I am about to start photography using LF (probably 4x5). In ususal 35mm or 6x6 c ameras a great deal of care is given to film pressure plates (i.e have a look on the plate of an Hasselblad A12 magazine)It seems that this might be a weak poin t in LF

The question are: 1) Are there several types of film slides for 4x5. 2) Is film planeity and/or proper poisionning always guaranteed ? 3) Is it worth buying the best lenses (apo whatsoever) if one is not sure that t he film is 100% at the right position ? Are these lenses better in real shooting situation .

Thank you for your help L Vuillard