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MKD · 05-24-2015, 08:05 AM

How much do you average for file sizes for the raw (DNG) images taken with your 645Z? From what I can see, I go up to 50 megabytes or so per image, no more. The Nikon 810 I also own goes up to 70 megabytes.

The Hasselblad h5d-50c based on the same Sony sensor used in the 645Z claims of file sizes of 65 megabytes for their raw format. This has a 16bit readout (the 645Z is a 14bit like the Nikon).

Does Pentax use some sort of raw cooking/compression for their files or the Nikon ones have a lot of gibberish data to have such heavy files come out as raw?

algrove · 05-24-2015, 08:12 AM

Of course your question is image dependent and it is important to compare the same image between camera for this exercise. I have had my RAW files up to 92mb, but many are less too.

You asked about average, but I have never paid that much attention to my file sizes to determine an accurate average. Sorry.

Adam · 05-24-2015, 11:14 AM

Originally posted by MKD

How much do you average for file sizes for the raw (DNG) images taken with your 645Z? From what I can see, I go up to 50 megabytes or so per image, no more. The Nikon 810 I also own goes up to 70 megabytes.

The Hasselblad h5d-50c based on the same Sony sensor used in the 645Z claims of file sizes of 65 megabytes for their raw format. This has a 16bit readout (the 645Z is a 14bit like the Nikon).

Does Pentax use some sort of raw cooking/compression for their files or the Nikon ones have a lot of gibberish data to have such heavy files come out as raw?

There's a table with typical RAW file sizes here:
Pentax 645Z Review - Performance and Burst Mode | PentaxForums.com Reviews

Essentially, the higher the ISO the larger the file size, since compression isn't as effective when there's noise.

Kolor-Pikker · 05-24-2015, 11:32 AM

Just looked over some images I've shot over the days and file sizes range over 60-80MB, but I didn't notice any real correlation between shot settings and file sizes.

Exposure seems to have a big part in it, as the 60MB files were dark, while the 80MB files were very brightly exposed.

batmobile · 05-31-2015, 11:28 PM

I can certainly feel the difference between my A7R files and 645Z files when it comes to computer speed. The 645Z files make my laptop cough a little! 70MB is about right as an average, as stated above. Busy scenes with lots of shadow detail cause them to rise higher though.

05-24-2015, 08:05 AM	#1
MKD New Member Join Date: Dec 2014 Posts: 8	645Z raw file size How much do you average for file sizes for the raw (DNG) images taken with your 645Z? From what I can see, I go up to 50 megabytes or so per image, no more. The Nikon 810 I also own goes up to 70 megabytes. The Hasselblad h5d-50c based on the same Sony sensor used in the 645Z claims of file sizes of 65 megabytes for their raw format. This has a 16bit readout (the 645Z is a 14bit like the Nikon). Does Pentax use some sort of raw cooking/compression for their files or the Nikon ones have a lot of gibberish data to have such heavy files come out as raw?

05-24-2015, 11:14 AM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Originally posted by MKD How much do you average for file sizes for the raw (DNG) images taken with your 645Z? From what I can see, I go up to 50 megabytes or so per image, no more. The Nikon 810 I also own goes up to 70 megabytes. The Hasselblad h5d-50c based on the same Sony sensor used in the 645Z claims of file sizes of 65 megabytes for their raw format. This has a 16bit readout (the 645Z is a 14bit like the Nikon). Does Pentax use some sort of raw cooking/compression for their files or the Nikon ones have a lot of gibberish data to have such heavy files come out as raw? There's a table with typical RAW file sizes here: Pentax 645Z Review - Performance and Burst Mode \| PentaxForums.com Reviews Essentially, the higher the ISO the larger the file size, since compression isn't as effective when there's noise. 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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05-24-2015, 08:12 AM	#2
algrove Senior Member Join Date: Mar 2015 Posts: 160	Of course your question is image dependent and it is important to compare the same image between camera for this exercise. I have had my RAW files up to 92mb, but many are less too. You asked about average, but I have never paid that much attention to my file sizes to determine an accurate average. Sorry.

05-24-2015, 11:32 AM	#4
Kolor-Pikker Veteran Member Join Date: Dec 2014 Posts: 345	Just looked over some images I've shot over the days and file sizes range over 60-80MB, but I didn't notice any real correlation between shot settings and file sizes. Exposure seems to have a big part in it, as the 60MB files were dark, while the 80MB files were very brightly exposed.

05-31-2015, 11:28 PM	#5
batmobile Junior Member Join Date: Apr 2015 Posts: 47	I can certainly feel the difference between my A7R files and 645Z files when it comes to computer speed. The 645Z files make my laptop cough a little! 70MB is about right as an average, as stated above. Busy scenes with lots of shadow detail cause them to rise higher though.

645Z raw file size

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