All you F-Class HM, Light shift vs POI, Tell me what you know.
- Thread starter diego-ted
- Start date
You can test the condition you are interested in with a scope spotting or rifle in a fixed position with reticle centered on the target and a camera mount for the scope. Roll tape and play it back watch the target move with mirage or changes lighting that you are interested in. There are scope camera systems available but even a simple cellphone mount would work you just don't want the scope to move around while observing/recording the condition. EDIT: I attached three examples of 600 yards still images pulled from video the spotting scope is in a fixed position all vertical shift is due to mirage in the early morning a little over X ring ( on a F Class 600 yard target) so about 4 inches of vertical movement in around 90 seconds.
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Cool, this is what I was looking for. I knew I could use this cell phone for something good. I am going to have to do some light observance.
Thks.
10XSHOOTER
Gold $$ Contributor
LIGHTs UP, Sights UP. LIGHTs DOWN, sights DOWN!
The sights up or down was a factor with apparent target size with light and service rifle iron sights. In my opinion the center stays in the same place. Now mirage and wind are another story. Boil figures in with vertical mirage.
300 yard target, when light went down (cloud cover), the bullet went into lower group, when sun was out, bullets grouped in X-ring. Same hold on all shots (was not holding for wind).
Like you, I have heard that a lot. Do you know what it means when it comes to your hold on the target? Seems like a lot of people regurgitate words without knowing what they mean.
10XSHOOTER
Gold $$ Contributor
Sight picture would always stay the same. 600 yd prone with a service rifle, (M-14) cloud roll over 1/2 minute down. Or if cloudy conditions starting with. If sun came out 1/2 minute up.
jelenko
Gold $$ Contributor
Just to confirm. POI going down when there's cloud cover is opposite of the 'lights down, sights down; light up, sights up'.
Also, as mentioned, if you're aiming at a specific mark [e.g., center dot] on a target, the lights up/sights up, etc doesn't apply.
Correct, I misspoke. I reversed the differences and edited my post above. Thanks.
My target does show POI changes with differing lighting.
I have seen the same. Now I am wondering about angle of sun without the cloud cover??? Thx for the info.
LOL, depending on who your ask, and where you are at!!!
I want you to set up a rifle early in the morning sighted in on something and Leave it alone while you shoot another. Take a careful peek as the sun does it’s job and you can see for yourself. It’s going to bend light and the imagine you see so you are seeing something that is not there in physical form but the image in the scope is how you are receiving it. Your eyes can only receive light, it’s a one way trip from there to you. You will enjoy the test
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Of coarse and you are absolutely right,,, your eyes only see light though.., I should have been more thorough but it’s going to take a few pages to explain the displacement. I was just wanting him to try the test I described And Everyone should do this once... a portion of your hold offs are from image displacement, and you should bag up a rifle early morning on a target and watch it happen.
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I thank everyone for the input, I am surprised more of the National HM are not chirping in?? Does in not bother them, do they know the secret handshake?
Please explain the time frame to shoot the target, was it one large cloud movement between the shot groups? Thx Ted
Warren Dean
Team Savage F-TR
Gotta pay your dues, bud. get out there and figure it out.
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