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What Happened???

By conrad  
I could really do with some help on this one - I don't understand what happened here.

This is straight from the camera. Have a good look, and you'll know what I mean (especially if you view the large version). What is that? Colour noise maybe? (Don't have any experience with that.)

And how did it get there? Don't just say "long exposure" - I've taken lots of long exposures over the years, and never seen anything like this.

FYI, here are my settings: Manual, ISO 100, 16mm, 30 sec., f14. Taken with the camera on a tripod, of course.

Any ideas?

Tags: General Bridge Night Arnhem Landscape and travel Need help What happened here

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Comments


Coleslaw 14 13.4k 28 Wales
20 Sep 2008 7:36PM
flare?

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conrad 15 10.9k 116
20 Sep 2008 7:40PM
Have a good look at the water, and some parts of the sky. As if someone had sprinkled glitter over it. Very strange.
edrhodes 14 547 12 United Kingdom
20 Sep 2008 7:46PM
Did you use any grads or a CP?
conrad 15 10.9k 116
20 Sep 2008 7:47PM
Cokin 121F, no CP. But I've used that grad so often for long exposures. Never seen anything like this.
dougv 15 8.4k 3 England
20 Sep 2008 7:51PM
Quite possible that it is a bit of colour noise Conrad.
The bottom right hand corner seems quite noisy on my monitor.

Thirty seconds isn't that long an exposure really but I wonder how warm the camera was.
If it was quite warm then it may have contributed a bit of sensor amplifier noise.

Did you use the long exposure function on the 20D?
conrad 15 10.9k 116
20 Sep 2008 7:55PM
Er... there is a special long exposure function? Feel silly now. Obviously don't know my camera as well as I should. I just had it in manual mode and was shooting from sunset until dusk. And this being the last photo of the series, the camera would have been warm by that time, yes.

So where do I find this long exposure function you're on about, and what does it do that's better than what I did?
Coleslaw 14 13.4k 28 Wales
20 Sep 2008 7:57PM
I agree with Doug as all I see is just a rather noisy shot. Nothing weird really, even though I am pretty surprised how noisy it is at ISO100. But then long exposure do tends to increase the noise.
Don't know really.

* I supposed Doug meant long exposure noise reduction on 20D.
dougv 15 8.4k 3 England
20 Sep 2008 7:59PM
Custom Function 2 from the menu Conrad.
It takes a second exposure that is blank and uses that to remove any noise from the original frame.
conrad 15 10.9k 116
20 Sep 2008 8:10PM
Ah, sounds good - I'll have to look at that one.

Well, I suppose this'll teach me that I should re-read the manual now and then!

Thanks, guys!
Coleslaw 14 13.4k 28 Wales
20 Sep 2008 8:12PM
remember though, using noise reduction function will double the processing time in camera. so for a 30 sec exposure shot, you will have to wait for 60 sec or so to be able to view the photo on the LCD.
conrad 15 10.9k 116
20 Sep 2008 8:14PM
Well, I may be a relatively impatient person, but not that impatient, fortunately! Thanks, Cole.
Carabosse 16 41.3k 270 England
20 Sep 2008 10:16PM
Nice pic! Grin

Agree with the comments above. Also, if I'm not mistaken you may have some dust on your sensor (visible in the sky area). I've cloned these out and tweaked the lighting a bit in the mod I've uploaded.
chuckspics 12 14 United States
20 Sep 2008 11:55PM

Quote:Nice pic!

Agree with the comments above. Also, if I'm not mistaken you may have some dust on your sensor (visible in the sky area). I've cloned these out and tweaked the lighting a bit in the mod I've uploaded.



I agree good be dirty sensors, nice scene, Chuck
redstag 13 100 15 United Kingdom
21 Sep 2008 9:51AM
Were you using a filter? Was there a light source to the right of you? This looks like light hitting the filter and picking out the imperfections in the filter. I also think the shot may be a bit underexposed, so the shadow to the right shows a lot of noise.

If there was light coming in from the right, simply use your hand to sheild the filter.

As for the 'glitter' you mention I get this problem with smaller apertures, but at f14 it should be OK. Did you bracket the exposure it would be interesting to see if the effect gets better or worse if over exposed.

Not sure that this is very helpful, but hope it is.

Jon
redstag 13 100 15 United Kingdom
21 Sep 2008 9:52AM
Forgot to ask, was there any wind?

Jon
conrad 15 10.9k 116
21 Sep 2008 1:56PM
I know about the dust, CB. But I just wanted to show the picture as it came from the camera, so I didn't tweak or clone anything at all.

Jon - Yes, grad filter. Source of light to the right? Well, not immediately to the right, but look at the line of street lights, that line continued along the bank of the river, so yes, somewhere to the right (but not too nearby) there were some sources of light.

As far as underexposing is concerned, I did underexpose slightly - very slightly. I usually find that this works better than having the exposure spot on according to the camera, or worse: overexposing. I had been bracketing until a few images before this one, but my card was almost full, so for the last few images (this was the last one) I didn't bracket anymore.

And next time I really must remember to take along the lens hood, I keep forgetting that.

There was some wind, but not very strong.

Thanks, everyone - very helpful comments!
jdenman 11 19 5 Spain
22 Sep 2008 2:43PM
Have had the same thing happen to me, one exposure will be fine and then the next has as you say glitter on it.
John
conrad 15 10.9k 116
29 Sep 2008 10:00AM
Thanks, John!
conrad 15 10.9k 116
30 Sep 2008 8:52AM
Thanks for the mod, Marc - certainly makes for a more striking image!

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