus assist a lot) but I'm now wondering if I made a really dumb mistake and had the autofocus on and this is the AF hunting slowly in and out at the end of the zoom range.

Any opinions? Not much I can do about it this time but I'd like to know so I can avoid it next time.

Thanks

Neil
 
It's definitely autofocus. I've had it happen on the 170 as well as the 250. What I'm not sure about is if it also did it with the focus assist on. That is different than the focus in red. When you manually focus there is a menu setting that you can turn on and off to have the autofocus kick in to fine tune your focus even when you're in manual.
I had to ask Jan about this a while back on my 170 because I would manually focus on a red berry at the minimum focus distance and I could see the berry go out of focus as soon as I would stop focusing on my own. Turns out I had that manual focus assist turned on and that's what was doing it. So that's one of the first things I turn off now.
 
Yes, it could very well have been MF ASSIST, good call Kevin.

For precise manual focusing, you want MF ASSIST turned off. For quick ENG-style focusing, you can turn it on, it makes the focus ring travel a lot shorter distance, and it engages autofocus at the end of the focus move to touch up the final focus, although it's in a very limited range.
 
Kevin, Barry, thanks a lot. I thought I was fully manual at that point but may well not have been.

I'll check this again soon when I'm not under any pressure ;) and confirm.

Cheers

Neil
 
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