https://mastodon.social/@AstroHyde/113499580274522138 AstroHyde@mastodon.social - Air filter cleaning day at the observatory! I highly recommend CR boxes (see https://cleanaircrew.org/box-fan-filters/), I made several and even the easy filter+fan are so good. Clean air circulation helps seeing, mirror longevity, and humans. Of course if you have actual scope filters don't forget those too 🙂

For comparison, the expensive PW1000 filter covers vs a super simple CR over at the Allan I Carswell Observatory #yorkuniversity #Astrodon #astronomy #observatory #cleanair #corsirosenthalbox #airquality