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Sony Alpha DSLR-A900 Gordon Laing, October 2008

Sony Alpha DSLR-A900 results : Outdoor resolution / Studio resolution / High ISO Noise / Noise Reduction

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Canon 5D Mark II
Outdoor resolution - Sony Alpha A900 vs Canon EOS 1Ds Mk III vs Nikon D700

 
To compare real-life performance we shot the same scene with the Sony Alpha DSLR-A900, Canon EOS 1Ds Mark III and Nikon D700 within a few moments of each other using their best quality JPEG settings, base sensitivities and default processing options. The A900's Dynamic Range Optimizer was disabled by default.

The respective lenses (named above the cropped images) were adjusted to deliver the same vertical field of view and set to f8 for optimum sharpness.
 


The image above was taken with the Sony Alpha DSLR-A900 at a sensitivity of 100 ISO, using the Sony Carl Zeiss 24-70mm f2.8 lens at 24mm f8; the original Large Fine JPEG file measured 8.6MB. The crops are taken from the upper left, centre, lower right centre and left of centre, and are presented here at 100%. The Canon EOS 1Ds Mark III and (especially the) Nikon D700 crops show a larger area due to their lower resolutions.

The A900 may sport slightly higher resolution than the Canon 1Ds Mark III in terms of total pixels, but there's little between them in terms of real life detail in the crops below. Side-by-side the Canon's default JPEG output looks a little crisper and it enjoys a small advantage in the mountain ridge crop where it's retained some highlight detail that's been lost on the Sony, but it's still a very close-run.

With roughly half the total Megapixels, the Nikon D700 is unsurprisingly not delivering the same degree of fine detail as the Sony and Canon flagships, but considering the difference in numbers, the results aren't bad at all. It's also worth noting the Nikkor lens used here was at the long-end of its range, while the Sony and Canon lenses were at their short ends. These lenses were however selected as some of the best quality optics available for each system which shared identical coverage at some point in their range.

Ultimately both the Sony A900 and Canon EOS 1Ds Mark III bodies are capturing a massive amount of fine detail given good quality lenses, but we wouldn't place one ahead of the other in terms of real life detail. Certainly, existing owners of Canon's flagship shouldn't lie awake at night worrying they're missing out on extra detail captured by the A900 - and this bodes well for Canon's upcoming EOS 5D Mark II.

But equally, while the A900 doesn't noticeably out-resolve the flagship Canon in real-life, it is at least delivering the same kind of detail at a fraction of the price. Obviously there's other differences to take into account, but the fact Sony's delivered this degree of resolution at a much lower price than the Canon flagship is commendable - just remember Canon's upcoming 5D Mark II has the same resolution as the 1Ds Mark III, but at a launch price a little below that of the A900.

Technically the A900 does actually resolve slightly more than the Canon EOS 1Ds Mark III, but you'll need technical test charts to measure it - which we'll show you in our Sony A900 Studio resolution page. But before heading over there, scroll down to the bottom of this page to see how the A900's RAW output compares with in-camera JPEGs.



Sony Alpha DSLR-A900
with Sony Carl Zeiss 24-70mm
Canon EOS 1Ds Mark III
with Canon EF 24-105mm IS
Nikon D700
with Nikkor AF-S 14-24mm
   
f8, 100 ISO
f8, 100 ISO
f8, 200 ISO
         
   
f8, 100 ISO
f8, 100 ISO
f8, 200 ISO
         
   
f8, 100 ISO
f8, 100 ISO
f8, 200 ISO
         
   
f8, 100 ISO
f8, 100 ISO
f8, 200 ISO



Sony Alpha DSLR-A900: JPEG versus RAW


We photographed the scene here in the Sony DSLR-A900's RAW plus Large Fine JPEG mode, allowing us to directly compare images created from exactly the same data. Below are crops taken from the original JPEG file alongside the RAW version, processed in Sony's supplied Image Data Converter SR version 3.0 using the default settings.

Sometimes a converted RAW file looks dramatically different from the in-camera JPEG, but this isn't one of them. The RAW conversion has applied slightly more contrast and sharpening for a fractionally punchier result, but at the cost of some undesirable artefacts around the edges of the white buildings.

Obviously better results may be achieved with further tweaking or alternative RAW converters, but anyone hoping to see much benefit using the supplied software at its default settings will be disappointed. Now let's look at the Sony A900's resolution in a studio environment and see if we can measure any difference between JPEG and RAW files under technical conditions.

Sony Alpha DSLR-A900 JPEG
with Sony Carl Zeiss 24-70mm
 
Sony Alpha DSLR-A900 RAW
with Sony Carl Zeiss 24-70mm
f8, 100 ISO
f8, 100 ISO


Sony Alpha DSLR-A900 results continued...

Outdoor resolution / Studio resolution / High ISO Noise
/ Noise Reduction


All words, images, videos and layout, copyright 2005-2014 Gordon Laing. May not be used without permission.

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