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Matt Blaze

@mattblaze@federate.social View on federate.social

Scientist, safecracker, etc. McDevitt Professor of Computer Science and Law at Georgetown. Formerly UPenn, Bell Labs. So-called expert on election security and stuff. twitter.com/mattblaze on the Twitter. Slow photographer. Radio nerd. Blogs occasionally at mattblaze.org/blog . I probably won't see your DM; use something else. He/Him. Uses this wrong.

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  • 125 posts

Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

@mcr314 Perhaps I'm referencing some recent incident or event.

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Matt Blaze @mattblaze@federate.social

I can't get out of my head the fact that there may be an alternate universe where after Trump tried and failed to overturn the 2020 election, he was forced to flee to Brazil to evade prosecution.

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Matt Blaze @mattblaze@federate.social

Question for federal criminal law talking people: The latest Comey information charges him with violating 18 USC § 793(d), a broad statute covering mishandling national defense information. Everyone (including Comey's lawyers) seems to believe the statute of limitations here is 10 years. But I can find no exception to the default five year rule for 793. What am I missing?

storage.courtlistener.com/reca

(There's a similar offense in 50 USC § 783 with a 10 year limit, but that wasn't charged here).

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Matt Blaze @mattblaze@federate.social

Just got a lengthy rant from someone about what a terrible person I am, responding to a post of mine from a YEAR ago in which I mentioned that I used a rideshare service to get to a medical appointment.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Captured with a small full frame mirrorless camera and 21mm lens.

A six second exposure created a motion study; we can see how people move around the plaza. Or perhaps they're ghosts.

Compositionally, this is mostly a study of circles and rings, with an imaginary diagonal radiating from the fountain to the man with the camera in the lower right.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Bethesda Fountain, Central Park, NYC, 2013

All the pixels, closed at dusk, at flickr.com/photos/mattblaze/10

#photography

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Matt Blaze @mattblaze@federate.social

I was going to vote for the democrat, but then I found out that Obama disrespected the decor at Cheesecake Factory.

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Matt Blaze @mattblaze@federate.social

Bethesda Fountain, Central Park, NYC, 2013

All the pixels, closed at dusk, at flickr.com/photos/mattblaze/10

#photography

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Captured with a small mirrorless camera and 21mm lens late on a winter night.

The "Steak and Bagel Train" has served intermittently as a neighborhood breakfast and lunch joint. It had been abandoned and neglected for a number of years, but was renovated and re-opened in 2010. Sadly, it closed again a couple years later. I believe "Since 1907" was entirely fanciful.

The structure was originally a Reading Railroad dining car. It sits on an abandoned siding near Broad Street in Philadelphia.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Steak and Bagel Train, Philadelphia, PA, 2011

All the pixels, but honestly the cheesesteaks aren't actually very good, at flickr.com/photos/mattblaze/54

#photography

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Matt Blaze @mattblaze@federate.social

Steak and Bagel Train, Philadelphia, PA, 2011

All the pixels, but honestly the cheesesteaks aren't actually very good, at flickr.com/photos/mattblaze/54

#photography

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Leica 35mm/1.4 Summilux ASPH lens (@ f/5.6), Leica M9 camera (@ ISO 160).

This humble old urban church had been abandoned for some time when this photo was captured. The roof had already collapsed. It was completely demolished a few years later.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Former Bethel Tabernacle Church, Callowhill St, Philadelphia, 2011

All the pixels, but no collection plate passed around, at flickr.com/photos/mattblaze/55

#photography

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Matt Blaze @mattblaze@federate.social

Former Bethel Tabernacle Church, Callowhill St, Philadelphia, 2011

All the pixels, but no collection plate passed around, at flickr.com/photos/mattblaze/55

#photography

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Also, fun fact, while zoom lenses today are very commonly used as a convenient alternative to multiple lenses in still photography, they were mostly developed for cinema, where "zooming" during a shot is an effect that can't be achieved without the ability to vary the focal length on the fly.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

And none of this has anything to do with whether a lens is a "zoom", which refers to lenses with a focal length that can be varied across a range to achieve different angles of view without changing lenses. Many people casually use "zoom", "telephoto", and "long" interchangeably (usually when they just mean "long"), but that just confuses people who understand the technical meaning of those terms.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

A quick and very pedantic note on long lens nomenclature:

Lenses with a narrow field of view and a long focal length (> ~90mm or so on 35mm cameras) are called, appropriately enough, "long" lenses.

Many, but not all, long lenses employ an optical design where their physical length is shorter than their optical focal length. These are called "telephoto" lenses. Most, but not all, telephoto lenses are long, and most, but not all, long lenses are telephoto. But the terms aren't interchangeable.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

One of the challenges of very long lenses is that they tempt you to compose images of subjects that are very far away. But the farther away something is, the more the atmosphere can distort the image. The effects of heat distortion, pollution, humidity, and weather are amplified across longer distances, no matter how sharp the lens is or how high resolution the sensor.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

Very long lenses like the 400mm (and up), with their narrow field of view, are essential for some compositions (such as this one), but I find I only rarely actually use them. In fact, the longest lens I have for my main medium format camera system is 180mm (which yields the 35mm equivalent view of about a 120mm), and I hardly ever use even that for the most of the photography I do.

For wildlife photographers, on the other hand, 400mm is practically a wide angle.

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Matt Blaze boosted

Matt Blaze @mattblaze@federate.social

This was captured with a DSLR and a 400mm/2.8 lens, which contributed to the compressed composition. The conductor boarding the leftmost train is essential to the composition, I think.

Ewing, NJ ("West Trenton") is the last stop on SEPTA's commuter trains from Philadelphia on the former Reading Railroad's line to northern NJ. CSX freight trains still use the tracks north of the station, beyond the end of the overhead electrified wiring used for passenger service.

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