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Spots


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2 replies to this topic

#1
sunshine

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I'm seeing spots.  They look like dust or worse on the sensor.  However, I noticed that they appear much more pronounced and visible the lower my shutter speed.  In the photos below, the first was taken at 1/25" and the second one at 1/400".  If I zoom to 1:1 on my 29" monitor I can still see faint spots on the second image in the upper left corner but they don't look anything like the spots that are all over the first photo.

 

Anyone seen this before?  Do I just need to clean my sensor again?  What could cause these spots to be more or less visible depending on shutter speed?

 

500 8941
 
500 9151

 



#2
Merco_61

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Yes, you should clean your sensor.

 

Dust and pollen on the sensor will always be more visible the more you close the aperture down. It is not surprising that many of them that are visible @f/32 have more or less disappeared @f/13.

 

This time of the year, I usually have to bring out the rocketblower at least twice per week to clean the sensors as the sensor shaker just isn't enough. The interval between wet cleans is usually 4-5 months for me.


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#3
sunshine

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Thanks. I didn't think about pollen. It's been heavy here this spring. Time for a wet clean.