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In the dream,

we work the byways and flyways of pacific salmon

and monarch butterflies.

Days flow like cycling migration patterns of hummingbirds and

humpback whales.

— nourished by seal pup carrion and wildflowers.

Lew is right. There is no place else to go,

but remember that rascal Chuang Tzu. He says,

“Maybe my life is only a butterfly’s dream.”

-Nathan, May 9, 2013

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Here’s the sunset at 8:04pm from Thursday’s ride in the Marin Headlands.

The light was tricky. It was well into twilight, and there was a sharp contrast between the lightest and darkest areas in the scene.

(Note: roll your mouse over the image to see the extreme difference in the unprocessed camera file.)

For a landscape scene like this a serious photographer would typically use a large-sensor DSLR camera plus:

• a tripod (to allow for a long exposure to let in more light without introducing blur from inadvertent camera movements) and
• a graduated neutral-density filter (to control the scene’s dynamic range by reducing the brightness of the sky — but not the foreground).

However, my little Sony RX100 (reviewed here by NY Times tech writer David Pogue) handled the scene fairly well.

Here is the processing technique I recommend for this — or really any — digital photograph:

1. Choose an exposure that preserves the brightest areas in the scene. That is, “expose for the highlights” to retain the vivid color and detail which might otherwise get “blown out”.  Metering the scene like this will render the rest of the image too dark, but that’s okay. When mousing over the above image, you can see how everything — except the sky, the bike’s shiny metal parts, and the clear water bottle — is way (and I mean way) underexposed.
2. Tweak the shadow areas in post-processing according to taste.  Here is where we adjust areas that are too dark. When I opened-up the shadow areas in Photoshop using a curves adjustment layer there was surprisingly still enough detail hidden in the file to create a decent image (at least for viewing on the web). In most images the before/after differences will be less extreme, but the technique will be the same.

By the way, this is the exact opposite of what Ansel Adams did in his black and white film photography. He would “expose for the shadows“, that is, meter the darkest area of the scene to preserve wanted detail, then in the darkroom develop the highlights to taste.

The difference in technique is a function of how digital sensors and film emulsions handle highlight rendering. For a good discussion of Adams’ technique and his Zone System, see this article.

-Nathan

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April-May and Sept-Oct can always be counted on for balmy weather in the Bay Area. Today, it was 80+ degrees in downtown San Francisco!

The wind was gusting a bit in Sausalito when I arrived home from work, but around 7pm the wind just stopped.

Even at this hour the air was still warm. So I couldn’t resist a short climb up to the Golden Gate Bridge and then further up into the Marin Headlands to watch the sunset.

Even on the long descent coming home (as it was getting dark) I was completely comfortable in just a short-sleeve, cotton t-shirt.

These pictures were made at 7:53pm.

It’s not fair to extrapolate anything from a single picture, but it’s kind of funny that the guy is checking his phone, while the girl is totally digging the moment.

I’m not casting judgement because I’ve been that dude — maybe we all have.

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My Honda Fit needed some repairs (valve adjustment, transmission fluid and oil change, tire rotation, driver side mirror wiring harness, and visor clip) so I had to figure out how to get to and from the dealership twice this past week.

I decided the most efficient solution was to drive to the Honda shop after work and bring my bicycle along. Then I could drop off my car and use the bike as transportation to get back home. When my car was ready for pick-up later in the week, I would repeat this in reverse, i.e., ride my bike back to the dealership, then drive the car and bicycle back home together.

Since I would be making essentially the same trip by both car and bike several times I jotted down some numbers:

• by car it was a 9.1 mile one-way trip (mostly on highway 101) and took me all of 13 minutes.
• by bicycle it was a 10.6 mile one-way trip (mostly on bike paths and back roads) and took me 46 minutes.

Adjusting for the mileage difference, the bike ride was almost exactly three times less efficient in getting me from point A to point B. But it’s probably more accurate to just say the bicycle was three times more time consuming.

Examining the bike’s efficiency (in isolation) is problematic. One can argue that all the time and energy spent riding the bike should count against the car. If one expands the boundary conditions of this hypothetical efficiency equation, you realize my bicycle riding was only necessary because of the needed automotive repairs!

However, in the process of bicycling this route twice in one week, I enjoyed myself quite a bit, got some needed post-work exercise, and became more acquainted with Marin bike paths and the new bicycle and pedestrian tunnel that opened last year, connecting Larkspur and San Rafael.

So what now? Do I register this joy and satisfaction on the bike’s or the automobile’s side of the ledger?

Now I’m really confused.

Anyhow, the picture above is in Mill Valley. Gotta love the classic VW bus.

This quote from the film (starting at 1:01 on the video clip below) addresses a frequent stereotype aimed at those who enjoy this pastime.

“There’s really no way to look cool. You’ve got your binoculars up. You’re looking at something that nobody else is looking at. And everyone else is looking at you and thinking, you know, ‘what a dweeb’.”

The Big Year. It got poor reviews, but I really loved it. (I hear most real birders hated it).