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I could be wrong about the increase from 1.6x to 1.8x in my C8 by placing the barlow in the front of the diagonal instead of the bino. With the lens in the front of the diagonal it extends the focal plane further out. To compensate for this you need to back the mirror off to reach focus again. This changes the focal length of the scope by reducing it, thus negating the effect of increasing the focal length with the barlow placed in that position. These changes do not hapen in a fixed focal length scope like a standard refractor or newtonion. Will check to see if this works out when the sky clears. I am expecting that if I focus a star using a diagonal, then placing the 1.6x barlow in the front of it then the bino into the diagonal, there should be minimal refocusing needed. The overall effect amplification of this setup should still be close to 1.6x.
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