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20 Minute Exposure of night sky, and iso temperature question

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RustyKnee

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Hi Chaps,

I went out and braved the chilly evening in the back yard last night.

I took this shot http://www.photobox.co.uk/album/89444661 . it was about 20 minutes in bulb mode, iso 200, with the kit 18-105 at F8.

let me know what you think.

Also, in cold weather, does the iso noise reduce? I have been playing with the higher isos and auto iso on my D90 and I swear it wasn't as clean in the summer as it is at the moment.

Stu
 
You're not crazy -- when the sensor is warmed up it will detect quite a bit more noise that isn't there normally. On a cold night you'll get less noise, but be careful taking it back inside the warm house! You don't want condensation to form in the camera.
 
I think the tripod may have been fine.

But it looks like whatever the tripod was standing on was spinning or something.

;o)
morris said:
It looks like your tripod or head is not that steady Stu. Yes a cold
camera will produce less nose though they warm up with use.

Morris
Click to expand...
 
haha.

would any one mind if i stopped the earth spinning for 20 minutes one night this week?

Its not the beefiest tripod, but it was free...a mate gave it to me. I would like a beefier one, but I don't use it very much so have justified it yet.

Stu
ondarock said:
But it looks like whatever the tripod was standing on was spinning or
something.

;o)
morris said:
It looks like your tripod or head is not that steady Stu. Yes a cold
camera will produce less nose though they warm up with use.

Morris
Click to expand...
Click to expand...
 
I do not think it was the tripod moving , if so why is every thing else in focus. Surely if the tripod was moving then the whole picture would show that ???
 
BenGreen said:
I think the tree looks very sharp considering it had 20 minutes to
sway about...must have been a calm night.
--
Click to expand...
--

Sorry for the late reply, didn't realise I had new posts (I don't get emailed like other forums).

It was almost dead still, the yard is pretty sheltered too.

I switched VR off to yes, and used the moon to focus on and then switch AF off too.

Stu
 
I'm guessing Morris is noticing the jagged lines on the star trails. I think that's probably due to the resizing of the photo. I notice the same thing on the resized version of a similar night photo I took.
 
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