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03-31-2010, 04:11 PM   #1
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K-x Continuous Shooting Raw +

Hello,

Does anyone know what the continuous shooting speed would be for a K-x when shooting Raw+Jpg? Would it be similar to the 4.7 fps for jpg only?

Thanks.
Bill

03-31-2010, 04:38 PM   #2
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I believe the speed is the same regardless of the image format, but because of the size of the buffer, RAW is limited to 5 images vs. 17 images in JPEG. I don't use the continuous shooting mode but my guess is if you shoot at 6 megapix, you'll be able to capture at least twice as many images before the buffer fills and possibly 30 RAW images or 102 JPEGS at 2 megapix, but I could be wrong…
03-31-2010, 04:43 PM   #3
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Using a class 4 or 6 card should be no problem. That will help keep the buffer from filling and slowing down the camera
03-31-2010, 05:40 PM   #4
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Thanks for the help.

03-31-2010, 06:06 PM   #5
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QuoteOriginally posted by DSLRnoob Quote
Hello,

Does anyone know what the continuous shooting speed would be for a K-x when shooting Raw+Jpg? Would it be similar to the 4.7 fps for jpg only?
Thanks.
Bill
The K-x has a small buffer size: as soon as the buffer is full (5 RAWs), the fps will slow down drastically in Hi mode, even with a class 10 card. The problem will be worst in RAW+ mode depending upon the JPEG file size.

In Hi continuous mode, you need to select JPEG file size that allow for its continuous tranfer to the card: e.g, if your JPEG file size is 2 Mb, the car transfer rate must be at least 4.7 times 2 Mb/s.

The K-7 with its larger buffer (15 RAWs) does have the same problem: as soon as the buffer is full (or near full), the shooting rate does drop sharply.

An alternative is to use the Lo continuous shooting mode (2 fps with the K-x). The buffer filling is slower and your may take some continuous shots for a longer period, with the same camera and card.

Hope that it wil help...
03-31-2010, 07:24 PM   #6
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Buffer suffers a lot with RAW+. RAW and JPEG are much better, see other videos:

04-01-2010, 04:06 AM   #7
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QuoteOriginally posted by Eruditass Quote
Buffer suffers a lot with RAW+. RAW and JPEG are much better, see other videos:

YouTube - K x Burst RAW+
Which SD card are you using?
04-01-2010, 08:07 PM   #8
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SanDisk Extreme III 20 MB/s

04-01-2010, 10:09 PM   #9
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QuoteOriginally posted by Eruditass Quote
SanDisk Extreme III 20 MB/s
A quick clarification:
- The Sandisk SD Extreme III is rated 30 Mb/s: SanDisk | Products | Photo & Video | SanDisk Extreme SDHC Card.

- The Sandisk SD Extreme HD video is rated 20 Mb/s: SanDisk | Products | Photo & Video | SanDisk Extreme® HD Video SDHC? Cards.

Cheers... and Happy Easter to all Pentaxians.
04-02-2010, 07:34 AM   #10
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QuoteOriginally posted by hcc Quote
A quick clarification:
- The Sandisk SD Extreme III is rated 30 Mb/s: SanDisk | Products | Photo & Video | SanDisk Extreme SDHC Card.
A fast card doesn't have any bearing on the buffer speed. I have the 8 gig version of that card. Shooting smaller size files increases the limit, but not as much I as I would have thought.

Either way, to answer the OP, the camera shoots 4.7 fps regardless of format until the buffer is full.
04-02-2010, 03:50 PM   #11
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QuoteOriginally posted by JHD Quote
A fast card doesn't have any bearing on the buffer speed.
You are completely correct: a fast card does not affects the shooting rate as long as the buffer is not full. This is important to highlight; thank you.

A fast card allows to clear up the buffer memory at a faster rate. For example, a class 10 card allows to transfer 30 Mb/s from the buffer to the card. In turn a fast card allows to take a large number of photographs in Hi continuous shooting mode (4.7 fps with the K-x, 5.2 fps with K-7) before the buffer is full.
04-03-2010, 09:42 AM   #12
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QuoteOriginally posted by hcc Quote
A quick clarification:
- The Sandisk SD Extreme III is rated 30 Mb/s: SanDisk | Products | Photo & Video | SanDisk Extreme SDHC Card.

- The Sandisk SD Extreme HD video is rated 20 Mb/s: SanDisk | Products | Photo & Video | SanDisk Extreme® HD Video SDHC? Cards.

Cheers... and Happy Easter to all Pentaxians.
Correction: the Sandisk SD Extreme III is now rated to 30 MB/s. The previous version, which I have, is 20 MB/s.

Another note, the 30 MB/s is only with devices proprietary synchronization mechanisms. D90 and their card-reader were all that there were months ago. K-x and many other devices will only read/write a new 30 MB/s at 20 MB/s.
04-03-2010, 09:48 AM   #13
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Also, as you can see from the videos, the shooting speed when the buffer is full is K-x processing limited in JPEG. With ISO below 1600, the buffer is pretty much never full. Above 1600, the limit is around 17 as stated.
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