problems with photos taken outside at cold temperature

[matrad]

Wile taking photos with my A70 outside at cold temperature I notice noise in the picture even if I use ISO 50-100

Any comments?

[S45_fornow...]

Could you post an example pic? Maybe the lens was fogged a little??

[morim]

How cold was it? :roll:

/morim

[matrad]

cold? I don't know exact temperature...I think 5°C and below


lens? no fogged-I check


example

http://www.photo.net/photodb/photo?photo_id=2084335

(large superfine)

[platinumdoc]

From my understanding, these digital cameras optimally run in temps from 30 F to 90 F. Check your manual for specifics.

[mvrekum]

cold? I don't know exact temperature...I think 5°C and below


lens? no fogged-I check


example

http://www.photo.net/photodb/photo?photo_id=2084335

(large superfine)

There is a note in the manual about the temperature in which the camera operates best. Please don't ask me on what page. :)

[matrad]

manual says

0-40°C

[Heimdall]

hmm... last weekend I took 20 pics, and some movie shots, up in the mountains here in Austria. Guess it was like -8 or -10 degrees celsius. I had the camera in an ouside, non-insulated pocket. Pictures looks nice. I was ouside for 4-5 hours.

Knut

[Conk]

Wile taking photos with my A70 outside at cold temperature I notice noise in the picture even if I use ISO 50-100

Any comments?
If your camera had not been outside for too long before taking photos then it is possible that you had condensation on the sensor. You may not have seen any on the lens which may lead you to believe that there was no condensation at all. It is a good idea to let your camera reach lower temperatures slowly before taking photos.

[Icecamp]

I have seen the same effect on some of my pictures scanned with my Canoscan 2720. I don't think it really has anything to do with the temperature. I have read this effect is called aliasing. It has something to do with the resolution(pixels per inch)and jpeg compression. I think your iso setting affects this effect also.
http://goinside.com/03/2/digital.html
Neat Image does a fantastic job of reducing this noise, you can pick up a copy for your own personal use for free from their website.
http://www.neatimage.com/
A high quality RAW or Tiff should eliminate this effect. Unfortunately the A70 doesn't offer the RAW format.
From my own experience with an S30, I experienced none of this noise while shooting on Alaska's North Slope near Prudhoe Bay. The temperature rarely got above -20F and exceeded -40 on some days. This was in the Spring! Anyway Neat Image should take care of that noise.

Jim