BBC filming guide & BBC criticised for using ENG helicopters too often (merged)

[Robbo Jock]

Headsethair:

That gives your game away. You cannot hope to compare a 42X HD mount with the SDs.

Sling:

..as it is where the debate is going over the SD and HD worlds...

Do you mind me asking, what's HD and SD ? And the debate ? And in what way can one not hope to compare the two mounts ?

Thanks.