Noise in images

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I have just bought a Sigma 150-500mm f5- f6.3 and owing to low light 5todaycI upped the iso from my normal 100 to 400,to obatain a higher shutter speed for hand held shooting- could this produce excess noise using a long lens??

Les :shrug:

heres an example of what I mean, left side for example, seems a tad too noisey


Mallard 2 by Lez325, on Flickr
 
Anytime you increase the iso it's going to increase the noise ,not sure if it's because of the lens or not but I'm sure someone with a bit more knowledge than me will be along shortly .
 
Did you use the sony software to process it or something else? Might be worth trying sony's own if you shot RAW.

I don't remember iso 400 being very noticeably noisy on my a350. It has the same sensor as your 390.

Also worth trying some exposure compensation and fiddling with the DRO settings. DRO can introduce noise in shadow areas.
 
I suppose what you could do is create masks in your processing software and use heavy noise reduction on the out of focus background on one mask and less on the bird in another. That might do it.
 
Have you got the latest version of acr as some of the earlier versions didn't handle noise from sony's too well, or as said try using sony's software then open in ps, one of the biggest things I've noticed since upgrading my body is the better high iso noise
 
Noisewise it doesn't look too bad to me. Looking at the largest version on Flickr, what I can see is that the background is mostly black but with some slightly brighter patches. If it were me, I'd try taking the brightness down and the contrast up a bit in your software. This should produce a more uniform black background.
 
Thanks Guys- I plan to have anpother go atPP - I now have Photoshop CS5 Extended and the Forgotten manual by Scott Kelby- so Im reading up on Noise issues and how to rectify them, ISO 400 will be a long forgotten setting, I'll be shooting on a tripod or monopod in future with the 150-500mm @ iso 100

Thanks to all who took the time to comment :D


Les :thumbs:
 
I've got the same lens although on a Canon 40D and have absolutley no problems shooting at iso 400. I try to avoid going as high as 1600 but have just got back from Uganda where I had no choice but to go this high for some shots and they came out ok. Sometimes lighting and the object of your shot will dictate that iso 100 won't be enough and you'll have to go higher. 400 isn't particularly high anyway and your camera should be more than capable of handling it.
 
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