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02-01-2021, 10:30 AM   #1
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Shooting Video

I've been playing around with video function on my K-70 recently and I find it pretty useless. Unless I'm doing something wrong... What I'm find is that video recording only occurs in live view (which makes sense as there mirror needs to be up) and autofocus is locked to AF-S...which is the problem. No continuous autofocus. I have to press the shutter release to get a refocus...so for moving objects (the point of video) image goes out of focus then back in...or even worse, hunts back and forth...wasting time and loosing the images. The only way I can see to use video is wide shots with wide angle lens at large aperture. Am I missing something here? I have a Sony NEX-C3 and focus is continuous and works as expected....and yes I use that if I actually want video. I realise the K-70 and Pentax in general isn't geared toward video...but if they're going to include it...at least make it functional.

02-01-2021, 10:36 AM   #2
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The K-70 does have continuous video AF (you need the 55-300mm PLM lens), but it's quite bad unfortunately. You can also press the AF button to activate on-demand AF during recording. I'd just continue sticking to the Sony for any action clips that require it.

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02-01-2021, 10:41 AM   #3
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Pentax K-70 Review - Movie Mode | PentaxForums.com Reviews

I don't own a K-70, but the in-depth review mentions that AF-C is only available for DC and PLM lenses, moreover it is not that good.
02-01-2021, 11:05 AM - 1 Like   #4
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QuoteOriginally posted by tonyzoc Quote
I've been playing around with video function on my K-70 recently and I find it pretty useless.
The general rule for shooting video with Pentax dSLRs is to use cinematic technique, meaning manual focus pulls during recording and no SR, just like the professionals do.


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02-01-2021, 11:09 AM   #5
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I was watching a Netflix production last night and was throughly unimpressed with the ability of the cameras used in the production to keep the actors in focus when moving towards and away from the camera. It would seem this is an issue with more than Pentax cameras and includes some professional gear.

Last edited by normhead; 02-01-2021 at 12:11 PM.
02-01-2021, 12:01 PM   #6
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QuoteOriginally posted by othar Quote
Pentax K-70 Review - Movie Mode | PentaxForums.com Reviews

I don't own a K-70, but the in-depth review mentions that AF-C is only available for DC and PLM lenses, moreover it is not that good.
That makes sense...the noise of the screw drive.

02-01-2021, 01:13 PM   #7
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QuoteOriginally posted by normhead Quote
I was watching a Netflix production last night and was throughly unimpressed with the ability of the cameras used in the production to keep the actors in focus when moving towards and away from the camera. It would seem this is an issue with more than Pentax cameras and includes some professional gear.
I had a similar experience watching a show on woodworking on PBS (public broadcasting) a few nights ago. The camera would focus hunt whenever there was movement in the frame and it was most distracting. Professional cinematographers (including those that do video capture) typically don't use AF during a take, even if the gear is capable. There is a reason why cine lenses have cogs for manual focus and aperture "pull" .




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02-01-2021, 04:19 PM - 1 Like   #8
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QuoteOriginally posted by tonyzoc Quote
I've been playing around with video function on my K-70 recently and I find it pretty useless. Unless I'm doing something wrong... What I'm find is that video recording only occurs in live view (which makes sense as there mirror needs to be up) and autofocus is locked to AF-S...which is the problem. No continuous autofocus. I have to press the shutter release to get a refocus...so for moving objects (the point of video) image goes out of focus then back in...or even worse, hunts back and forth...wasting time and loosing the images. The only way I can see to use video is wide shots with wide angle lens at large aperture. Am I missing something here? I have a Sony NEX-C3 and focus is continuous and works as expected....and yes I use that if I actually want video. I realise the K-70 and Pentax in general isn't geared toward video...but if they're going to include it...at least make it functional.
Well, Tony, DSLRs are aimed at people who know what they're doing, and in cinematography, the norms are:

*Manual Focus

*Manual Exposure

You should Google 'cine lens' and you'll see what I mean.

The sort of off the cuff video clips are most easily done on a phone. With such a small sensor it's easy to get 4k and very high frame rates, too, for slo-mo footage.
02-03-2021, 12:23 AM - 1 Like   #9
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QuoteOriginally posted by normhead Quote
I was watching a Netflix production last night and was throughly unimpressed with the ability of the cameras used in the production to keep the actors in focus when moving towards and away from the camera. It would seem this is an issue with more than Pentax cameras and includes some professional gear.
The professionals usually have a human being doing the focus.



Focus puller - Wikipedia

Last edited by Wasp; 02-03-2021 at 12:34 AM.
02-03-2021, 02:26 AM   #10
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How does the focus puller know where, when and by how much to turn that knob? Remember that the focus puller does not get to look at the viewfinder, that's for the camera operator. Modern digital jobs could have an external monitor to help but historically this was not the case. It gets worked out and marked before the shot. It's quite an art.



So if you focus manually while shooting video, it means that you are a pro.
02-03-2021, 03:31 PM - 1 Like   #11
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QuoteOriginally posted by Wasp Quote
How does the focus puller know where, when and by how much to turn that knob? Remember that the focus puller does not get to look at the viewfinder, that's for the camera operator. Modern digital jobs could have an external monitor to help but historically this was not the case. It gets worked out and marked before the shot. It's quite an art.
Sure, and because everything about a shot is planned, tape measures have been used, marks left on the ground for actors to casually walk into or turn their head to ... etc.

A problem for amateur film makers is that they already struggle to take a good still photo - if you get five things right, the sixth thing you get wrong means it's a throwaway, but for video, it's like fifteen things to get right because a scene is being covered from start to finish.

Lousy audio or colour imbalance for instance detracts from the whole video clip. People screw up their noses when seeing it on Youtube, and it will be unsaleable to content providers.
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