Additionally, it allows you to keep a respectful distance so as not to intrude on intimate moments. My point here is to point out that a lot of the DX lenses have been priced manufactured to keep the price low, to ensure more people buy the DX configurations. Typo in Portrait Lenses: I became discourage about changing to FF due to the cost of FX lenses. I understand where you are coming from. From Camera to Darkroom.