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01-07-2010, 06:13 PM   #1
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K7 Buffer Issue?

Hello, I just upgraded to a K7 (from my k10) and I'm having a weird issue with continuous drive shooting. The buffer seems to fill up after 5 shots and shooting speed slows down drastically after this. I have upgraded the firmware to 1.02 with no change.

I'm testing this currently with JPG and a SanDisk Extreme III card. The same thing happens with my old/cheap SD card. I was under the impression that I should be able to shoot 23 JPG frames regardless of card speed.

I have tried reducing to 2 mp and disabling both NR, but neither impact the issue. Changing to RAW allows me to capture 4 frames before the buffer seems to fill.

I'm hoping I'm just missing something simple. Just had to return a 50-135 yesterday due to autofocus not working. Hoping not to have 2 defective products in a row. Any help is appreciated.

Thanks.
--Sam

01-07-2010, 11:22 PM   #2
hcc
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Sam,
I do a lot of continuous shooting and I have a K-7. I found that the best settings for continuous shooting (Hi) are:

- remove all post-processing (especially lens correction) in your camera settings; extremely important because the PP slows down the writing speed;

- use a good SD card; for example a Class 10 30 Mb/s; in continuous shooting [Hi], you will need have 5.2 files per seconds to transfer to your card;

- select a file format (and size) that allows you some continuous shooting without saturating the buffer; for example, with a class 10 SD car, ensure that the file size is less than 5 Mb; I use myself JPEG 6Mp [***] with my SD class 10 card;

- do not use RAW in contunuous shooting: you will fill up the buffer after a few shots.

Using continuous shooting [Hi] with JPEG 6 Mp [***], I can shot more than 20 s at 5 fps: I have not tried for longer yet.

I hope that the advice will help.

Last edited by hcc; 01-07-2010 at 11:22 PM. Reason: typos
01-07-2010, 11:42 PM   #3
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Yeap, I am almost almost certain that you have distortion correction and chromatic abberhation correction enabled. Your camera is taking some time to process the distortion and CA out of the image. With these enabled, it will take a lot longer for your camera to store them in your memory card.
01-08-2010, 12:53 AM   #4
hcc
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QuoteOriginally posted by hcc Quote
Sam,
I do a lot of continuous shooting and I have a K-7. I found that the best settings for continuous shooting (Hi) are:

- remove all post-processing (especially lens correction) in your camera settings; extremely important because the PP slows down the writing speed;

- use a good SD card; for example a Class 10 30 Mb/s; in continuous shooting [Hi], you will need have 5.2 files per seconds to transfer to your card;

- select a file format (and size) that allows you some continuous shooting without saturating the buffer; for example, with a class 10 SD car, ensure that the file size is less than 5 Mb; I use myself JPEG 6Mp [***] with my SD class 10 card;

- do not use RAW in contunuous shooting: you will fill up the buffer after a few shots.

Using continuous shooting [Hi] with JPEG 6 Mp [***], I can shot more than 20 s at 5 fps: I have not tried for longer yet.

I hope that the advice will help.

I forgot to add that you must set the camera in AF.S or Manual focus during continuous shooting [Hi]. Do not use AF.C.

01-08-2010, 07:19 AM   #5
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Thanks for the replies. The issue was in fact I had lens distortion enabled. Can't keep track of all these new features

My replacement 50-135 is out for delivery, so hopefully I'll be a happy Pentax user again.
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