ISO comparison, Nikon D80 vs Sony a100 !

Started Aug 10, 2006 | Discussions
ArtFedorov Regular Member • Posts: 249
ISO comparison, Nikon D80 vs Sony a100 !

As this thread has only 7 posts over 45 minutes, means nobody realised that it has link to site comparing iso noise on D80 vs a100 (up to ISO 1600)!
http://forums.dpreview.com/forums/readflat.asp?forum=1034&message=19530324

Keep in mind that Alpha's pictures are underexposed compared to D80's. Info from Japanese site. Thanks to takaJ for link.

OP ArtFedorov Regular Member • Posts: 249
Re: ISO comparison, Nikon D80 vs Sony a100 !
uuronl Senior Member • Posts: 1,672
Wow, I'm really impressed

I'm super impressed. The detail is very good even at ISO 1600, and the color holds up and doesn't wash out. It also appears to have all the shadow detail of the lower ISO shots. This is truly an upgrade compared to the existing 10Mpxl + Nikon offerings in the noise department.

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OP ArtFedorov Regular Member • Posts: 249
Direct comparison

Here, I prepared two files:

Nikon D80 200/1600 ISO (jpeg saved at 92% quality)

Sony a100 200/1600 ISO (jpeg saved at 92% quality)

EXIF:

D80 @ ISO 200, f/3.5, 1/2
D80 @ ISO 1600, f/3.5, 1/20
a100 @ ISO 200, f/3.5, 1/8
a100 @ ISO 1600, f/4.5, 1/40

a100 underexposes quite a bit, but look at detail retention in D80! It's fantastic, never seen anything like that in 1600 shot, even from my D50! (well, maybe I haven't ever looked at iso 1600 at 100%)

bobmax Veteran Member • Posts: 6,380
That's Dramatic.... Wonder how..

It will compare in high ISO w/the D50.... As the D50 does a great job of high ISO.

Bob
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OP ArtFedorov Regular Member • Posts: 249
Direct comparison - Shadow noise

Ok, the same image, the WORST shadow noise I could find

Nikon D80

Sony a100

Obviously, details are lost in D80, but look at Sony!

Bill Karadimos Veteran Member • Posts: 4,675
D70 iso 800

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Ronnie T Contributing Member • Posts: 573
Re: Direct comparison - Shadow noise

To be fair to Sony, the Sony pics are underexposed so it shows the noise more.

I will still want to see a fair comparison. I hope they will include the D200 too!

OP ArtFedorov Regular Member • Posts: 249
Re: Direct comparison - Shadow noise

To be fair to Sony, the Sony pics are underexposed so it shows the
noise more.

Yep, but look at first pic, ISO 200 vs 1600 on D80, no noise and almost all details are there! Remarkable!

I will still want to see a fair comparison. I hope they will
include the D200 too!

I hope too Phil would hurry with review.

Steve Bingham
Steve Bingham Forum Pro • Posts: 27,678
Wow. Pretty dramatic difference!

Thanks for the post. The D80 has a LOT LESS noise than the Sony. I wonder how come as they are both using the same chip. Very interesting!
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brianhare Senior Member • Posts: 1,677
Re: ISO comparison, Nikon D80 vs Sony a100 !

Thanks for the link,i've been staying out of these threads,lot of negativity about a camera we know almost nothing about,i think a pile of people will be in reflection on their previous posts when a good solid review finally hits,can't wait till Phil gets a full review up,there is an awful lot of new/better additions to this camera,i expect it'll sell beyond everyones belief,,the low noise is no suprize to me,i pretty much guessed that it would at least be close to or equal the D50.The D50 shows they are hard at work on this issue,,and that processing can do a lot in alleviating it to a large extent.I'll now sit and patently await the reviews and go from there,looks like i may be upgrading about a year sooner than i expected..
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Quest21 Senior Member • Posts: 1,873
Re: ISO comparison, Nikon D80 vs Sony a100 !

Very clean high iso.
Looks like I might get this camera after all...

ArtFedorov wrote:

As this thread has only 7 posts over 45 minutes, means nobody
realised that it has link to site comparing iso noise on D80 vs
a100 (up to ISO 1600)!
http://forums.dpreview.com/forums/readflat.asp?forum=1034&message=19530324

Keep in mind that Alpha's pictures are underexposed compared to
D80's. Info from Japanese site. Thanks to takaJ for link.

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LiveM Veteran Member • Posts: 3,835
Re: Direct comparison

That's not a direct comparison, that's overexposed versus normally exposed. Of course there is more noise with lower exposure.

What a ridiculous post.

ArtFedorov wrote:

Here, I prepared two files:

Nikon D80 200/1600 ISO (jpeg saved at 92% quality)

Sony a100 200/1600 ISO (jpeg saved at 92% quality)

EXIF:

D80 @ ISO 200, f/3.5, 1/2
D80 @ ISO 1600, f/3.5, 1/20
a100 @ ISO 200, f/3.5, 1/8
a100 @ ISO 1600, f/4.5, 1/40

a100 underexposes quite a bit, but look at detail retention in D80!
It's fantastic, never seen anything like that in 1600 shot, even
from my D50! (well, maybe I haven't ever looked at iso 1600 at 100%)

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OP ArtFedorov Regular Member • Posts: 249
Re: Direct comparison

Martin Caie wrote:

That's not a direct comparison, that's overexposed versus normally
exposed. Of course there is more noise with lower exposure.

First, it's normally exposed versus underexposed

Second, you don't understand the point of comparison. It's about detail retention under 1600 ISO in D80, Sony's shots are given for information purposes only, it's clearly written, because of underexposure.

For those who interested, I've calculated exposure for both high-iso shots It's 3.7 EV for D80 and 5.1 EV for a100. Sony underexposes for 1.4 EV, take it FWIW.

OP ArtFedorov Regular Member • Posts: 249
Smearing

Detail smearing on high ISOs in D80 is still present, crops taken from the near-corner of the frame. Remeber, it's shot with pre-production D80.

Bernard Languillier Veteran Member • Posts: 4,672
Obviously...

... no camera currently delivers the same image quality at base and high ISO.

What people are raving about is the fact that the gap is fairly small.

There is indeed some degree of smearing, but a lot of detail is still preserved and prints should look really good IMHO.

Cheers,
Bernard

AdamT
AdamT Forum Pro • Posts: 61,750
No Antishake = better cooling?

CCDs get warm almost instantly, the Antishake platform on the A100 means that the CCD can't be heatsinked to provide cooling - maybe this has something to do with it? .. Also the Signal Amps in the Nikon maybe lower noise ..

producing a 10Mp DSLR with AS and all the boxes ticked for £569 with an 18-70 lens included, something has to give, component quality (CCD amps etc) may have been part of the cost cutting..

Also in-cam NR has a lot to do with this also, I'd expect that Sony would use the most as all their other cams such as the R1, T series, H series, P200 etc are absolutely Loaded with it even at lowest ISO but Nikon could have upped theirs at higher ISOs ..

the only way to check for noise is to run all the cams through ACR with the Lum NR full OFF and compare, the R1 produces pretty heavily mottled blue skies even at lowest ISO, you can see a small amount of noise at ISO200 on the Canon 20D and Fuji S3 even - comparing JPG engines for noise is pointless unless you're buying a cam totally for point and print high ISO performance and for that Canon & Fuji always win as they have the best noise reduction routines

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clock Regular Member • Posts: 267
the mouse ran up the

Wonderful detail at high ISO. v Good, Basil/Bill/Vassili,

OP ArtFedorov Regular Member • Posts: 249
Re: No Antishake = better cooling?

I guess the 1.4 EV underexposure on Sony Alpha 100 is the main explanation of the differences

Having almost one-and-a-half stop underexposure on Sony, it's pretty difficult to compare them.

kawak Regular Member • Posts: 120
Re: No Antishake = better cooling?

+ iso 1600 on sony is actually iso 2000...just like canon

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