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Question on "3rd plane" for sights

519 Views 5 Replies 5 Participants Last post by  pe3d
I know windage and elevation. What is the purpose of a 3rd plane adjustment on a target sight? Is it to bring the pins into better focus per the archer's preferences (or eyesight) or does that 3rd plane adjustment mean something completely different?
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It is for making sure that your sight is "square" with your bow. Have you ever shot to the left or right when shooting uphill or downhill, but shoot fine when shooting on level ground? If you ever noticed this it could be your 3rd axis is off.
 

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I know windage and elevation. What is the purpose of a 3rd plane adjustment on a target sight? Is it to bring the pins into better focus per the archer's preferences (or eyesight) or does that 3rd plane adjustment mean something completely different?
3rd AXIS

IT's just the DOOR SWING angle.


Imagine that your sight ring is a DOOR.

Now, imagine the door hinges,
so that you can SWING the door
and change the angle of the door swing.

Let's say you bump your sight ring against a tree
and then the DOOR swings towards your face 45 degrees.

This is an EXTREME example.

If the arrow is level,
the sight bubble will still be in between the two lines.

Now,
climb into your tree stand,
and aim the arrow downhill.

Be very careful to NOT tilt the top of the bow.
The bow is still aimed downhill,
but the bow is NOT tilted left,
the bow is NOT tilted right.


Now,
look at your sight bubble.

Guarantee you the bubble will NOT be in between the two lines.


That's what the door swing angle adjustment is for.
 

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3rd AXIS

IT's just the DOOR SWING angle.


Imagine that your sight ring is a DOOR.

Now, imagine the door hinges,
so that you can SWING the door
and change the angle of the door swing.

Let's say you bump your sight ring against a tree
and then the DOOR swings towards your face 45 degrees.

This is an EXTREME example.

If the arrow is level,
the sight bubble will still be in between the two lines.

Now,
climb into your tree stand,
and aim the arrow downhill.

Be very careful to NOT tilt the top of the bow.
The bow is still aimed downhill,
but the bow is NOT tilted left,
the bow is NOT tilted right.


Now,
look at your sight bubble.

Guarantee you the bubble will NOT be in between the two lines.


That's what the door swing angle adjustment is for.


I have spend so much time attempting to figure that out, and that is, BY FAR, the best explanation of 3rd axis leveling I have read to date. Thank you sir:darkbeer:
 
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