FSL cross composition grid focusing screens account
FSL focusing screen has marking level and perpendicular line,
Purpose BE avoid attention in the 45 degree split-image and neglect the level composition.
4/3 focusing screen
APS focusing screen
<FSL cross composition grid characteristic>
FSL cross composition grid manufacture's method is special,Not be incise with the knife but be use laser polishing,So the grid will be a bright line and isn't a black line.Polishing district will make bright degree raise.The grid is transparent will not cover to the target.Because laser polishing grid bright degree about at f1.0~1.4 so the grid is in the f1.0~2.0 will be not obvious above,f2.8~16 will have good result.
<The image of various diaphragm in laser polishing>
<P.1>f1.4
<P.2>f2.0
<P.3>f2.8
<P.4>f4.0
<P.5>f5.6
<P.6>f8.0
If you use AF lens of time,Shrinking the diaphragm will synchronous to complete when the shutter act.Therefore the number which set shrinks diaphragm matter is how much,Will not influence a viewfinder bright degree.
For example the 24-70/f2.8 AF lens using take photo in f8.0 diaphragm,The viewfinder will maintain f2.8 bright degrees<P.3>.