Spitfire Gunsight adjustment?

question: does this quote from the game manual affect Hud sights ?
Second Question: If the above does not affect sights (it must do) then why doesn't it ?

sorry to throw this spanner in the works but its really annoying me. It also could account for discrepancies between using sights at 30 deg or 70 deg, and being out by roughly 50% as someone has mentioned

what deg FoV are you using ???

NOTE: The Close-up or 30° Field of View matches the picture seen by
the naked eye the best. We highly recommend using the 30° lens for most
screenshots or videos.
However this view is not particularly useful in a cockpit as it greatly limits the
viewable area (which however is perfectly in line with what you would see with
a naked eye without having to shift your gaze). The Normal 70° view shows a
larger more useful area but slightly distorts the picture, and the 90° lens shows
an even larger and an even more distorted area of the world. Please be aware of
the distorted dimensions in the Normal and Wide field of views which will render
objects at different distances from the camera with seemingly wrong proportions.

[SEE]

I use my shoulder straps before pressing the trigger. I have noticed that weapons are more accurate/effective when 'strapped in' . It's a worthwhile observation you make as I read sometime ago (before CoD was released) that being 'unstrapped' would incurr penalty and now wondering if that also includes gunnery/accuracy of sights now that you have quoted the manual.

when you loosen straps to get closer to the hud and reticule its still subject to what FoV you are using. i fear the problem is rendering the world differently at different fields of view. but i know that makes no sense. so what is going on.