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05-01-2011, 06:39 PM   #1
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Spot in photos using 300MM zooms

The attached photo of a hawk was taken with a s Sigma 75-300mm. You can see a spot near the top quarter of the frame, as well as two small ones in the lower portion. I had similar spots when using a Pentax 100-300mm and thought it was the Pentax lens, but now I see it with the Sigma as well WHEN set at 300mm or somewhere in that range. Photo was taken with a K-10.

Can someone tell me the cause of this>

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05-01-2011, 06:44 PM   #2
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Dust on your sensor.
05-01-2011, 07:01 PM   #3
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At least 5 spots. A Giotto rocket blower is essential.
05-01-2011, 07:16 PM   #4
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It's dirt on the sensor..

https://www.pentaxforums.com/forums/pentax-dslr-camera-articles/121739-those-...ml#post1259109

Your lens would have to be VERY cruddy for it to show up in a photo.



05-01-2011, 11:25 PM   #5
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Blower is what you need. but DO NOT touch the sensor with a cloth etc. Scratches, which will be very tiny on the sensor would show up as huge on a photo. Can ruin your camera.
05-02-2011, 04:42 AM   #6
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I have found with my K10D that simply blowing isn't always enough to remove the dust. The K10D seems to be worse than other models in this regard.
Step one is always as others have said, simply blowing out the box, then opening the mirror and blowing out the sensor area (with the camera pointed down.
Then take a picture of a clear evenly lit empty sky using a small aperture and inspect the resulting picture for spots.
Step two (I need to do this about 3/4 of the time when I clean) is to dab clean the sensor using something like the "Pentax Lollipop" (mine is sold by Dot Line Corp and appears identical).
Then take a test picture again.
If needed (I haven't yet) the third step is a wet cleaning or professional cleaning.

In any and all cases, be very careful not to scratch the sensor's filter.
05-02-2011, 01:27 PM   #7
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It isn't the lens...
05-02-2011, 03:28 PM   #8
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QuoteOriginally posted by mobygrape Quote
It isn't the lens...
Nope.

05-02-2011, 05:50 PM   #9
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Thanks
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