C

2 hours ago, Chock said:

The camera's sensor is not suitable for the correct exposure to record something like that however, since it is set to record the stars in the sky which are mere pinpricks of light, such a setting means it's overbright on the recorded image when a bright searchlight/landing light is imaged.

 

He said he was pyrographing his house, not the stars. So a faster shutter speed than a "time exposure" required for stars. Certainly was overexposed in regard to the search light though. 

4 minutes ago, martin-w said:

 

Alternators supply direct current not alternating current, but I think you are on the right track. 

AC generator, also known as alternators, is a machine that converts mechanical energy into electrical energy. The generated electrical energy is in the form of an alternating current sinusoidal output waveform.

But with 4 diodes in a rectifier the AC waveform is converted into a DC waveform and smoothed with capacitors.

AC Generator - Principle of Working, Parts and Schematic Diagram (byjus.com)

 

13 minutes ago, SteveW said:

AC generator, also known as alternators, is a machine that converts mechanical energy into electrical energy. The generated electrical energy is in the form of an alternating current sinusoidal output waveform.

But with 4 diodes in a rectifier the AC waveform is converted into a DC waveform and smoothed with capacitors.

AC Generator - Principle of Working, Parts and Schematic Diagram (byjus.com)

 

 

I cant access the website you linked to. I was defining an automotive alternator. I didn't think an AC generator was referred to specifically as an "alternator", but technical a type of alternator.  For automotive and aircraft  they output DC though, as in your quote above. I'm no expert so I cant argue. 

Must be something like you suggest. 

 

 

Edited June 22, 20214 yr by martin-w

1 minute ago, martin-w said:

C

 

He said he was pyrographing his house, not the stars. So a faster shutter speed than a "time exposure" required for stars. Certainly was overexposed in regard to the search light though. 

Don't really care what he said he was photographing, it doesn't matter, the fact is you could see stars on his image, and to do that, you typically need to have a wide aperture long exposure to gather that light, so any aeroplane landing light would typically look like it does on his picture.

19 minutes ago, Chock said:

Don't really care what he said he was photographing, it doesn't matter, the fact is you could see stars on his image, and to do that, you typically need to have a wide aperture long exposure to gather that light, so any aeroplane landing light would typically look like it does on his picture.

 

No, it doesn't matter. 😒 As I said, I agreed with you, it was overexposed, like I said earlier in the thread before you responded. I was just telling you what he said, that he was photographing his house. 🤨 If his house was reassembly exposed and the stars, then he had balanced the exposure to achieve that, but he wasn't specifically exposing for the stars, my only point. His house wasn't particularly well illuminated, so the exposure was obviously long enough to garner some star detail too. Doesn't matter, forget I even mentioned it

 

You don't need to tell me about exposure, it was my career for a few decades. 

Edited June 22, 20214 yr by martin-w

2 hours ago, martin-w said:

You don't need to tell me about exposure

You'd be a candidate for a stay on the French side of St. Martin. As my buddy from Phillipsburg via Sydney would say...good on ya mate.

 

1 hour ago, W2DR said:

You'd be a candidate for a stay on the French side of St. Martin. As my buddy from Phillipsburg via Sydney would say...good on ya mate.

 

After two hours sleep last night, Ive no idea what you are talking about.

The Airbus H145 uses Pulselite which pulses all the lights 45 times per minute so an exposure time of ten seconds or so could capture eight pulses. Of course, in ten seconds the H145 would travel ten times the distance and that is not what we are seeing.

Pulsing the light allows the filament to run at approximately 70% of normal filament output and only allows the filament to cool to a 15% output state before rising again.

Edited June 22, 20214 yr by dmwalker

12 hours ago, dmwalker said:

The Airbus H145 uses Pulselite which pulses all the lights 45 times per minute

 

Hmm... thought you'd cracked it there for a second.

Edited June 23, 20214 yr by martin-w

martin-w,

According to Metro Aviation Inc., the red light on the H145 is the anti-collision LED light mounted to the top of the vertical stabilizer, . It is powered by DC but they couldn't say whether it is regular DC or Pulsed DC.

On the bright side, I learned about Pulselite which significantly reduces birdstrikes and is widely used, including on B737s and B787s.

On 6/22/2021 at 2:26 PM, martin-w said:

 

 

After two hours sleep last night, Ive no idea what you are talking about.

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