K-x Continuous Shooting Raw +

DSLRnoob · 03-31-2010, 04:11 PM

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

JHD · 03-31-2010, 04:38 PM

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…

ggeorge11 · 03-31-2010, 04:43 PM

Using a class 4 or 6 card should be no problem. That will help keep the buffer from filling and slowing down the camera

DSLRnoob · 03-31-2010, 05:40 PM

Thanks for the help.

hcc · 03-31-2010, 06:06 PM

Originally posted by DSLRnoob

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...

Eruditass · 03-31-2010, 07:24 PM

Buffer suffers a lot with RAW+. RAW and JPEG are much better, see other videos:

You Tube

Xcessiv · 04-01-2010, 04:06 AM

Originally posted by Eruditass

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?

Eruditass · 04-01-2010, 08:07 PM

SanDisk Extreme III 20 MB/s

hcc · 04-01-2010, 10:09 PM

Originally posted by Eruditass

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

.

JHD · 04-02-2010, 07:34 AM

Originally posted by hcc

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.

hcc · 04-02-2010, 03:50 PM

Originally posted by JHD

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.

Eruditass · 04-03-2010, 09:42 AM

Originally posted by hcc

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.

Eruditass · 04-03-2010, 09:48 AM

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.

03-31-2010, 04:11 PM	#1
DSLRnoob Inactive Account Join Date: Oct 2009 Posts: 37	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

04-01-2010, 10:09 PM	#9
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 3,926	Originally posted by Eruditass 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.

04-03-2010, 09:42 AM	#12
Eruditass Veteran Member Join Date: Jul 2009 Photos: Gallery Posts: 2,207	Originally posted by hcc 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.

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03-31-2010, 04:38 PM	#2
JHD Veteran Member Join Date: Jan 2010 Photos: Albums Posts: 1,406	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
ggeorge11 Inactive Account Join Date: Dec 2009 Location: Central Texas Photos: Albums Posts: 218	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
DSLRnoob Inactive Account Join Date: Oct 2009 Posts: 37 Original Poster	Thanks for the help.

03-31-2010, 06:06 PM	#5
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 3,926	Originally posted by DSLRnoob 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...

04-01-2010, 04:06 AM	#7
Xcessiv New Member Join Date: Feb 2010 Posts: 13	Originally posted by Eruditass 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
Eruditass Veteran Member Join Date: Jul 2009 Photos: Gallery Posts: 2,207	SanDisk Extreme III 20 MB/s

04-02-2010, 07:34 AM	#10
JHD Veteran Member Join Date: Jan 2010 Photos: Albums Posts: 1,406	Originally posted by hcc 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
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 3,926	Originally posted by JHD 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, 09:48 AM	#13
Eruditass Veteran Member Join Date: Jul 2009 Photos: Gallery Posts: 2,207	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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