Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-09-2014, 02:50 PM   #1
New Member




Join Date: May 2014
Posts: 3
Necessarily SD-card performance for 645Z ?

Hello
Does anyone know what is the minimum read-write performance (MB/s) of SDHC or SDXC-cards for the 645Z, so that the SD-card surely doesn't reduce the speed of the camera? Because I want order cards exclusively for the 645Z, and I prefer good quality with "necessarily" and not "oversized" performance.
Kindly regards
Rudolf

08-09-2014, 03:07 PM   #2
Administrator
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 40,978
QuoteOriginally posted by RR645 Quote
Hello
Does anyone know what is the minimum read-write performance (MB/s) of SDHC or SDXC-cards for the 645Z, so that the SD-card surely doesn't reduce the speed of the camera? Because I want order cards exclusively for the 645Z, and I prefer good quality with "necessarily" and not "oversized" performance.
Kindly regards
Rudolf
I tested this for our in-depth review. With 1.00 firmware, the 645Z maxes out at 41Mb/s for stills, so any card with a write speed of that or faster will give you optimal performance.

As far as write speed goes, we got identical results in single and burst mode (and in sequential and dual-card shooting) with a Sandisk Extreme 45Mb/s card and a Sandisk Extreme 90Mb/s card. Playback speed was about the same (very good) with both cards.

This is an interesting finding, since the K-3 was able to take full advantage of the extreme pro card. However, since we can safely assume that the overall processing power (in the PRIME III) is the same, it would make sense that the 645Z needs considerably more time to process the sensor data before/while writing it.

The one format to avoid is TIFF- it takes considerably longer to save than even RAW+, and a full burst can take almost 2 minutes to be saved.

Adam
PentaxForums.com Webmaster (Site Usage Guide | Site Help | My Photography)



PentaxForums.com's high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

08-09-2014, 04:15 PM   #3
Pentaxian
RonHendriks1966's Avatar

Join Date: Jan 2009
Photos: Gallery
Posts: 8,556
QuoteOriginally posted by Adam Quote
I tested this for our in-depth review. With 1.00 firmware, the 645Z maxes out at 41Mb/s for stills, so any card with a write speed of that or faster will give you optimal performance.

As far as write speed goes, we got identical results in single and burst mode (and in sequential and dual-card shooting) with a Sandisk Extreme 45Mb/s card and a Sandisk Extreme 90Mb/s card. Playback speed was about the same (very good) with both cards.

This is an interesting finding, since the K-3 was able to take full advantage of the extreme pro card. However, since we can safely assume that the overall processing power (in the PRIME III) is the same, it would make sense that the 645Z needs considerably more time to process the sensor data before/while writing it.

The one format to avoid is TIFF- it takes considerably longer to save than even RAW+, and a full burst can take almost 2 minutes to be saved.
I do wonder how, since I didn't get that speed in my K-3. The max of just under 45 MB/s was in my K-3 and the 645Z sounds like that.
08-09-2014, 04:33 PM   #4
Forum Member
rcdurston's Avatar

Join Date: Jun 2014
Posts: 50
I use Transcend 90mb/s 600x 64gb cards for video and stills and haven't had any issues and they run me about 27 with VAT

08-29-2014, 12:21 AM   #5
Forum Member
managger's Avatar

Join Date: Jul 2010
Location: Moscow
Photos: Gallery
Posts: 56
I've tested my SDHC Transcend cards on 645D and 645Z:
old, non UHS-I, 20 reading / 20 writing Mb/s
and new, UHS-I, 95 reading / 85 writing Mb/s

New UHS-I card does not help 645D at all - because of processor Prime II limitation.
But it helps 645Z a lot - twice faster saving files and twice longer series in RAW at speed 1.0 Fps.
So, I can not recommend old non UHS-I cards for 645Z - it's better to buy only new cards.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
645z, camera, medium format, performance, sd-card, sdhc card, sdxc cards, sdxc speeds
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
SD cards for the 645Z Thomasbrowphoto Pentax Medium Format 5 07-07-2014 11:59 AM
Measuring SD Card Performance dosdan Accessory and Memory Articles 15 04-02-2014 05:48 AM
For Sale - Sold: Fuji F550EXR, 4GB Eye-Fi SD Card, 4GB SD Card, 2 Batt + 6BQ5 Sold Items 3 09-16-2013 08:19 PM
sd card question and Pentax K7 performance Mr. Ben Pentax DSLR Discussion 8 06-30-2010 08:28 AM



All times are GMT -7. The time now is 11:38 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top