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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 08 Apr 2012 (Sunday) 12:21
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Is this dust on the lens or the filter? Or something else?

 
mndoci
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Apr 08, 2012 12:21 |  #1

Here are two pictures

They were taken about a week apart in very different light conditions with a 7D and 70-200 F/4 IS.

IMAGE: http://img.skitch.com/20120408-fbww93aq8i7h4qhw6cgh46xbxc.preview.jpg
IMAGE LINK: http://skitch.com/mndo​ci/8txh1/img-8118  (external link) Click for large view (external link) - Uploaded with Skitch (external link)

IMAGE: http://img.skitch.com/20120408-kfdpt5jy6j18chakbakintug49.preview.jpg
IMAGE LINK: http://skitch.com/mndo​ci/8txhj/img-8090  (external link) Click for large view (external link) - Uploaded with Skitch (external link)

Can't tell if it's the lens or the filter, or something else.

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tkbslc
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Apr 08, 2012 12:24 |  #2

It's almost never the lens, i'd start with your sensor.


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jvk
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Apr 08, 2012 12:24 |  #3

Have you tried automatic sensor cleaning? Just a button in the menu, helps me sometimes.


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Camera: Canon EOS 7D / Nikon Coolpix A / Hasselblad xpan
Lenses: Canon EF 16-35mm f/2.8L USM / Canon EF 24-105mm f/4L IS USM / Canon EF 80-200 f/2.8L / Canon EF 300mm f/2.8L USM
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mndoci
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Apr 08, 2012 12:51 |  #4

I just did the cleaning, and then took pictures with and without the filter, the spots same to be there (same general picture as the clouds, although slightly less bright today).

The only reason I was hoping it was the lens was it doesn't show up at all when I use the nifty fifty

IMAGE: http://img.skitch.com/20120408-p5xnjq5ai74rhh4ufu8kcjke56.preview.jpg
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cheezz
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Apr 08, 2012 13:10 |  #5

Try a smaller aperture on the nifty fifty.


Canon 7D // EF 24-70mm f2.8L USM, EF 85mm f1.8 USM, 50mm 1.8 II Nifty Fifty, EF 28-135mm f3.5-5.6 IS USM kit lens, EF-S 55-250mm f4-5.6 IS, 430EX II
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mndoci
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Apr 08, 2012 13:27 |  #6

Yep, tried it F/20 and the spots are there on the nifty fifty as well. Sigh. I wonder if it was like that when I bought the camera.


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mike_d
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Apr 08, 2012 13:29 |  #7

Spots on a filter or front element won't be visible since they're so far out of focus. The first picture shows classic sensor dust spots. Sensor dust becomes more visible as you stop the lens down. A Rocket Blower can remove most spots. Beyond that, there are many wet cleaning methods to choose from. You can also just live with it and clone out the spots in the computer.




  
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mndoci
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Apr 08, 2012 13:41 |  #8

Definitely the sensor. I have a feeling something happened when I was switching out lenses on the beach. Will do more Rocket Blowing although I can't seem to get rid of all of them.


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GregoryF
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Apr 08, 2012 13:41 |  #9

Every DSLR will end up with Sensor dust. It is simple enough to clean. Try a rocket blower first and if needed a wet cleaning. I use the Copperhill Method with great results.


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SkipD
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Apr 08, 2012 14:22 |  #10

The spots are definitely on the camera's sensor (actually, they are on the filter that's in front of the sensor) but they may not be dust. Dust can generally be blown out or shaken off by various camera's mechanical sensor cleaning systems. Sometimes, little blobs of lubricant from inside the camera get on the sensor and they generally require "wet cleaning" to remove.


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mndoci
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Apr 08, 2012 15:46 |  #11

*sigh* 2 years of 450D and this never happened. I suppose I change lenses a lot more often now and do a lot more photography. Anyway, looking at various wet cleaning options, cause I've done enough rocket blowing to last a lifetime


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RustyHammer
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Apr 08, 2012 16:11 |  #12

I would recommend having it professionally cleaned. Take the photos/examples with you as illustrations of the issue. It shouldn't cost very much and the peace of mind of putting this problem will be worth whatever it costs you in the end. Just me two cents!


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mndoci
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Apr 08, 2012 16:14 |  #13

The good news is that all the rocket blowing seems to have worked. I haven't looked at the pictures on the computer yet, but the obvious spots don't show up on the Camera LCD.

Edit: looked on my iPad. I just see blue sky now

RustyHammer wrote in post #14231299 (external link)
I would recommend having it professionally cleaned. Take the photos/examples with you as illustrations of the issue. It shouldn't cost very much and the peace of mind of putting this problem will be worth whatever it costs you in the end. Just me two cents!

My wife is definitely in your camp.


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tkbslc
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Apr 08, 2012 16:17 |  #14

Sensor cleaning is not that big of a deal and something every camera needs eventually. No need to fear it.


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mndoci
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Apr 08, 2012 18:29 |  #15

Here's the current state

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Is this dust on the lens or the filter? Or something else?
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