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If you can see it at f/3.5, yeah - I think you're way overdue for a cleaning. Are you sure it's not on the lens?I see the dust on clear blue sky at maximum aperture: F3.5
I think this is serious, I need a cleaning. What is your opinion ?
Big Mike:
E2 is a new cleaning fluid, especially for sensors that have tin oxide in the coating. I'm not sure if the D40 is one of those or not.
Yes, you should use the E2 fluid.Well, I need eclipse E2, right ?
Read the manualWhat exactly I need to do ?
The Arctic Butterfly is a pretty safe product....but may have trouble with stuck on particles.
With a bit of care and common sense...most sensor cleaning products are fairly safe.