Yr sentence no punctuation - difficult to catch your point.
Anyway, my problem is this: this sporting scope - actually is a telescope - I got an adapter to mount to the D70 (minus the eyepiece) - so it become a simple f7(?) lens. I have to focus by adjusting the focusing tube in the scope and can only check from D70 viewfinder. Problem is that if the light is dim and 'cause of the mag - very difficult to see the faint if it is in focus.
And, btw, the light loss from the scope is much less than a typical camera lens.