![]() ![]() ![]() Because the image and the reticle are both in the same focal plane when the magnification is increased in a variable scope both the image and the image of the reticle are magnified exactly the same amount. This means that the reticle and the image of the target are both in the same focal plane and so the subtensions of the reticle are always exactly the same by comparison with the image at all magnification settings in a variable rifle-scope. If the reticle is placed in the first focal plane just ahead of the adjustment turret. The second focal plane is to the left of the diagram where the yellow lines converge just before the eyepiece of the riflescope The first focal plane is where the yellow lines representing the light rays converge at the right of the diagram just ahead of the adjustment turret. Cutaway diagram of a Schmidt and Bender riflescope. ![]()
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