I'll try and explain what FOV is.
Raise your right hand to the right side of your face, move it backwards until you can only just see it. Now move it away from you, keeping it so it is just visible to you. Do the same on your left side, and the angle between the two lines is your Field Of Vision.
So what will happen when we change our FOV?
Think of a fish; fish have a very wide FOV, you may have heard of fish-eye lenses that recreate this effect.
Birds of prey can adjust their eyes to see very far by narrowing their FOV.
The higher value you set FOV to, the wider the angle of vision becomes until the lines of vision go behind the camera and the image turns upside down!
I made a little program to try and show what Camera FOV does.
set display mode 1024,768,32
hide mouse
sync on : sync rate 60
set gamma 0,0,0
white=rgb(255,255,255)
blue=rgb(40,150,190)
backdrop on
for c = 1 to 99
make object cube c,20
color object c,blue
set object specular c,white,2
set object ambient c,blue
position object c,(c-50)*30,0,0
yrotate object c,45
next c
for p = 100 to 101
make object cylinder p,40
scale object p,100,1,100
set object p,1,1,1,1,0,1,1
ghost object on p
next p
color object 101,blue
position object 101,0,16,0
position camera 0,100,-100
set camera view 0,100,screen width(),screen height()-100
ink white,0
set text opaque
fov#=1.08
set camera fov fov#
focus=50
set gamma 255,255,255
DO
u=upkey() : d=downkey() : l=leftkey() : r=rightkey()
focus = focus+(r*1)-(l*1)
if focus < 1 then focus = 1
if focus > 99 then focus = 99
fx=object position x(focus)
position object 100,fx,-16,0
point camera fx,0,0
fov# = fov# + (u*0.01) - (d*0.01)
if fov#<0.01 then fov#=0.01
set camera fov fov#
text 10,10,"Camera FOV: "+str$(fov#)
text 10,25,"Observing Object: "+str$(focus)+" "
sync
LOOP
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