The AOB finder should be for a specific zoom level! This was so in the original OLC version for the maximum zoom level. I suggested to add a scratch-mark at the 15 degree AOB mark (MaGUI3.4 stil has it), to help correct for the lower zoom level. (sin(14.5 degrees)=0.25, equal to 1.5x/6x) But this mark is pretty useless now since that AOB finder is calibrated for 15x zoom. And converting 15x zoom to 6x zoom would require a mark at about 23.6 degree AOB. There actually is a very obscure scratchmark on it. I don't know if it it intentional or not, or even accurately placed, but if you have sharp eyes you can use it with reasonable accuracy.
The steps for 6x conversion:
1. Measure mastheight in the scope at 6x zoom. I will name this "observed mastheight" or OMH for short.
2. Find OMH on the inside scale of the middle wheel. Align it to the faint scratchmark at 23.5 AOB. You should get OMHx2.5 at the X (90 degrees AOB) position at the top.
3. Find target range (on the outside scale of the middle ring)as it is aligned to the mastheight (recognition manual value, on outer ring)
(you can check this for accuracy with the notepad stadimeter)
Follow-up to get AOB in x6 zoom: (previous steps are required, or atleast: actual range must me aligned with mastheight from the recognition manual!!!)
4. Grab the mastheight point (on the basis-scale, on the outer ring) and drag it further to the target length on the same scale.
5. Grab the 23.5 degree AOB location (faint scratchmark) and move it up to the X-mark at the top, at 90 degrees.
6. Measure the "observed halve-shiplength" through the scope. (make sure the scope is locked on target) I'll name this OHSL for short.
7. Now the AOB of the target is opposite the observed half-shiplength (OHSL).
To use the MaGUI 3.4 AOB finder at 1.5x zoom you should set the Observed Mastheight at the bottom of the view under the centerline during step 1. And during step 5 you should spin the middle wheel exactly a halve turn instead of relying on a scratch mark.
The wheels are slightly distorted (already were like that when OLC made them) and Makman seems to have given all his turning dials an excentric center, so the accuracy is not completely top-notch. But it is reasonable.
The speed trick is magnification independant. Set the time in seconds (on outer scale of middle ring) against the target length (Basis scale on outer ring), then read speed at the "S"-mark.
|