Target height.....

[snayperskaya]

If a target/object is 80cm high at 0m how high will it appear to be at say 300m?

Is it simply a case that it will appear to be 3 times smaller?, so 800mm divided by 3 = 266-ish mm

[Mike95]

Use a scope... ?

Mike95

[Mattnall]

It doesn't work like that, I'm afraid.

What are you after? If you held a 80cm target at 300m what size target would you need at the firing point to just completely cover it?

To answer I'd need to know how far the 80cm target is when you first take a look at it and where you want to make the comparison. If you compare it right at your eye then the target at 300m is infinitely small but if it's at the end of your rifle away from your eye then you can work out the size of the disc that will exactly cover the target at 300m (incidentally at 1m from your eye a disc just under 0.03mm diameter would completely cover a 80cm target at 300m).

[nickb834]

If a target/object is 80cm high at 0m how high will it appear to be at say 300m?

Is it simply a case that it will appear to be 3 times smaller?, so 800mm divided by 3 = 266-ish mm

It would appear your choice of 0m makes the maths say it looks exactly 80cm tall at 300m - as Mattnall says, however - if you plumb in some numbers other than 0 as per this answer:

https://math.stackexchange.com/question ... n-distance

Then for eg = 0.8m target viewed at 1m, and then moved to 300m - how big will it appear to be:

0.8m viewed at 300m but measured holding a measure vertically aligned with the object at 1m from the observer:

Apparent height at 300m = Apparent height / Measured at = Object Height / Object Distance

Or

X = X / 1 = 0.8 / 300m = 0.002667m OR 2.667mm

....I think

[Mattnall]

Sorry, I had a stutter on my post above, it should have read just under 0.003m or nearly 3mm.

[bradaz11]

americans doing something for man size at 300 yrds

https://www.m14forum.com/threads/size-o ... 0m.196692/

[Daryll]

If a target/object is 80cm high at 0m how high will it appear to be at say 300m?

Is it simply a case that it will appear to be 3 times smaller?, so 800mm divided by 3 = 266-ish mm

It would appear your choice of 0m makes the maths say it looks exactly 80cm tall at 300m - as Mattnall says, however - if you plumb in some numbers other than 0 as per this answer:

https://math.stackexchange.com/question ... n-distance

Then for eg = 0.8m target viewed at 1m, and then moved to 300m - how big will it appear to be:

0.8m viewed at 300m but measured holding a measure vertically aligned with the object at 1m from the observer:

Apparent height at 300m = Apparent height / Measured at = Object Height / Object Distance

Or

X = X / 1 = 0.8 / 300m = 0.002667m OR 2.667mm

....I think

A simpler way it to say that if its 80cm at 1m, at 300m it will appear 300 times smaller... :-)

[snayperskaya]

I haven't explained myself very well to be honest and maths isn't one of my strong points.....

What I want to do is make some plywood "Fig 12" type target boards that I can use at 100m but size them accordingly so that they would in effect "appear" to be at 300m......hope that makes more sense.

[bradaz11]

I haven't explained myself very well to be honest and maths isn't one of my strong points.....

What I want to do is make some plywood "Fig 12" type target boards that I can use at 100m but size them accordingly so that they would in effect "appear" to be at 300m......hope that makes more sense.

according to that other post
Assuming the man is 19" wide by 70" tall when facing you and standing at 300m:
A 100m scaled target would be 6.33" wide by 23.33" tall.

so a fig12 is a half height man isn't it? so 6"x12" would be about right

[snayperskaya]

I haven't explained myself very well to be honest and maths isn't one of my strong points.....

What I want to do is make some plywood "Fig 12" type target boards that I can use at 100m but size them accordingly so that they would in effect "appear" to be at 300m......hope that makes more sense.

according to that other post
Assuming the man is 19" wide by 70" tall when facing you and standing at 300m:
A 100m scaled target would be 6.33" wide by 23.33" tall.

so a fig12 is a half height man isn't it? so 6"x12" would be about right

That sounds right to me......I wasn't that far out with my 266mm/10.47"