The text book answer is to focus on the foresight, and to use the contrast of the gap around the bull and the bull itself to centre it without losing focus on the foresight. In practise some shooters will focus more on the target if their eyesight allows. For me at least focussing on the target leads to aiming for too long and poor trigger control.

 

I use dual aperture sights for lever action silhouette shooting My biggest gain in score came when i finally started focusing on the front sight and remembering to do that at the start of the match instead of halfway through. Obviously that is a little different front using a front post but the concept is the same. Your eye can only focus at one distance at a time.

 

Your eye can only focus at one distance at a time.

True; although the very small rear apertures found on match rifles do increase depth of focus to where some shooters can perceive the aiming mark clearly enough for contrast.

A prescription lens that focusses the eye just ahead of the foresight is a big help. I'm slightly long sighted, and while I can consciously focus on the foresight, it's so much easier not having to remember.

 

Thanks guys, appreciate the help. I'll go practice now.

 

New shooters tend to open the rear iris too far and close the front aperture too small around the bull. Also, I‘ve tried both .3 and .5 diopters in front sight (SB Prone 50yds/50meters/100yds). The .3 diopter produces a very black round bull; whereas, the .5 is not as distinct. Everyone’s eyes are not the exactly same, and sight radiuses differ with tuners/bloops.