Latest or all posts or last 15, 30, 90 or 180 days.
Memory Upgrades for 2019 Mac Pro - Save Up to 65% vs Factory Costs
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$700 $500
SAVE $200

$4499 $2999
SAVE $1500

$60 $20
SAVE $40

$1699 $1199
SAVE $500

$950 $700
SAVE $250

$1597 $997
SAVE $600

$1499 $1259
SAVE $240

$400 $360
SAVE $40

$372 $247
SAVE $125

$9999 $2999
SAVE $7000

$4500 $3500
SAVE $1000

$1000 $500
SAVE $500

$1398 $898
SAVE $500

$829 $799
SAVE $30

$935 $549
SAVE $386

$309 $259
SAVE $49

$1300 $900
SAVE $400

$450 $280
SAVE $170

$1499 $1249
SAVE $250

$700 $600
SAVE $100

$2000 $1270
SAVE $730

$1499 $779
SAVE $720

$450 $120
SAVE $330

$250 $230
SAVE $20

$3998 $3498
SAVE $500

$150 $80
SAVE $70

$369 $175
SAVE $194

$1699 $1199
SAVE $500

$649 $449
SAVE $200

$1498 $998
SAVE $500

$999 $949
SAVE $50

$1099 $999
SAVE $100

$400 $320
SAVE $80

$2399 $2199
SAVE $200

$7697 $4997
SAVE $2700

OWC Mercury Elite Pro Dock

Up to 32TB Capacity!


Dual-drive solution from 4TB to 32TB, hardware RAID, USB ports, DisplayPort, gigabit ethernet, SD card reader.

Huge capacity in travel-friendly form-factor.

Sony NEX-7 — RAW Only 8 Bits?

Sony NEX-7

I shot about 800 images today with the Sony NEX-7 using the Leica 50/1.4, Leica 28/2 and Voigtlander 35/1.2 II.

All of the Sony ARW files come out at 25MB, plus or minus a few tenths of a megabyte. This not possible unless (a) the camera records only 8 bits of data per photosite or (b) the camera is employing lossy compression of arbitrary severity to get down to 25MB. My guess is (a), but see the comments from Daan L further below, which indicate that lossy compression is being used, albeit a sophisticated version using min/max deltas (a technique I believe I think is in one of my patents, but it’s been so long I’m not sure— but I did use delta compression to compress images back in DiskDoubler days in the 90’s).

I know something about compression, having 3 compression patents to my name.

When file sizes never exceed a fixed size (25MB in the case of the NEX-7), something has to give. Well, about 4 bits per photosite to be exact, assuming a 12-bit sensor. That’s a lot.

The Sony NEX-7 has a relatively high level of noise, and thus lossy compression might in effect be throwing away “data” which is as much noise as anything else. So in context, it could be true that a loss would be very hard to detect. It would be at ISO 100 where one would have the only chance of finding a degradation, by ISO 200 the noise has grown enough that I deem it highly unlikely that the compression would be an issue, assuming it is well done, as it seems.

Noise

I’m not happy with noise at ISO 400. Sure if one doesn’t sharpen it’s not so obvious, but try sharpening and out pops very strong graininess. ISO 100 is very good, ISO 200 is OK. I shoot real images at dusk a lot— ISO 400 is perfectly usable, but a far cry from a full-frame DSLR.

There is a ton of detail in the NEX-7 images under the right conditions. And this detail is degraded as soon as the ISO goes to 200 and is noticeably degraded at ISO 400— the noise obscures detail as it always does. And makes the 8-bit or 12-bit thing a non-issue.

As far as ergonomics, the flush button to zoom in with manual focus lenses is the worst feature of the camera— hard to find and press. Couple that with the modal nature of zoomed-in focusing and it’s far from a perfect approach. But I got used to it, and had a pretty high success rate.

Manual focus

I was even able to use manual focus (zooming in) to track moving targets fairly well, so long as I centered the subject.



Hungry duck
Sony NEX-7 + Leica 50mm f/1.4

Daan L writes:

First of all, thanks for all your interesting reviews – always interesting to read.

However, I would like to correct you on the NEX7 raw format – it is certainly not 8-bits. The Sony compressed raw file (cRaw) are very smartly compressed – technically, the algorithm is not entirely loss-less but for all practical purposes one can consider it loss-less. If you study the algorithm, one can see that it would be extremely hard to ever produce an image (even artificially) where the difference can be observed; all in all, it is by far the best raw compression I know of. I explain this in more detail here: (under the alias Vivec)

https://www.dyxum.com/dforum/raw-vs-craw_topic66231_post745209.html#745209

I explain the algorithm with some concrete numbers here:
https://www.dyxum.com/dforum/forum_posts.asp?TID=77030&PID=887425&title=craw-versus-xfine-on-a900#887425

Richard J writes

Thanks for printing what I have been thinking about the sony 24mp files, everyone has been saying how wonderful they are but I just haven't felt that way from what I have seen. As for the raw being an 8 bit file would this not become evident in the dynamic range and color depth numbers of the sensor witch seem to compare very well with a 5d mkII ?

DIGLLOYD: speaking subjectively based on my impressions, I think the Sony files compare favorably to the Canon 5D Mark II at ISO 100, but as the ISO rises, the noise rises more quickly with the Sony. The Nikon D3x is superior to both, but it’s huge and heavy. I’d love to see a Sony NEX with a full frame sensor that is 24MP; I bet it would perform at a much higher level.

OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!
OWC Envoy Pro EX SSD
Blazingly fast USB-C SSD!

Up to 4TB capacity, USB-C compatible with Thunderbolt 3.

√ Fastest USB drive MPG has tested!

Save the tax, we pay you back, instantly!
View all handpicked deals...

Apple 15.4" MacBook Pro with Touch Bar (Mid 2018, Space Gray)
$4499 $2999
SAVE $1500

diglloyd Inc. | FTC Disclosure | PRIVACY POLICY | Trademarks | Terms of Use
Contact | About Lloyd Chambers | Consulting | Photo Tours
RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.