(20 Apr 2016, 10:45 pm)Davie wrote I think it's due to the shutter speed.
Actually it's due to various factors.
Yes one is shutter speeds.
The other is how often the blinds refreshed.
When LED bus blinds first appeared, success of getting them to show in the photo varied on either camera or the make of the blind. I found that I could regularly get the blind to show on photos if the bus had a LED blind made by Hanover because they were high quality. Yet if the blind was made by Vultron, Bright Tech or Moblitec, the camera would struggle because they would refresh more often (and often not all the blind would refresh at once) and they were often low quality. IIRC Yorkshire Traction had a large number of buses with Vultron blinds.
However these days the bus blinds are more consistant as mainly most Bus blind are made by Hanover with some being made by Moblitec. Blinds made by Vultron and Bright Tech (who both went bust) often ended up getting replaced when they broke because there was no aftermarket care.
Go North East fortunatley used Hanover and have done for many years after originally getting various buses with Bright Tech blinds fitted between J reg and M reg. Then switching to Bright Tech on Small scale at P reg before going all round dot matrix from S reg.