Hello,
I have had a lot of experience shooting video on Pentax bodies in the exact use case you are questioning - sit down interview style. I did it as a way to save money. Since I already had a Pentax body, I did not want to buy another camera just for video. In this way the cameras do as they advertise.
I am not actually very good at video so don't trust me that way but I can show you some practical results as someone who shot video on Pentax for over a year consistently.
The shots of myself in this video are recorded on the K-1 with an external mic feeding into the camera:
Different mic setup but still K-1
Pentax K-3 III recording 4k with external mic myself on camera:
Pentax K-3 III recording 4k for broll of camera shots
So can the Pentax cameras record usable video? I think so, especially for sit down shots and product shots and you can control the lighting as someone else said. I've struggled with lighting a lot but it makes a world of a difference.
That said, I would not buy a Pentax camera knowing I was going to shoot a lot of video. But if you want only one camera, and you want a Pentax for stills (I love Pentax so I get that
), then you can make it work.
I have finally upgraded to a dedicated video camera setup, a $300 used Panasonic g85, and it's much better for a few reasons:
- Video quality is better at same resolutions
- easier to get colors looking right, no shadow mush, can color grade in post easier
- More video features, more frame rates, on screen histogram etc
- Video stabilization is much more natural looking
- Video autofocus is usable! (not so with the Pentax's)
Here's a video on the Panasonic g85 setup:
Even a modern iPhone/Samsung will produce crisper video from my experience and should be considered if you already own one, but for sit down shots I still preferred the Pentax's large sensor and fast lenses I could put on it for the natural bokeh look. That depth of field in the end made the image look more professional than cleaner video without a blurred background. The smartphone's have a way to go in that regard.
Sorry that was long. Hopefully it was helpful. I think you already got some very good pointers from others here but wanted to chime in anyway.
Thanks,
-james