Heres the white card test showing how to hold it over the gate and then the view through the view finder that shows the image in the gate and how its edge lines relate to the reticle guide lines which are typically hard to see because the black surround renders them impossible to see. The vertical card visualises the horizontal top/bottom guide lines and the horizontal card visualises left/right guide lines. Sounds confusing perhaps, but in practice its super intuitive and makes complete and utter sense in way that makes you say “oh my god thats so easy, I wish I’d thought of that”. And I say you did think of that because this is me talking to myself in some stupid banal commentary on something no one looks at let alone reads…..
