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Saturday, 08 May 2021


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Well, highly off-topic, but speaking of dandelions, there's an interesting article I came across recently about some newly discovered aerodynamic properties of dandelion seeds. It's a quick, non-technical read. https://bgr.com/science/dandelion-seeds-wind-physics-5924018/

Moire much?

Dandelions are repeat flowering in U.K. if you mow them in your lawn, as most do. The leaves are edible in salad and used to be blanched in the dark like endive, whether this reduces their diuretic effect I don’t know but that folk used to eat them is evidenced by their common names in several European languages — pis-en-lit etc ;).

Thank you, Jeff, your comment made me LOL. I needed that!

Well, if you're going to pass off the 200% image as a fine art print, I guess you'll have some trouble.

Otherwise, now that you're aware of that problem, don't worry about it.

The thing that bugs me is the purple fringing. I never had that problem with film.

Speaking of which, I took some test shots with my 77mm Limited of tree leaves against the bright clouds and it seems as though the recent firmware update has greatly reduced the purple fringing of that lens. More testing to do, but I was pleasantly surprised.

Zoom in to 500% and I bet you see aliens...

You have a dandelion "problem" only if you insist on having a totally unnatural, environmentally insane, monoculture grass lawn. Otherwise, you can just think of the dandelions as beautiful, albeit short-lived, free flowers.

The interference in the zoomed section could be from raw file compression. I don't know what the raw file save options are for the A6600.

Forget the moire, that picture of your shed is lovely. Your walkabout snaps are always enjoyable to look at.

Too bad the dandelions are not in North Korea. They have a major shortage - because they are edible. A starving population eats them so fast they don't have a chance to become a nuisance.

[I've been eating them too! From a planter on the porch. The greens are very healthy. Glad I don't need greens for sustenance, though. --Mike]

That test shot self portrait shows a much leaner and healthier looking person .Well done Sir!

Last year we had a lot of dandelions and this year looked like a repeat so I spent €50 on dandelion weed killer before I gave up.

There are a great many old recipes for dandelions, assuming they are the same variety as the UK.

Looks like you've been smoking something in that shed Mike.

[Nope. Drug- and alcohol-free since 1990. I still think it must be aliens. --Mike]

People want grass lawns for two reasons. One: it makes them feel like rich Victorian estate owners; but those owners had a permanent staff of gardeners, do you? Two: Grass is soft to walk on in bare feet, dandelions greens are not.

Solution: Get rid of the damn grass and plant clover. Soft to walk on, doesn't grow as tall so less maintenance, and because of the broad leaves it does a better job of weed prevention.

You know why lawns are difficult to maintain in good condition? Nature hates lawns. Why do we think we can beat nature?

A dandelion-free lawn is a sign of nasty chemicals and the lawn itself is a bizarre Veblen syndrome. A lawn is a pasture that one can afford to waste, by keeping sheep off it, and using humans to mow it. I wonder how many people would prize lawns if they realized that they're just taking the place of sheep?

I like seeing fields of goldenrod in the fall, both from the ground, and from a small plane.

Spring has sprung, and that always beings out the Lawn Hippies who espouse the virtues of dandelion: color! Food for the insects! Death to the HOAs! It's a militant reaction to the Lawn Nazis who spray poisons to compel green uniformity from curb to shining curb.

Seeking some middle ground in this most pressing issue of the week, I've made a compromise. Dandelions are welcome in my lawn as long as they're a sunny yellow, but when the white seed tops develop, I bring out the mower. After cutting and bagging them, they go into the compost pile. In May, I have to do this several times per week. After that, the blooms subside until next year.

The problem with dandelions that the Lawn Hippies ignore is that they die back to the roots after frost. That leaves the ground uncovered and muddy for half a year, if I let them follow their naturally aggressive habit of spreading and displacing the grass.

As for moire, if it's a problem, just use the "AA Simulator" feature in your your Pentax camera. You all do have a Pentax, right?

All together on the chorus:

Dandelion don't tell no lies
Dandelion will make you wise
Tell me if she laughs or cries
Blow away dandelion

(Courtesy of the Glimmer Twins, with Lennon and McCartney on backing vocals)

Here’s simple recipe from Italy for a tasty salad: dandelion leaves (small are better), cherry tomatoes, some finely chopped fresh garlic, fresh mint leaves, extra-virgin olive oil, balsamic vinegar, salt and pepper to taste!

An imaging system is, ideally, matched to the scene to be imaged and desired output. The problem here is, of course, that Bayer sensors are not well suited to imaging fine, regular structures like your shed vent. A Foveon or pixel shift sensor would work better. The antialias filter required to prevent moire (aliasing artifacts) for these structures with a Bayer sensor is quite strong and not needed or even desirable for most images. But the real problem is that such a strong antialias filter interferes with DXOmark resolution figures and pixel peeping, inhibiting camera sales.

(sing) "When a grid's misaligned, with a grid close behind, that's-a Moire"

Sometimes it seems like moiré is digital's equivalent of rainbows. Maybe not as grand as rainbows in the sky, but the more mundane kind you see around lawn sprinklers. Or are rainbows nature's moiré?

They are different phenomena, of course, but similarly rooted in the fact that white light is comprised of colors, with one being an artifact of a particular way we reverse-engineered this natural property so that we could record and reproduce it.

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