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I did an interesting experiment too last night, in an attempt to challenge conventional wisdom. I was shooting stars with multiple minute exposures hoping to catch some trails, with NR on and off.

Was my first real time exercising the ML-L3, which made shooting bulb less tedious than manually holding the shutter release down for the duration of the exposure.

To my surprise NR off had less undesireable noise, the NR removed the conventional random pixel noise as well as the magenta colour cast in the top left of frame, but introduced artifacts of its own. Bright, visible, more objectional (IMHO) artifacts at that.

Just wanted to see if this is reflected in other people's use.

Images to come.

Happy New Year Onyx

I think I have read a similar comment elsewhere, but can't recall exactly where it was. It may have been in Phil Askey's D70 review - I'll check.

I haven't done much of this type of photography - but I'd like to see your pix.

Happy NY Cricketfan,

Some examples to illustrate:

NR off (100% crop)

NR on (100% crop)

It seems to me more noise is present with NR on.

Certainly on those two pix - having NR ON gives significantly more noise.

You should stop locking down the mirror and shooting the sensor with rock salt Onyx. If that's not it than I don't know what it is, but try putting away the 12 gauge and see if that helps...

onyx
i took this long exposure ( 669 seconds ) and when i zoomed in on it in ps there were hundreds of red green blue pixels i had to clone out. thought my cam was broken.. cant remember if i had nr on or off

hope this works

http://newton-i.usefilm.com/2/2/2/1/222 ... -small.jpg

robw25 that's definately NR off. With NR on you would not get the purple splotches in the top left.

Onyx, i've had a look at some of my astronomy photos and i also have that strange noise on NR ON images.

Hopefully this is fixed in the mysterious Firmware 1.0.3 upgrade

i did a bunch of 30 minute + star shots last night ... even with NR on there is some noise / artifacts

this arena is the ONLY aspect of a 300D that i miss. (ive owned both.) Of course its far outweighed by its many better traits

limitation of the CCD folks.

Will post my images in the next few housr after i clean them up in CS (new years eve pics too.)

here they are ... i didnt shoot RAW mind you.

does NR still remove the over-heating pink tinge when shooting RAW? Any digital sensor at 30 mionutes is going to get hot pixels ... i guess going back to film would be the better option, or stacking images, but then you'd have to run higher ISO and still end up with noise.

These were just shot jpeg ;

Camera NR ON
http://darb.net/photos/ny04/DSC_5411.jpg
Same Image After Noise Ninja and then resharpened in CS ;
http://darb.net/photos/ny04/DSC_5411_noiseninja.jpg


Camera NR ON
http://darb.net/photos/ny04/DSC_5416.jpg
Same Image after Noise Ninja then resharpened in CS ;
http://darb.net/photos/ny04/DSC_5416_noise_ninja.jpg




Camera NR OFF - pink tinge from overheat is cropped
http://darb.net/photos/ny04/DSC_5412.jpg

Same Image through noise ninja and resharpen ... doesnt fix hot pixels
http://darb.net/photos/ny04/DSC_5412_noise_ninja.jpg