Quick question... How do you guys find the noise-handling on your sonys?
I have a sony a100... my tech tutor questioned me why my images were so grainy at IS0 1600, and I was like 'cause i was shooting at ISO 1600!' but she thought they were noisier than they should have been! (my fault or noise-handling of the camera?)
But yeah, i think i read somewhere that Sony had that problem, is it just the A100?
Noise handling with the A100 is an aquired skill. There are many schools of thought, including those that think it's unusable over iso 400. Personally I don't subscribe to this idea. The A100 is perfectly capable of producing good results at high iso and it records a staggering amount of detail too, if used correctly.
This is iso 800:
I've got iso 800 & 1600 images on Alamy.
As already mentioned, firmware v1.04 helps but it's only part of the story.
The first thing you have to accept is that Sony appear to have approached noise handling with a different philosophy to the competition. They have concentrated on retaining detail over noise reduction and have tried to make the consequential grain appear more like film grain than the white noise you tend to see in most noisey images. With the A100 they were successful only to a point.
If you keep the exposure within the parameters that the camera can cope with you will get great results. That means that you need to concentrate on getting the exposure spot on. Expose to the right of the histogram.
The A100 has a tendency to underexpose to protect the highlights, which will always result in noise. If you are shooting in low light and including bright light sources like tungsten lights in the image you are likely to see bad chroma noise and banding.
This leads on to the other reason for noise in the Sony line-up. DRO.
The way that DRO works is different to the way that other manufacturers approach extending dynamic range. Most manufacturers throw a tone curve at the image, rather like you'd do in PP with photoshop. DRO identifies dark areas of the image and amplifies the signal from the sensor to increase the detail, effectively increasing the iso locally in that area. Whilst this works superbly with a well exposed image, with low light shooting it can cause a great deal of noise in your JPEGs.
So to summarise; Make sure you have firmware v1.04, get your exposure right, shoot to the right of the histogram, be prepared to back off the DRO in some situations and there is one more thing, buy some noise reduction software! The A100 is brilliant but flawed. There will be times when you just can't avoid the noise. Some noise software will help immensly. I use Neat Image to attack Chroma noise quite aggresively and luminance noise just a little, but there are many packages out there which work as well.