Funny how the new style LED head/tail lights produce such a vivid strobing effect on some trains but not on others. Why is this? DB 90 looks the part on the VTEC Mk4 sets!
My best guess is because of two reasons. First is the frequency of the camera versus the frequency of the LED lights. The LEDs will only be on for, to make it easy let's say 0.5s on, 0.5s off, or a frequency of 1Hz (massive exagurration, just making the maths easy). The camera will be taking an image of the LEDs at a different frequency, let's say 1.1Hz. (will probably actually be 24 or 25) Because of this, the LEDs will appear to the camera as going on and off roughly every 5 seconds, because the camera will see 4 or 5 frames of the LEDs on, and then 4 or 5 frames of the LEDs off, because as it takes each frame, it gets gradually further and further out of sync with the LEDs. In acoustics we know this as beating, but it's normally just called interference. The other reason is the rolling shutter on the camera. It seems that the strobing gets faster as the trains get further away (or more specifically, as they get smaller in shot), this means that the shutter rolls over the matrix faster, and as the time that the shutter is over the matrix gets gradually smaller and smaller compared to the time that the matrix is dark, the chance that any part of the matrix is dark as the shutter passes over it gets smaller, meaning as they go into the distance, they appear to be constantly on again.
That DB Was There 2 times! The One There be for was speeding soo Fast I thought I Wouldont Stop at the Mark. I was thinking They Accelerate Really Quickly. I've Seen Those Trains There be for but They Don't Seem rare any More Because I See Them All The Time. Are they Rare?
Smashing film as always mate, wonderful to see class 90s on VTEC still and some beautiful sunshine. Thumbs up from me mate, keep it up.
Good stuff as usual - nice to see my local being featured. Keep up the good stuff. Oh and ten points to Gryffindor for the A400 shot :)
Great sights and sounds
Thanks Matt was nice to watch,
I love virgin east coast trains 🚂 thy are good and 👍🏻 nice to you
12:51 It’s a DB Cargo UK class 90!
4:58 that’s the train that nearly killed me when I was 1/2 way over Holme fen lc
Very good video which I enjoyed watching. :)
Great video!
Nice video!
Nicely just-unbowled shot at 4:58.
Great video there mate especially seeing the class 90 helping the dvt on virgin east coast services
Funny how the new style LED head/tail lights produce such a vivid strobing effect on some trains but not on others. Why is this?
DB 90 looks the part on the VTEC Mk4 sets!
My best guess is because of two reasons. First is the frequency of the camera versus the frequency of the LED lights. The LEDs will only be on for, to make it easy let's say 0.5s on, 0.5s off, or a frequency of 1Hz (massive exagurration, just making the maths easy). The camera will be taking an image of the LEDs at a different frequency, let's say 1.1Hz. (will probably actually be 24 or 25) Because of this, the LEDs will appear to the camera as going on and off roughly every 5 seconds, because the camera will see 4 or 5 frames of the LEDs on, and then 4 or 5 frames of the LEDs off, because as it takes each frame, it gets gradually further and further out of sync with the LEDs. In acoustics we know this as beating, but it's normally just called interference.
The other reason is the rolling shutter on the camera. It seems that the strobing gets faster as the trains get further away (or more specifically, as they get smaller in shot), this means that the shutter rolls over the matrix faster, and as the time that the shutter is over the matrix gets gradually smaller and smaller compared to the time that the matrix is dark, the chance that any part of the matrix is dark as the shutter passes over it gets smaller, meaning as they go into the distance, they appear to be constantly on again.
nice A400M cameo!
what was wrong with class 91s mate why is there a class 90 using the virgin mk4 stock and the dvt was there a problem with the class 91s or something
At 3:56 it’s amazing
3:54: surprised by horn ? ;-)
12:50 Pretendo Electro!
What do you use to film with? Looking for a new high quality 4K video camera?
That DB Was There 2 times! The One There be for was speeding soo Fast I thought I Wouldont Stop at the Mark. I was thinking They Accelerate Really Quickly. I've Seen Those Trains There be for but They Don't Seem rare any More Because I See Them All The Time. Are they Rare?
They're being used by VTEC at the moment to cover for the Class 91's
Virgin east coast are nice to you
When i was a stupid little kid i used to think the class 380 and 158 were the same train XD i failed so hard
NOICE
I see you caught an Airbus A400
3:10 this is train spotting not plane spotting lol
he knows
I wondered which BR class it was. ;-)
Nice service virgin east coast trains are the y are better the East Midlands trains and GWR intercity trains
#class 890 dB
Hehehe 3:55 new underwear for u lol