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PostPosted: Mon Jun 09, 2014 4:36 pm 
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Joined: Mon Jun 09, 2014 4:22 pm
Posts: 7
Location: Granada, Spain
Hello,
I'm having a few problems with hot pixels. I've been taking a few long exposures and I noticed that there were quite of lot of hot pixels. I don't have the long exposure mode turned on but I am quite surprised at just how many there are. The camera is about 3 months old and it's a 700D. Photo info and photo are below.

ISO - 100
Aperture - 7.1
Shutter - 148s

Cheers,
Michael

Image

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DSLR - Canon 700D
Lens - Canon EF 24-105L
Website - http://granadamike.com


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PostPosted: Thu Jun 12, 2014 3:36 am 
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Joined: Tue Jan 04, 2011 7:58 pm
Posts: 816
Location: United Kingdom
That's a lot more than I'd expect to see.

How many long exposures did you do do before that particular shot and how long an interval did you leave between them?

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DSLRs: Canon EOS 70D, 30D
Lenses: Canon EF-S 15-85mm f/3.5-5.6 IS USM, EF 50mm f/1.8 II, EF 100-400mm f/4.5-5.6L IS USM

CSCs: Panasonic DMC-GF3
Lenses: Panasonic Lumix G 14-42mm f/3.5-5.6


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PostPosted: Thu Jun 12, 2014 6:11 am 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8025
Location: UK
You will always get hot pixels showing up with long exposures, and at over two minutes, this certainly is very long! Expect to see them even as short as a few seconds exposure, although not this bad.

In this case, I fail to see why a long exposure is needed. Either jack up the ISO and/or throw more light on the subject.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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PostPosted: Thu Jun 12, 2014 10:39 am 
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Joined: Mon Jun 09, 2014 4:22 pm
Posts: 7
Location: Granada, Spain
To be honest I was just playing about. I've never taken an exposure that long before and I wanted to see what would happen. I was trying to light the whole thing with a candle. Turns out that doesn't work with an ISO of 100 haha. I had taken a few long exposures beforehand as well. Was this my sensor overheating a little? I live in Granada so it was 28ÂșC and above in the house when I did this.

Cheers,
Mike

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DSLR - Canon 700D
Lens - Canon EF 24-105L
Website - http://granadamike.com


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PostPosted: Thu Jun 12, 2014 11:27 am 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8025
Location: UK
I do photos of the night sky, and use up to 4 minute exposures. Even in the middle of winter with ice on the camera, you will still get hot pixels at those long durations.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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