Frame rate, Buffer size, Write speed

Roadboat24 · 10-06-2019, 04:13 PM

I had run across the thread discussing the new memory cards and write speeds. I got me thinking about a time when I filled the buffer on my K1 and took, what seemed at the time, a long time to clear... So, test time... Pentax K1, shutter speed 1/2000, f2.8 iso 6400, Sandisk extreme pro 32gb (95mb/s) memory cards (purchased from B&H), all extra stuff shut off (noise reduction, etc.), raw (DNG) format, firmware version 1.5.... continuous (H), 13 frames filled the buffer, 25 seconds to clear. Continuous (M), 13 frames to fill, 25 seconds to clear. ..Yes, you read that right. So what gives?. I don't use the k1 for fast frame stuff (K3 for that) but still, I thought it odd.. .I have no way to accurately test frames per second.

**bkpix** · 10-06-2019, 04:54 PM

I'm guessing that in both cases (high and medium theoretical frame rate) the camera was limited in speed by data transfer.

You can time the frame rate by photographing the stop watch app on your phone.

Adam · 10-06-2019, 06:19 PM

Originally posted by Roadboat24

I had run across the thread discussing the new memory cards and write speeds. I got me thinking about a time when I filled the buffer on my K1 and took, what seemed at the time, a long time to clear... So, test time... Pentax K1, shutter speed 1/2000, f2.8 iso 6400, Sandisk extreme pro 32gb (95mb/s) memory cards (purchased from B&H), all extra stuff shut off (noise reduction, etc.), raw (DNG) format, firmware version 1.5.... continuous (H), 13 frames filled the buffer, 25 seconds to clear. Continuous (M), 13 frames to fill, 25 seconds to clear. ..Yes, you read that right. So what gives?. I don't use the k1 for fast frame stuff (K3 for that) but still, I thought it odd.. .I have no way to accurately test frames per second.

This sounds about right. If you don't have lens corrections on you'll be able to keep shooting at a slower rate without having the camera lock up. In our review, we measured a buffer capacity of 16 in raw and 13 in raw+.

For up to 100 frames, jpeg is the way to go.

Roadboat24 · 10-06-2019, 08:54 PM

Hummm. Tried it with same settings but JPG (L ***) . 25 frames filled the buffer also took 25 sec to clear . Interesting.?.

swanlefitte · 10-06-2019, 10:40 PM

Pentax K-1 Review - Performance
Raw of 17, 31. Raw+ 13,34

**clickclick** · 10-07-2019, 02:49 PM

I've been surprised how quickly it's snuck up on my shooting RAW+. A bigger buffer will be one of the things I look forward to in the next FF release.

**barondla** · 10-08-2019, 07:22 AM

Except for wildlife or sports this doesn't seem that bad. Of course, one of my other cameras is a Sigma DP1 Merrill.
Thanks,
barondla

Martin KP · 10-31-2019, 01:29 PM

So what would be better; a KP in RAW+ or a K1 with Jpegs only? Does anyone know?

**clickclick** · 10-31-2019, 04:47 PM

HHHHmmmmm - have you looked at the tests of the cameras here on PF? Thinking they'll have this stat. Kinda an odd comparison given the differences in output and what you can do with them - one does not substitute for the other.

10-06-2019, 04:13 PM	#1
Roadboat24 Pentaxian Join Date: Jul 2017 Posts: 490	Frame rate, Buffer size, Write speed I had run across the thread discussing the new memory cards and write speeds. I got me thinking about a time when I filled the buffer on my K1 and took, what seemed at the time, a long time to clear... So, test time... Pentax K1, shutter speed 1/2000, f2.8 iso 6400, Sandisk extreme pro 32gb (95mb/s) memory cards (purchased from B&H), all extra stuff shut off (noise reduction, etc.), raw (DNG) format, firmware version 1.5.... continuous (H), 13 frames filled the buffer, 25 seconds to clear. Continuous (M), 13 frames to fill, 25 seconds to clear. ..Yes, you read that right. So what gives?. I don't use the k1 for fast frame stuff (K3 for that) but still, I thought it odd.. .I have no way to accurately test frames per second.

10-06-2019, 06:19 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by Roadboat24 I had run across the thread discussing the new memory cards and write speeds. I got me thinking about a time when I filled the buffer on my K1 and took, what seemed at the time, a long time to clear... So, test time... Pentax K1, shutter speed 1/2000, f2.8 iso 6400, Sandisk extreme pro 32gb (95mb/s) memory cards (purchased from B&H), all extra stuff shut off (noise reduction, etc.), raw (DNG) format, firmware version 1.5.... continuous (H), 13 frames filled the buffer, 25 seconds to clear. Continuous (M), 13 frames to fill, 25 seconds to clear. ..Yes, you read that right. So what gives?. I don't use the k1 for fast frame stuff (K3 for that) but still, I thought it odd.. .I have no way to accurately test frames per second. This sounds about right. If you don't have lens corrections on you'll be able to keep shooting at a slower rate without having the camera lock up. In our review, we measured a buffer capacity of 16 in raw and 13 in raw+. For up to 100 frames, jpeg is the way to go. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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10-06-2019, 04:54 PM	#2
bkpix Site Supporter Join Date: Feb 2010 Location: Creswell, Oregon Photos: Albums Posts: 570	I'm guessing that in both cases (high and medium theoretical frame rate) the camera was limited in speed by data transfer. You can time the frame rate by photographing the stop watch app on your phone.

10-06-2019, 08:54 PM	#4
Roadboat24 Pentaxian Join Date: Jul 2017 Posts: 490 Original Poster	Hummm. Tried it with same settings but JPG (L ***) . 25 frames filled the buffer also took 25 sec to clear . Interesting.?.

10-06-2019, 10:40 PM	#5
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	Pentax K-1 Review - Performance Raw of 17, 31. Raw+ 13,34

10-07-2019, 02:49 PM	#6
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,903	I've been surprised how quickly it's snuck up on my shooting RAW+. A bigger buffer will be one of the things I look forward to in the next FF release.

10-08-2019, 07:22 AM	#7
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,715	Except for wildlife or sports this doesn't seem that bad. Of course, one of my other cameras is a Sigma DP1 Merrill. Thanks, barondla

10-31-2019, 01:29 PM	#8
Martin KP Senior Member Join Date: Aug 2018 Photos: Gallery \| Albums Posts: 240	So what would be better; a KP in RAW+ or a K1 with Jpegs only? Does anyone know?

10-31-2019, 04:47 PM	#9
clickclick Loyal Site Supporter Join Date: May 2016 Location: East Coast Posts: 2,903	HHHHmmmmm - have you looked at the tests of the cameras here on PF? Thinking they'll have this stat. Kinda an odd comparison given the differences in output and what you can do with them - one does not substitute for the other.