On 2008-11-18, pyotr filipivich wrote:
I skipped the meeting, but the Memos showed that "DoN. Nichols"
wrote on 17 Nov 2008 22:45:02 GMT in
rec.crafts.metalworking :
On 2008-11-17, Gunner wrote:

[ ... ]

If anyone wants to know why most specialists prefer fixed power
optics, Id be happy to expound.

Could it be that the position of the cross-hairs shifts relative
to the target when the focal length is changed, so you have to zero it
at one focal length? (Or even worse -- the sliding components which
implement the zoom may shift with recoil, so even if you stay at a given
zoom point the cross hair point will shift.

So far, all good answers.

Now, think about this. With a variable scope, when you get your
sight picture, how "far away" is the target? Well, that all depends
on what power the scope is set at. E.G., if it is set at 9x and
you're thinking "3x" - "Dang that's close up!", and miss accordingly.

Intersting -- and I had not even thought of that. I would
expect the magnification to become obvious during the moment of shifting
from direct view to view through the scope. But I guess that in trying
to remember everything else you mentioned, you could overlook that.

It has been my experience that getting everything "right" for a
shot (cheek weld, eye relief, pulse, breathing, tension on trigger,
site picture, etc) is hard enough without adding the variable of
movable optics.

[ ... ]

Enjoy,
DoN.

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