4 ms·

The most curious part to me is that all these photos of the helicopters were taken by cameras without rolling shutters.

by donatj 6y ago

daysigh 6y ago
I see we have a man of culture here.
- mdoms 6y ago
  This isn't reddit. Keep these comments to yourself.
  - donatj 6y ago
    This is the persons very first comment. Assuming good faith on their part, and that they are new to HN, there's no need to be rude. We want to foster a friendly community here.
    - uoaei 6y ago
      That wasn't rude. It was direct.
      - mwambua 6y ago
        I found it rude and indirect. It would have been nice of them to point out why the comment is unhelpful, rather than just saying "This isn't reddit"
        texasbigdata 6y ago
        The best part though, is not the initial response or the counter, it’s the fact the “commons” is so valued you have this sort of meta self-regulation taking place to rebalance to equilibrium. Super cool and wish, well basically everything else in life was like that.
    - blululu 6y ago
      Meta-comment: that is nice of you to check the OP’s submission history. It does add context and the response, while valid was maybe a little harsh in light of the poster’s newness. It might be nice if there were an easy way to tell if a poster is new (or a throwaway) for such context.
      - 1f60c 6y ago
        The usernames of new users are colored green for the first two weeks (or so) after they've signed up.
deleted 6y ago
[deleted]
ISL 6y ago
Having serendipitously dipped a toe into the avgeek waters, it doesn't seem so surprising to me. In a major metropolitan area, you can bank on people listening to ATC traffic and camping out near airfields with good-enough cameras at almost any time. In the avgeek world, one can earn both personal satisfaction and kudos for novel aircraft, so they are especially desirable. Even a beginner is likely to have an imaging system that is plenty good, with a mechanical shutter. The atmospheric shimmer in the third image suggests that it was made with a longer lens; probably not a beginner. The President of the United States can't fly over Britain on a secret trip without getting photographed by a semi-retired IT manager: https://www.theguardian.com/uk-news/2018/dec/27/air-force-one-spotted-in-sheffield-how-uk-enthusiast-revealed-trumps-iraq-trip https://www.theguardian.com/uk-news/2018/dec/27/air-force-on... It is really great to see distributed citizen-journalism happening.
- CobsterLock 6y ago
  It is super cool that there is a community around this
- wkearney99 6y ago
  I read that as "disturbed citizen-journalism" and, honestly, it'd still work.
spaetzleesser 6y ago
Probably taken with cameras with mechanical shutters? That doesn’t seem very curious.
sudosysgen 6y ago
Most cameras that can take good images of helicopters in flight have a mechanical shutter available.
- KaiserPro 6y ago
  Thats only there to protect the sensor. There will be an electronic shutter too.
  - sudosysgen 6y ago
    Not really. Most interchangeable lens cameras do not have a purely electronic shutter, it's a very new feature. Those that do, do not have it as the default mode. There is also the electronic first curtain shutter, but that is way closer to a mechanical shutter than to an electronic shutter.
- PointyFluff 6y ago
  Such as? Citation needed.
  - sudosysgen 6y ago
    Pretty much every single camera that has interchangeable lenses, and thus can mount a telephoto objective sufficient for taking good pictures of helicopters has a mechanical shutter. From the Sony alpha series, to Nikon DSLRs, to the Canon EOS line, and so on.
KaiserPro 6y ago
I don't think we can draw that conclusion. Its the middle of the day with no cloud, so there is plenty of light. That means we can up the shutter speed to the point where rolling shutter is negligible. I have a nikon d7000, which has a rolling shutter. Its only really noticeable when I'm recording video, or when there is _lots_ of movement inside the shutter time. at 1/3200th of second, thats a lot of movement.
- sudosysgen 6y ago
  While that's true, a smartphone even at 1/3200th will have a 30th of a second or so of rolling shutter.
- Sharlin 6y ago
  The D7000, like all system cameras, has a mechanical shutter it uses when taking photos. Even though technically ”rolling” as well, it is much faster than a typical electronic shutter due to the way a CMOS sensor must be read out. Phone cameras have no physical shutters and use e-shutter all the time, but your D7000 only resorts to it when shooting video. As a rule of thumb, it takes several milliseconds for a mechanical shutter to traverse the sensor plane, but it takes several tens of milliseconds for an e-shutter to readout the sensor. Shutter speed does not affect this; even at 1/4000s or 1/8000s or whatever the time difference between the top and the bottom of a photo remains the same.

The most curious part to me is that all these photos of the helicopters were taken by cameras without rolling shutters.

by donatj 6y ago

The most curious part to me is that all these photos of the helicopters were taken by cameras without rolling shutters.

daysigh 6y ago

I see we have a man of culture here.

mdoms 6y ago
This isn't reddit. Keep these comments to yourself.
- donatj 6y ago
  This is the persons very first comment. Assuming good faith on their part, and that they are new to HN, there's no need to be rude. We want to foster a friendly community here.
  - uoaei 6y ago
    That wasn't rude. It was direct.
    - mwambua 6y ago
      I found it rude and indirect. It would have been nice of them to point out why the comment is unhelpful, rather than just saying "This isn't reddit"
      - texasbigdata 6y ago
        The best part though, is not the initial response or the counter, it’s the fact the “commons” is so valued you have this sort of meta self-regulation taking place to rebalance to equilibrium. Super cool and wish, well basically everything else in life was like that.
  - blululu 6y ago
    Meta-comment: that is nice of you to check the OP’s submission history. It does add context and the response, while valid was maybe a little harsh in light of the poster’s newness. It might be nice if there were an easy way to tell if a poster is new (or a throwaway) for such context.
    - 1f60c 6y ago
      The usernames of new users are colored green for the first two weeks (or so) after they've signed up.

deleted 6y ago

[deleted]

ISL 6y ago

Having serendipitously dipped a toe into the avgeek waters, it doesn't seem so surprising to me. In a major metropolitan area, you can bank on people listening to ATC traffic and camping out near airfields with good-enough cameras at almost any time. In the avgeek world, one can earn both personal satisfaction and kudos for novel aircraft, so they are especially desirable. Even a beginner is likely to have an imaging system that is plenty good, with a mechanical shutter. The atmospheric shimmer in the third image suggests that it was made with a longer lens; probably not a beginner. The President of the United States can't fly over Britain on a secret trip without getting photographed by a semi-retired IT manager: https://www.theguardian.com/uk-news/2018/dec/27/air-force-one-spotted-in-sheffield-how-uk-enthusiast-revealed-trumps-iraq-trip https://www.theguardian.com/uk-news/2018/dec/27/air-force-on... It is really great to see distributed citizen-journalism happening.

CobsterLock 6y ago
It is super cool that there is a community around this
wkearney99 6y ago
I read that as "disturbed citizen-journalism" and, honestly, it'd still work.

spaetzleesser 6y ago

Probably taken with cameras with mechanical shutters? That doesn’t seem very curious.

sudosysgen 6y ago

Most cameras that can take good images of helicopters in flight have a mechanical shutter available.

KaiserPro 6y ago
Thats only there to protect the sensor. There will be an electronic shutter too.
- sudosysgen 6y ago
  Not really. Most interchangeable lens cameras do not have a purely electronic shutter, it's a very new feature. Those that do, do not have it as the default mode. There is also the electronic first curtain shutter, but that is way closer to a mechanical shutter than to an electronic shutter.
PointyFluff 6y ago
Such as? Citation needed.
- sudosysgen 6y ago
  Pretty much every single camera that has interchangeable lenses, and thus can mount a telephoto objective sufficient for taking good pictures of helicopters has a mechanical shutter. From the Sony alpha series, to Nikon DSLRs, to the Canon EOS line, and so on.

KaiserPro 6y ago

I don't think we can draw that conclusion. Its the middle of the day with no cloud, so there is plenty of light. That means we can up the shutter speed to the point where rolling shutter is negligible. I have a nikon d7000, which has a rolling shutter. Its only really noticeable when I'm recording video, or when there is _lots_ of movement inside the shutter time. at 1/3200th of second, thats a lot of movement.

sudosysgen 6y ago
While that's true, a smartphone even at 1/3200th will have a 30th of a second or so of rolling shutter.
Sharlin 6y ago
The D7000, like all system cameras, has a mechanical shutter it uses when taking photos. Even though technically ”rolling” as well, it is much faster than a typical electronic shutter due to the way a CMOS sensor must be read out. Phone cameras have no physical shutters and use e-shutter all the time, but your D7000 only resorts to it when shooting video. As a rule of thumb, it takes several milliseconds for a mechanical shutter to traverse the sensor plane, but it takes several tens of milliseconds for an e-shutter to readout the sensor. Shutter speed does not affect this; even at 1/4000s or 1/8000s or whatever the time difference between the top and the bottom of a photo remains the same.