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What is the difference between the front and the common aim?

Number of visits: Date:2015-08-25

What is the difference between the front and the common aim? What are the advantages of pre differentiation?
Answer: ordinary aiming mirror structure is: eyepiece, differentiation of board (or differentiation wire) variable times the tube (by an external variable double loop control); when the magnification change and differentiation of board because in zoom tube back-end, so object size with changes and differentiation of wire size does not change.
Aim the pre differentiation of board structure is: eyepiece variable times the tube (by an external variable double loop control) - differentiation of board (or differentiation wire); when the magnification change, differentiation in because of the changing times at the front end of the pipe (this is a prerequisite, so the object and crossed also be enlarged or reduced.
Comparison of these two structures can be drawn:
1) lead to differentiation and aiming at the adjustment of the rate of large hours, the line is also followed by a small change in the ratio of small, so that the change is no error, and ordinary post is not.
2) lead to differentiation is basically a glass plate differentiation, because the front aim to be in the middle position of the lens and the objective lens, which is the middle position of the mirror paste metal wire into almost impossible.

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