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Range Finder Silly Question


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Ok, so I finally bucked up and bought a range finder after many years of walking off distances and guessing how far away I was. First, it was a bit humbling to see how far I actually hit the ball...and second I am looking for clarification on how they calculate distance.

 

Let’s say I lock onto a flag and it says I am 150 our, does that calculation take into effect the height of the flag stick? I assume it does because otherwise we’d all be overshooting distances.

 

For reference I have the Bushnell V4 Tour

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Unless the unit has the "slope" feature and it is enabled (pretty sure the basic "Tour v4" doesn't, although the "Tour v4 Shift" does), it's just a straight line distance from the unit to the flag. The height of the flag doesn't mean or effect anything - unless you mean elevation changes between you and the green. If that's the case, it's up to you to adjust for any elevation changes (just like it was when you paced off distances).

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I looked your rangefinder up, it doesn't have the slope feature so it will read the flag as a straight line not taking into account if the flag is uphill or downhill. Although it is a very useful feature at least the rangerfinder is legal in USGA tournaments.

10.5 deg Titleist 905R with stock UST Proforce V2 Shaft (Stiff flex)
Titleist 990 (3-PW) with stock Dynamic Gold in S300
Taylormade V-Steel 5W & 3W with Grafalloy Prolaunch Red shafts (Regular Flex)
2011 Adams Tom Watson signature wedges in 52 and 56 degrees with stock steel shafts (Player's Grind)
Rife Island Series Aruba Blade Putter

 

"Loft for loft, length for length, and shaft for shaft, the ball will go the same distance when hit on the sweet spot regardless how old the iron."

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I think what i'm understanding your question is that the flag stick is 6-7 feet tall

 

so if you were to shoot the flag, you're actually aiming 2-3 yards higher than you actually are.

 

if that's the case then no, a basic range finder will not calculate that difference, it is purely to measure how far the device is from the particular point you are pointing at.

 

Unless you're talking about a raised green haha

 

That's an interesting question, i never thought about that, but i'm also not nearly accurate enough for that to affect my thinking hahah

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Ok, so I finally bucked up and bought a range finder after many years of walking off distances and guessing how far away I was. First, it was a bit humbling to see how far I actually hit the ball...and second I am looking for clarification on how they calculate distance.

 

Let’s say I lock onto a flag and it says I am 150 our, does that calculation take into effect the height of the flag stick? I assume it does because otherwise we’d all be overshooting distances.

 

For reference I have the Bushnell V4 Tour

A spin-off of what you're asking, but I'll just add that the most valuable benefit I've gotten from my rangefinder purchase several years ago was getting a much better feel for how far I hit my irons (I was also quite humbled). However, I now make better club selections than I used to, I'm sure of that.

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I think what i'm understanding your question is that the flag stick is 6-7 feet tall

 

so if you were to shoot the flag, you're actually aiming 2-3 yards higher than you actually are.

 

if that's the case then no, a basic range finder will not calculate that difference, it is purely to measure how far the device is from the particular point you are pointing at.

 

Unless you're talking about a raised green haha

 

That's an interesting question, i never thought about that, but i'm also not nearly accurate enough for that to affect my thinking hahah

 

This is exactly what I'm trying to figure out, do I need to subtract that 2-3 yards off the distance reading to get an accurate number? I also am not accurate enough for it to make a huge difference but it would be nice to have the number dialed in.

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I think what i'm understanding your question is that the flag stick is 6-7 feet tall

 

so if you were to shoot the flag, you're actually aiming 2-3 yards higher than you actually are.

 

if that's the case then no, a basic range finder will not calculate that difference, it is purely to measure how far the device is from the particular point you are pointing at.

 

Unless you're talking about a raised green haha

 

That's an interesting question, i never thought about that, but i'm also not nearly accurate enough for that to affect my thinking hahah

 

This is exactly what I'm trying to figure out, do I need to subtract that 2-3 yards off the distance reading to get an accurate number? I also am not accurate enough for it to make a huge difference but it would be nice to have the number dialed in.

 

The length of the flagstick from where you are has no implication on yardage. The rangefinder shoots out a laser and once it hits an object (flag, tree, car, house, ship, person, whatever) the laser will bounce back to the range finder and it calculates the straight yardage from there. If the rangefinder has a slope feature, it will make a further calculation and give out its perceived or "plays like" yardage.

10.5 deg Titleist 905R with stock UST Proforce V2 Shaft (Stiff flex)
Titleist 990 (3-PW) with stock Dynamic Gold in S300
Taylormade V-Steel 5W & 3W with Grafalloy Prolaunch Red shafts (Regular Flex)
2011 Adams Tom Watson signature wedges in 52 and 56 degrees with stock steel shafts (Player's Grind)
Rife Island Series Aruba Blade Putter

 

"Loft for loft, length for length, and shaft for shaft, the ball will go the same distance when hit on the sweet spot regardless how old the iron."

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If you shoot a point on the flagstick 6 feet above the cup from the same elevation (assuming an eyeline of 6 feet), the actual distance at 150 yards out from the ball (on the ground) to that exact point on the flagstick is 150.013 yards (under 0.5 inches longer). The distance from the ball to the cup in this scenario is still 150 yards. From 33 yards, the difference is about 2 inches. These are well within the accuracy tolerance of the rangefinder (likely about +/- 0.5 yards).

 

Rangefinders with slope function perform calculations to adjust for the elevation change between the rangefinder and the target point.

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For clarity - assume you’re shooting at a brick wall and assume you’re 6 feet tall. Also assume you’re aiming parallel to the ground towards the wall and you are 150 yards away. The reading 6 feet up the wall would be 150 yards and if you took a tape measure your feet would also be 150 yards. Just like reading the flag itself versus reading the cup,

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9400 already did the math for you. The elevation is pretty much meaningless when calculating straight line distances (not when calculating effective length) even when at large elevation changes.

 

For example, if you have a 100 yard hole on a flat surface, and then drop that green 10 yards, on a straight line that calculates out to just 100.5 yards.

 

A little Pythagorean Theorem does the trick:

 

sqr(100^2 + 10^2) ~ 100.5

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