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06-17-2012, 08:29 AM   #1
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Video with K5

Hi,
I am just trying to use the video mode of the K5. I it normal that the AF does not work ? I mean not during the recording ? It also seems to me that you cannot really use the zoom and the focus is not correct anymore if you change the focal.
Is this correct ?
Thanks.

06-17-2012, 08:35 AM   #2
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Yes, K-5 does not support AF during video mode.

And please someone correct me if I'm wrong, but if the zoom is not an internally-focusing one (such as DA* 50-135), the focus does change and you have to adjust it manually when you zoom.
06-17-2012, 08:47 AM   #3
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Don't know if the zooms needs to be internal but often the more expensive zoom do indeed hold their focus well enough.

Over the autofocus, it's not really a miss just look at this.
Pentax uses the same system as cannon for autofocus during liveview (so potential video) sony uses a different autofocus system, the same we use when we use the viewfinder.
07-07-2012, 09:37 PM   #4
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I think I have memory problem with k-5 video. It has Lexar 16gb, class 10 SDHC. It shows right number of remaining still JPG pictures (about 1033) for formatted card, but In "video" mode it shows 21'25" of remaining record time. Just after starting of recording, it shows 5'25" of remaining time and stops recording after that time. Can sanybody comment that?

07-08-2012, 08:01 AM   #5
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QuoteOriginally posted by bvg Quote
I think I have memory problem with k-5 video. It has Lexar 16gb, class 10 SDHC. It shows right number of remaining still JPG pictures (about 1033) for formatted card, but In "video" mode it shows 21'25" of remaining record time. Just after starting of recording, it shows 5'25" of remaining time and stops recording after that time. Can sanybody comment that?
It's the write speed of the camera and card most likely.
The camera use his buffer and write off what it can but when the buffer is full it needs to stop.
5 minutes are fine though, scenes lasting longer then that should be broken up anyway.
If you need to record that long use lower quality setting 720p still looks great.
07-09-2012, 03:50 AM   #6
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Hm-hm. It shows similar numbers for HD760 : 34'29"/8'41". Even my p&p camera promise 50' of HD record.
07-09-2012, 07:47 AM   #7
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But try it out, as you have already notice the number changes.

Your p&p shoots in very different format and quality, just look at the filesize of the K5 for 1 minute off film.
07-11-2012, 02:57 PM   #8
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Focus will only hold while zooming with a Parfocal lens, which elimnates most modern AF zooms.

Parfocal lens - Wikipedia, the free encyclopedia

07-11-2012, 03:44 PM   #9
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QuoteOriginally posted by bvg Quote
I think I have memory problem with k-5 video. It has Lexar 16gb, class 10 SDHC. It shows right number of remaining still JPG pictures (about 1033) for formatted card, but In "video" mode it shows 21'25" of remaining record time. Just after starting of recording, it shows 5'25" of remaining time and stops recording after that time. Can sanybody comment that?
Yes. Individual clips are limited to 5'25" due to a 4GB file limit, ie, any file can't be larger than 4GB on an SDHC card and what that is telling you is with your current video settings 4GB equates to 5'25" of video. However the total card has a capacity of 21'25" worth of clips.
07-11-2012, 05:16 PM   #10
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Quick note - this limit even exists when using SDXC cards which don't have the innate 4gb limit, so that isn't a solution either.

QuoteOriginally posted by twitch Quote
Yes. Individual clips are limited to 5'25" due to a 4GB file limit, ie, any file can't be larger than 4GB on an SDHC card and what that is telling you is with your current video settings 4GB equates to 5'25" of video. However the total card has a capacity of 21'25" worth of clips.

Last edited by dcshooter; 07-13-2012 at 03:30 PM. Reason: clarity
07-13-2012, 09:37 AM   #11
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Yes, the p&p took 1.34 gb for 20' record and k-5 took 3.14 (why not 4?)gb for 8'41" record (all for720p30).
07-14-2012, 01:27 AM   #12
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QuoteOriginally posted by Anvh Quote
Don't know if the zooms needs to be internal but often the more expensive zoom do indeed hold their focus well enough.

Over the autofocus, it's not really a miss just look at this.
Pentax uses the same system as cannon for autofocus during liveview (so potential video) sony uses a different autofocus system, the same we use when we use the viewfinder.
302 Found
And the a55 manages to do that by taking one third of the light away from the sensor permanently to feed its af sensors, better video, worse photos, for me at least. Pays your money, takes your choice - I believe sensors with phase af on the main sensor area are in development and that will be a game changer for video.
07-26-2012, 09:13 AM   #13
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I am having problems down loading the video to the PC,can anyone help.
07-26-2012, 02:08 PM   #14
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QuoteOriginally posted by dcshooter Quote
Quick note - this limit even exists when using SDXC cards which don't have the innate 4gb limit, so that isn't a solution either.
Actually it does that because the camera don't work with exFAT (FAT64) but still with FAT32, that's where the 4GB limit comes from not that card itself. If you want you can format a 8GB SDHC card in exFAT and put on files large then 4GB on it, try it if you dont believe me
And the time limit is there because the import VAT is higher for video equipment than for photography equipment, and it's a video camera when it can record for 30+ minute of film.
07-26-2012, 02:17 PM   #15
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QuoteOriginally posted by bvg Quote
Yes, the p&p took 1.34 gb for 20' record and k-5 took 3.14 (why not 4?)gb for 8'41" record (all for720p30).
Out of RAM is the most likely answer.
Let me explain the process you might understand why then.

this the process tree as far as i know how it works.

sensor > RAM > processing > RAM > write to SD card

So your sensor writes to the RAM because the sensor needs to "dump" the frame before it records the next frame.
The processor then takes the frame from the RAM and process it but it has little to non memory of his own so it needs to also dump that to the RAM so it can keep on processing.
Another part of the processor takes the process information from the RAM and put it on the SD card.

So long as the sensor has room to "dump" the frames (his information) so that it can keep on recording new frames it will go on.
A slow down in the processor and/or writing to the SD card will fill the RAM memory leaving less and less room for the sensor to "dump" his information and so it will stop when it can't.

Last edited by Anvh; 07-26-2012 at 02:27 PM.
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