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NoFlashPhotography Aug 7, 2011 3:11 AM

Black specs in photos
 
1 Attachment(s)
Okay, so I was on vacation for 7 days and was using the 18-55 for most of the trip. On the 4th day in Nelson, BC I decided to take out the 70-300 and shoot some photos of the "big orange bridge" I got home today and while I was going through the photos on my computer, I noticed black specs on the orange bridge photos. I was curious to see if it was the lens so I looked at all my other 70-300 photos taken after that day. They all have the black specs. I took out my lens just now and cleaned the front and also the filter. It seemed to have worked but I can still see a few dim specs.

What I am wondering is, is it my d100 or the lens? I need help!

EDIT: I forgot to mention, I am leaning more towards the fact that it is dirt or dust in the sensor but I'm still not 100% :|

corkpix Aug 7, 2011 3:44 AM

Looks like a bit of dust on the sensor. Check with another lens just to make sure.
Your shot was taken at a very small aperture. Even with a fairly clean sensor, you
are likely to see a few spots at f/32.

Bob Nichol Aug 7, 2011 6:31 AM

Take a picture of the clear blue sky at f22 using any lens. Use the autolevels in Photoshop on the picture and see whether you can find any kind of 'blobs' in your picture?

With the lens off use the Sensor Clean option to open the mirror and shutter and try using a blower to dislodge the dust. DON'T BLOW WITH YOUR MOUTH!!!

If that doesn't work the next step is using a dry brush. I have an Arctic Butterfly that works well. http://visibledust.com/

Worst case is to have to use a wet swab at which point I would get it cleaned professionally.

VTphotog Aug 7, 2011 12:42 PM

In my experience, even at f/32, dust and dirt on the sensor tends to be a blurry blob, rather than have the sharply defined edges shown on this photo, so I would guess there is debris on the lens internal surface. If it does show up after cleaning the lens, or with another lens, I would suspect paint or metal flakes. Does the D100 have a sensor cleaning mode you can try? If not, Bob Nichol's suggestions are good.

brian

NoFlashPhotography Aug 7, 2011 1:24 PM

Thanks for all the feedback. I realized that in other photos that day with the 70-300 using f8 the blobs were much smaller! I completely forgot I used f32 for these photos. They were taken 4 days ago. I still think it's dust so I'll try the blower thing.

dr_spock Aug 7, 2011 8:30 PM

A blower and test shots, see if the spots are gone or moved elsewhere.

http://i98.photobucket.com/albums/l2...icture6443.jpg

NoFlashPhotography Aug 11, 2011 3:38 PM

Quote:

Originally Posted by dr_spock (Post 1247168)
A blower and test shots, see if the spots are gone or moved elsewhere.

http://i98.photobucket.com/albums/l2...icture6443.jpg

I had some sort of air blower that I used but it didn't do anything. Ughh, might have to buy one of these.


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