Use By: We’re all used to our perishable food coming with an expiry date. They take various forms such as: Sell by mm/dd/yyyy or Best if used by mm/dd/yyyy. And sometimes, they don’t say much of anything. There’s just a date and maybe some undecipherable lot code. It’s up to us to guess if the date is the expiration date. …
Optical Filters The optical filters with which I am most familiar are those that photographers use to enhance their images and videos. These particular filters screw into or clip onto the camera lens. I’m not going to bore you with examples of how the filters are used. Suffice it to say that filters modify the images recorded. Sometimes they are …