Posting on this forum after almost one year pause
Anyway, I thought I should share this story...
Purchased a brand new K-X in a kit with 18-55 and 50-200 lenses (did not want the 55-300 as I already have AF Tamron 70-300).
So I went with great expectations for the first nature shoot, downloaded the pictures on my computer and in a horror found out few dark specs/spots against clear blue sky. Did some more test shots against a white wall, and sure enough, at least a dozen or more round specs/spots all over the frame, three of them pretty nasty. Run the sensor cleaning, blew the sensor with air - no change.
To be more specific, the spots almost disappeared at aperture 5.6 or less, but at full aperture the spots were very contrasty and almost black.
Using a small led flashlight and 5x magnifying glass, I could see the spots clearly on the sensor. Did quite a bit of research on the web and conclusion was that either some (excess) lubricant right from the factory got splattered on the sensor or it was my own doing with the Hurricane bulb lower, which I did initially as a "preventative measure".
So, again based on web research, I decided to clean the sensor myself using the Photograpics Solutions' Digital Survival Kit #2
Cleaning Digital Cameras - Photographic Solutions, Inc.
The kit includes a free sample of Sensor Swab+, so I started with this one, following their procedure. All what I got were the spots partially removed but mostly smeared on the sensor. Doing a dry swipe after with included PEC-PAD wand did not help either.
So I tried a different way, used the included Eclipse liquid on the Pec-Pad wands and this time I swiped the sensor several times, very thoroughly. Thanks god, the smears were almost gone, but had to do some additional dry Pec-Pad, then wet Pec-Pad and dry again before all the blemishes were gone.
So what I learned. Even that I cannot tell for sure that the Hurricane was the culprit, it goes to garbage can. The wet cleaning with a Pec-Pad wand moistened with the Eclipse and followed by the dry Pec-Pad cleaning worked best for me.