Red and Blues...

[faisal]

http://img178.imageshack.us/img178/3558/img7043ze7.jpg
EF-S18-55mm f/3.5-5.6, 18.0 mm, 30Sec, f5.0, ISO 100

http://img168.imageshack.us/img168/7178/img7046xr2.jpg
EF-S18-55mm f/3.5-5.6, 18.0 mm, 33Sec, f3.5, ISO 100

http://img178.imageshack.us/img178/7236/img7049zt7.jpg
EF-S18-55mm f/3.5-5.6, 18.0 mm, 60Sec, f3.5, ISO 100

What have I done wrong on all the above pics to give me this redness....is it because of the long shutter speed..??

http://img164.imageshack.us/img164/3997/img7050lp7.jpg
EF-S18-55mm f/3.5-5.6, 18.0 mm, 30Sec, f5.0, ISO 100

And here...why are the stars blue???

[griptape]

Pick up a gray card and set your white balance manually. Or shoot raw and change it after the fact.

[Zoinac]

The redness comes from the white balance. Lights shine differently depending on the temperature of the light they produce. Often with night shots the auto white balance functions of your camera won't balance well for the lights. You could either select a specific white balance mode, such as tungsten. Or, you could adjust the white balance in post processing.

With the stars, they look pretty white to me. Though, stars to tend to pick up a little color dew to the light passing through our atmosphere.

[faisal]

so its all to do with my White balance and not the shutter speed..hmm...good that I shot these in RAW....thanks

@griptape....a grey card...so can it be any grey colored thing like a grey cardboard??

@Zoniac....The stars that are not soo bright are the ones that look blueish...

[michaelb]

... good that I shot these in RAW....

That's why I shoot mostly in RAW; so easy to adjust WB.

[D Thompson]

It actually may be the use of the long shutter speeds. It looks to me as if there is a little more going on than just white balance off. Back in the film days there was a thing called color reciprocity failure where you would get color shifts in exposures generally longer than 1 second. I'm not sure if this still applies to the digital realm or not. Maybe someone else will know.

[seo]

It actually may be the use of the long shutter speeds. It looks to me as if there is a little more going on than just white balance off. Back in the film days there was a thing called color reciprocity failure where you would get color shifts in exposures generally longer than 1 second. I'm not sure if this still applies to the digital realm or not. Maybe someone else will know.

I thought reciprocity failure was not an issue with digital sensors, but I could be wrong.

[D Thompson]

I thought reciprocity failure was not an issue with digital sensors, but I could be wrong.
I don't know, just thought I'd throw it out there. Hopefully someone smarter will know. ;)

[Zoinac]

I'm pretty sure that it's a chemical thing that causes the failure. I was taught aswell that digital doesn't suffer from that. I do get pixels that will go solid one color on long exposures.. if it's a star shot I just count them as red or blue stars. :-p

[cyberpac9]

@griptape....a grey card...so can it be any grey colored thing like a grey cardboard??

no, not any ole grey card....google grey card and there are samples you can download and instructions...