Recent content by collinsmark

Back to the Nebraska bird pics (round #2). Figure 11. A couple of common grackles (Quiscalus quiscula). Here you can see their colors a little better. Grackles usually appear pretty much black and can easily be confused with blackbirds and crows. But in the right light you can see the...

[2/2] One more post of pics from the vigil. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Okay, that's all I'll post of this vigil event here. I'll get back to the Nebraska pics and some downtown San Diego pics...

( [1/2] This post of photos is jumping order due to its nature as a current event. I want to post these first, even if they are not in chronological order with my previous and upcoming posts. I'll post more Nebraska and downtown San Diego pics later.) I walked to a vigil Tuesday to show support...

I won't rate them on a scale, but I will repeat what I've said before: I like them. (I've seen some of these photos from a previous post, several years ago [and I remember commenting on them at the time]. Some of the photos are good enough that I still remember them.) There's definitely some...

Nebraska bird/critter pics round 1. Taken a few weeks ago on a trip to eastern Nebraska. Figure 1. Mourning dove (Zenaida macroura) Figure 2. American robin (Turdus migratorius). Figure 3. Eastern cottontail (Sylvilagus floridanus). Figure 4. American robin (Turdus migratorius)...

Cherry blossoms are cool, but I think this image might be AI generated.

(Came in on other social media feed. Not mine originally.) New formula for \pi : \pi = \prod_{\pi = \pi}^\pi \pi

I get a lot of chess puzzles coming in on my social media feed. Most are of the form, "Black to move. Mate in 2!" which I read in my head, Black to move, mate in 2 factorial, ...which is also 2.

'Took a flight back to flight to midwest (US) last week. 'Passed over (or at least near) the eastern part of the Grand Canyon. Here are a few pics. After the fact, I had to spend a lot of time on Google Maps trying to figure out what I was looking at. I figured it out. Details in the captions...

Here's my batch of pics for this week. Starting out at the weekly thing I've been going to. Figure 1. <Untitled> Figure 2. <Untitled> Figure 3. <Untitled> OMG, this puppy. -- 'Nailed focus on this one. Though of course this image was within a group of 3 or 4 out-of-focus images in the...

No Balboa Park pics this week, but I did take the trolley downtown for my weekly thing there. Here are a few select pics. Figure 1. "Trolley reflection study #6" I wasn't the only one with a camera there that day (See figs. 2,3). It's always good to see other photographers. Always carry a...

... Continued from last post. I was shooting wide open at f/1.4 with the 50mm Summilux-M ASPH for these shots. She [the puppy] was moving around a lot making it especially difficult to achieve focus (manual focus). I'm pleased with myself for getting the shots that I did. Figure 9. <Untitled>...

This week's batch of photos. From last Wednesday's Balboa Park trip: Figure 1. <Untitled> I think the people in the photo were gathered for a formal occasion. A wedding probably. Figure 2. <Untitled> The natural light was remarkable for portrait shots at this moment. Figure 3. "Apartment...

I think it could have gone both ways. Interference (destructive interference in this case) is a big thing in physics (interferometry, beam forming, double slit experiment, just to name a few). @kuruman is doing a ~1 per day lame joke from an old (11 year old) list of physics jokes he dug up.

A couple from a Balboa Park visit about a week ago. Figure 1. <Untitled> A couple of cuties enjoying Balboa Park. Figure 2. <Untitled> A shot from one of my more frequented bus/trolley stations. I like the tones. It's good for B&W pics.