Pentax 645D vs Sony A7R RAW

ElrondElensar · 11-11-2013, 10:57 PM

Originally posted by JohnBee

Have you considered the DR spec?

All three are over 14 stops and the 0.5 stop difference could happen even among same cameras due to sample variation. Dxomark originally listed A7R at 14.4 EV for DR but later changed it to 14.1, again probably just a sample variation if they were testing more than one model

**Digitalis** · 11-11-2013, 11:56 PM

Originally posted by ElrondElensar

Dxomark originally listed A7R at 14.4 EV for DR but later changed it to 14.1, again probably just a sample variation if they were testing more than one model

If there is that much sample variation going on with Sony's sensor fabrication something is rotten in the state of Denmark.

ElrondElensar · 11-12-2013, 01:55 AM

Originally posted by Digitalis

If there is that much sample variation going on with Sony's sensor fabrication something is rotten in the state of Denmark.

0.3 EV is that great sample variation? Really? Thats a news to be. Dxomark states that total point difference needs to be greater than 5 points for the difference to be visible to a human eye. D800 and A7R score 95 points, and D800E 96, totally irrelevant sample variation.

By the way, dxomark has examples where sample variation (or margin of errors) are much bigger than that. Look at even much bigger (far bigger) DR score between RX1 and RX1R

Sony RX1R vs Sony RX1 - DxOMark

even though we know for a fact that both sensors are identical.

Doesn't prove a thing.

A7R and D800 scores are identical on dxomark, just as I stated initially.

JohnBee · 11-12-2013, 02:29 AM

Originally posted by ElrondElensar

even though we know for a fact that both sensors are identical.

Doesn't prove a thing.

A7R and D800 scores are identical on dxomark, just as I stated initially.

Identical sensors don't mean identical performance. Which holds especially true across systems.

ElrondElensar · 11-12-2013, 11:31 AM

Originally posted by JohnBee

Identical sensors don't mean identical performance. Which holds especially true across systems.

I didn't say the sensor were identical. The performance is identical according to dxomark.

**Digitalis** · 11-12-2013, 05:21 PM

Originally posted by ElrondElensar

we know for a fact that both sensors are identical.

Originally posted by ElrondElensar

I didn't say the sensor were identical.

hmmm...Like the differences between the K10D and the nikon D200?

jdie · 11-21-2013, 09:51 PM

Hi! Great comparation
I want to calibrate my a7r by 645d colors =)
could you post a 7r raw file?
Thanks!

lenticular · 06-10-2015, 09:23 PM

Here is one via Dropbox public link: https://dl.dropboxusercontent.com/u/57748725/_DSC0894.ARW

06-10-2015, 09:23 PM	#23
lenticular Senior Member Join Date: Jun 2013 Location: Canberra Photos: Gallery \| Albums Posts: 199	A7R RAW file Here is one via Dropbox public link: https://dl.dropboxusercontent.com/u/57748725/_DSC0894.ARW

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11-11-2013, 10:57 PM	#16
ElrondElensar Junior Member Join Date: Jan 2012 Posts: 43	Originally posted by JohnBee Have you considered the DR spec? All three are over 14 stops and the 0.5 stop difference could happen even among same cameras due to sample variation. Dxomark originally listed A7R at 14.4 EV for DR but later changed it to 14.1, again probably just a sample variation if they were testing more than one model

11-11-2013, 11:56 PM	#17
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by ElrondElensar Dxomark originally listed A7R at 14.4 EV for DR but later changed it to 14.1, again probably just a sample variation if they were testing more than one model If there is that much sample variation going on with Sony's sensor fabrication something is rotten in the state of Denmark.

11-12-2013, 01:55 AM	#18
ElrondElensar Junior Member Join Date: Jan 2012 Posts: 43	Originally posted by Digitalis If there is that much sample variation going on with Sony's sensor fabrication something is rotten in the state of Denmark. 0.3 EV is that great sample variation? Really? Thats a news to be. Dxomark states that total point difference needs to be greater than 5 points for the difference to be visible to a human eye. D800 and A7R score 95 points, and D800E 96, totally irrelevant sample variation. By the way, dxomark has examples where sample variation (or margin of errors) are much bigger than that. Look at even much bigger (far bigger) DR score between RX1 and RX1R Sony RX1R vs Sony RX1 - DxOMark even though we know for a fact that both sensors are identical. Doesn't prove a thing. A7R and D800 scores are identical on dxomark, just as I stated initially.

11-12-2013, 02:29 AM	#19
JohnBee Veteran Member Join Date: Sep 2008 Location: Newrfoundland Photos: Albums Posts: 4,667 Original Poster	Originally posted by ElrondElensar even though we know for a fact that both sensors are identical. Doesn't prove a thing. A7R and D800 scores are identical on dxomark, just as I stated initially. Identical sensors don't mean identical performance. Which holds especially true across systems.

11-12-2013, 11:31 AM	#20
ElrondElensar Junior Member Join Date: Jan 2012 Posts: 43	Originally posted by JohnBee Identical sensors don't mean identical performance. Which holds especially true across systems. I didn't say the sensor were identical. The performance is identical according to dxomark.

11-12-2013, 05:21 PM	#21
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by ElrondElensar we know for a fact that both sensors are identical. Originally posted by ElrondElensar I didn't say the sensor were identical. hmmm...Like the differences between the K10D and the nikon D200?

11-21-2013, 09:51 PM	#22
jdie New Member Join Date: Nov 2013 Posts: 1	Hi! Great comparation I want to calibrate my a7r by 645d colors =) could you post a 7r raw file? Thanks!