AC130: Is the Ac-130 really that good for run 'n gun???

Hi Jeff

If you are shooting mainly on wide (like I do most of the time at wedding receptions) the autofocus will behave itself very well actually!! It seems to only act up when you are zoomed up a bit and static on a tripod. Use it handheld and moving around the event it's really good but it only mis-behaves on static shots...At weddings I use the one 130 on a tripod for speeches at a lectern and then shoot cutaways on the second camera...the AF will lock onto the person at the lectern without too much trouble and hold focus in auto fairly well but if they happen to move out of shot the whole image goes fuzzy, despite the fact that the lectern is, say, about 3' in front of a wall with some flowers (so there is plenty for the cam to refocus on) BUT it doesn't!!! It goes way, way out of focus really badly and as soon as the speaker moves back into shot the focus is still way off to the point where the image is a total blur...Now, I would have expected at worst, the AF to refocus on say, the flowers behind the lectern or the lectern itself and then refocus again when the speaker moved back into shot but it doesn't do that at all!! The depth of field at say 15' away and at F3.5 (I have good lighting) is more than 3' at a focal length of say 30mm (which is more than I zoom anyway) (At 30mm zoom you are in focus from 12' to 18' ) so for me the image shouldn't change. As proof if I set the lens in manual to 15' the image is clean regardless so I have absolutely no idea what the AF does?? Maybe it gives up and sets the focus to 12" ??? It certainly looks like it!!

Of course the answer is simple ..don't use AF if you are on a tripod and zoomed in even 2 x or 3X ....using the push for auto and manual it works like a dream!!!

I must admit I do find the ND's a pain but only in bright outdoors when you have to constantly change it when you are moving from shade to sun...however I'm getting used to it now!!!

Chris
 
using the push for auto and manual it works like a dream!!!

In case of the example you gave where the camera was zoomed in at the priest with having enough "solid" material to refocus on but lost focus anyway, how does the one push autofocus work then? I just wonder that if the camera is not able to find focus on it's own in automode how a one push autofocus, in the same situation, would be any reliable then?
 
Hey Noa

Not at all..the camera finds focus in auto with no issues at all...now, IF the priest walks out of the frame, the camera loses focus completely and the screen becomes a blurred mush...if the priest walks back into the shot it still stays a mush!!! Right?? now put the camera into manual and push the "push for auto button" ..the camera finds focus quite fast ..as soon as auto has determined focus, release the button and the same distance should be transferred to manual and it, of course, stays there and it's perfect for as long as you like..people can walk in and out of the shot and it will simply keep focus cos it's in manual!! It only seems to happen with zoomed in shots and the camera left in auto...it simply goes haywire BUT if you switch to Manual with the screen all blurred and use the "push auto" the way I detailed above, it grabs focus for you as long as you switch manual again.
I still believe that the autofocus design has a serious issue but Panasonic say no...I've shot on Panny since 1989! and these are the first cams with an AF issue this bad .... All my other Pannys have had 10x or 12x zooms ..never 22X so it might be the lens..I'm not sure..one thing I do know is that regardless of the subject and lighting..the auto works perfectly in wide...it only goes crazy when you are zoomed in!!! I've shot 10 weddings on the cams now and never an AF issue in wide but zoom in and you are asking for trouble so it's definately worth going manual in all cases where you zoom and have a static cam on the tripod.

Chris
 
Thx chris for the response, it's a bit strange though that the one push focus is better then the autofocus when both are trying to get that same focus right. It must be that the one push function uses another way to get focus right. Maybe lock the one push button with tape so it's allways in that mode, gone are the autofocus issues ;)
 
Hi Noa

I don't think you can keep the button down...that will confuse the camera!! In fact the 130 really and truely needs to be used in manual totally and that's the end of the story..At a wedding on Saturday, despite shooting for around 10 minutes in the outdoors with the cam on my shoulder the ATW suddenly decided for no reason to make the image blue..it lost white balance totally and the light never changed..it was an overcast day with really nice even light!! It's my season end now so I am going to revert to my two HMC80's for weddings and run 'n gun and then use the Lumix GH1 for low light receptions ...I'll reserve the 130's purely for commercial and theatre shoots where I can use the cameras in manual. That way I can control the exposure, focus and WB myself. The HMC80's despite the smaller chips are absolutely awesome for run 'n gun ...I have used them for 2 years now and you can rush around at weddings in full auto and end up with really nice footage that's in focus and the WB is deadly accurate!! The iris control is also seamless which is really useful at outdoor weddings (On Saturday I actually had to switch in an ND on the 130 as the lighting conditions changed which ends up as a nasty flash on the footage (but easy to hide)
I guess it's simply using the right tool for the right job and I now have a set of cameras for either one type of shoot or the other and I can select which is best suited!

Chris
 
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