You are a spectacular marksman.
For fun, here's the same AG with period correct accessories from around 1984: more things change, more they remain the same?
The Gehmann 530 and similar like your have, and the older Seibert, Hensoldt, Zeiss counterparts have of course an adjustable iris device (like a Gehmann 510), and also a 1.5x magnifier (and sometimes as your's filters, typically yellow/amber and polarizers, and are very expensive).
The magnifier also functions a a weak diopter/corrective lens. If you have mild myopia sometimes the corrective lens will be sufficient and you can see the target in better resolution. Most old folks have presbyopia however, and they will need the Gehmann 510 like device.
If you need to shoot horseflies at 30 yards the 1.5X is not sufficient, and you'll need a scope, but at 10-15 yards the 530 magnifier and corrective lens may be sufficient? To do that at 75 yards suggests your a young fella with excellent vision?
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