Quote:
I thought : I redraw what I see in the RL picture, create a mask in photoshop, change the periscope.dds, done !
too easy ? 
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LOL yes too easy
It won't work that way as intended...
You need to be precise for the scale to work as conceived.
The vertical scale is a means of easily getting distance thanks to simple calculations. Each small mark is not one degree, but approximately 0.6 degrees. Why? Because that is close enough to a
radian and allows
stadiametric rangefinding if you know or can estimate the target's heigth.
A quick example: Looking through the periscope of the Kaiten you see a destroyer whose mast reaches the "10" mark in low power magnification. How far is she?
Asuming a 25 metres mast (A good average for destroyers) you do following maths:
25 metres (mast ) x 100 (The scale "constant" value)= 2500
2500 / 10 (heigth the mast reaches in the scope scale) = 250 metres
The destroyer is 250 metres away.
The same example, but the destroyer is reaching only the "5" in the scale:
25 metres (mast ) x 100 (The scale "constant" value) = 2500
25000 / 5 (heigth the mast reaches in the scope scale) = 500 metres
Got it now?
I created my german periscope reticles for SH3 and SH4 using that same principle, adjusting the marks to the proper size, so I could use them to calculate distance as they were intended. It would be a crime to do all the research job you have completed, and now leave the scale inaccurate.
I will send you a finished scale in a moment, stay tuned. I will just modify my current german one and you are ready to go.
