Here and there I read of people who set their lens to a small aperture while testing their sensor cleanness, supposedly to get the best image of dust speckles. However, the image of the on-sensor dust particles should not, to my understanding, be affected by the sharpness induced by the lens settings. Same is true for dust particle on the lens elements themselves. It makes me wonder - do these people misunderstand the theory of how the optical system work, or am I missing something?


Question: Outlook doesn't download all emails, whereas iphone does
Answer: It could be that your iPhone is deleting the messages off the server before your Outlook client downloads them. Check for a setting related to this. It might be called something like "Leave a copy on the server" or "Delete messages from server after downloading."