Hacker News Reader

> And good plastics are plastic in the traditional sense of the word: if you drop them, they'll absorb the force by deforming and then spring back into place.

That's not what I was taught plastic meant. I was taught both plastic and elastic materials deform under force, but the elastic ones (not the plastic ones) return to their original form once the force is gone …

If you drop an iPhone hard enough it wil dent. Drop a polycarbonate phone: no problem. Windows phone wasn't a great OS, but the Lumia line were absolute tanks.

PC is a very impact resistant material, but you can also form it cold, a bit like mild steel, actually.

So is nylon. But nylon is hydroscopic, and thus not well suited for electronics applications.

I do prefer ABS-PC or ASA for a lot of my more-adverse condition cases. They're much more heat resilient, and chemical/UV resistant in ASA's case.

Well, a great many connectors (even, or rather, especially industrial ones) are made from PA6 or 66 with some glass fiber fill; including the actual contact carriers (if they are a separate part). FR4 is somewhat hygroscopic as well; moisture expansion causes real problems for some applications. Never heard of issues with PA connectors.

"Plastic" actually stands for "thermoplastic", meaning they can be easily deformed when hot. At normal temperatures, a thermoplastic material can be pretty elastic.

In mechanical engineering, plastic deformation does refer to permanent/non-reversible changes (as opposed to elastic deformation) past the elastic limit. That said, plasticity is more commonly used to suggest malleability.

A heavier camera can be steadier to hold, just by sheer mass. Micro shakes in muscles can make a light camera body move more.

Plus a heavier body can better balance a heavy telephoto lens.

Elastic deformation is reversible with a release of the driving force, plastic deformation isn't.

Typical metals will have an elastic zone, where they act like springs, and a plastic zone, where they don't, and then they fracture. Brittle materials have a relatively small plastic zone, ductile materials will have a large one.

That's true an over years read many people that dropped their canon rebel and they were surprised it didn't shatter into a million pieces and often still worked as good as before. Some brought it to service centers just to be sure.

I never dropped my camera though, but i do run into things a lot, doors, doorposts, fences and most of all tiny people.

Though with a bit typical lens 70-200 or some people often bring, i doubt the difference in weight of the body plastic vs metal is really noticeable. (plastic rebel XTi 556 grams vs 668 grams metal nikon d80)

>I never dropped my camera though, but i do run into things a lot, doors, doorposts, fences and most of all tiny people.

Huh?

I'm not the most careful person with my camera gear. All my bodies and lenses have taken some blows here and there from, as i said, doorways, people, brick wall corners etc, flew through the car once, i just never let it slid from my hands on the ground or something.

Typical i have a shoulder or wrist strap, ads (no im not affiliated) peakdesigns' or blackrapids' straps and wrist bands

If any reading this still use the neckband with their cams, checkout black rapids systems or peak designs. It's so much more comfortable then 2+ kg dangling from your neck.

Mostly referring to the "tiny people".

Kids

Oh sorry, i meant kids indeed, they are about head height of where i carry my camera, waist height. (im 2m tall)

> Given that you're often hand holding a camera, being lighter is a significant advantage, it can often be the difference between a stable or a blurred shot.

Lighter camera ~ more vibrations.

Not when you hold it in you hands, which is the clearly stated premise.

No. Hand-held a heavier camera gives you less shake, unless it is too heavy to hold continuously without quivering.