is it really necessary to get an HD field monitor? i'll admit, i'm not a sophisticated shooter, i use monitors to check framing, make sure every part of wardrobe/set/makeup is good to go, make sure no shine, spill, obvious issues with light. make sure the product looks nice. do i really need to have HD to assess those things? i could see for checkng focus, but i'd hate to pay 3000 dollars for a focus checker. the focus assist seems to work pretty good.