Jonathan Scott's latest activity

"Columbium" surprised me but on checking I found that's a pre-1950 name for Niobium.

... Continued from previous post (this post is part 2 of 2). Figure 7. "Broken bulb." 50mm Summilux-M ASPH @f/6.8 Figure 8...

November 2025 Balboa Park pics (Part 1 of 2) After running an errand in Balboa Park late Saturday afternoon, I decided to do some...

TIL that certain marine animals "steal" chloroplasts from marine plants, after which they can live on sunlight for a pretty long time...

I just saw that physicist Kenneth Nordtvedt died on October 9th, according to his Wikipedia entry...

In the late 1980s, working for a university, I wrote some terminal graphics routines for the IBM PC which among other things drew arcs...

My primary concern is that PF users should try to comply with any license conditions, so 1 is much less important and 2 is not a valid...

The terms of use for the XKCD website mean you should provide a link or give credit. That's XKCD 2848, "Breaker Box", https://xkcd.com/2848/

The triple-decker bus is the "Knight Bus" from the Harry Potter movies; there is one which can be viewed at the Warner Bros Studio Harry...

Testing out a new lens. The Leica Noctilux-M 50mm f/0.95 ASPH. I call it the holy hand grenade. It's big, heavy, and unwieldy compared...