I purchased a 4x16 nightforce with the mil xt reticle. I seem to be having issue with eye strain when shooting groups for accuracy. What targets do you use with the mil-xt reticle?
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Join the contest SubscribeI like a small diamond as I find I can line the crosshairs up with the four points and it's pretty natural. This is my favorite:uncommon opinion...when shooting for groups, I like to shoot at an X instead of a +.
If you overlay a + (crosshair) on top of a + (target hold point) it can get a little lost because you lose sight of your aim point, the reticle covers up what you're trying to see...especially with a lower mag (16x) optic.
When you have a + (crosshair) laid out on top of a X (target hold point) it's a little easier to tell that you're actually holding where you want to be holding.
I made a rubber stamp cause I got tired of buying paper targets, so I can use anything handy that will take ink. White paper, yellow paper, card board, yada yada yada.
Short answer, I get less eye strain when i shoot at an "X"View attachment 8544054View attachment 8544055
I rather like this write up from March...ignoring scope specific stuff like ocular lock ringI'd suggest going through the process of setting your diopter a second time. Glassaholic has a good write up; https://www.snipershide.com/shooting/attachments/diopter-adjustment-pdf.7812388/
I really like the idea of the Rubber Stamp, I wonder if Staples or similar can do this with a PDF or? I would make the X in the rubber stamp with each line at 1" long so I could easily use my Ballistic-X app to measure groups with. Then I could stamp almost anywhere on cardboard backers. For LD and such I'd still use my LD targets I designed but rubber stamp sounds so simplistic!uncommon opinion...when shooting for groups, I like to shoot at an X instead of a +.
If you overlay a + (crosshair) on top of a + (target hold point) it can get a little lost because you lose sight of your aim point, the reticle covers up what you're trying to see...especially with a lower mag (16x) optic.
When you have a + (crosshair) laid out on top of a X (target hold point) it's a little easier to tell that you're actually holding where you want to be holding.
I made a rubber stamp cause I got tired of buying paper targets, so I can use anything handy that will take ink. White paper, yellow paper, card board, yada yada yada.
Short answer, I get less eye strain when i shoot at an "X"View attachment 8544054View attachment 8544055
thats what I've got going on...it's by design. It's exactly 1" outside to outside. If you know what you want...I can make you one.I really like the idea of the Rubber Stamp, I wonder if Staples or similar can do this with a PDF or? I would make the X in the rubber stamp with each line at 1" long so I could easily use my Ballistic-X app to measure groups with. Then I could stamp almost anywhere on cardboard backers. For LD and such I'd still use my LD targets I designed but rubber stamp sounds so simplistic!
You mean people pay for targets instead of just printing them off on the printer at work?I'm always fascinated people buy stacks of paper targets in stores.
Haha, I enjoy the little Sharpied on notes that are almost unintelligible to anyone but the shooter. All my targets look like that.Sorry, I don’t have a blank target immediately handy to share, but this one will do.
View attachment 8546041
Eye strain:
If you make your own targets like me, it’s super helpful (for me) to have those big eye chart letters on it to aid focusing. Makes that experience less prone to error and speeds it up.
I also added some other stuff on there too, like the three bar thing cribbed from that Air Force resolution chart.
Do your shoot under range lights when it gets dark? Being in Minnesota where the night get long in the fall/winter, that’s pretty common for me. Anyway, if that’s the case, try turning off the shed lights (shooting position). Sure helps ease the eye strain for me and helps my focus.
Side note:
If you use target software or apps to measure your groups, it can be difficult to find an 1” distance on some targets, so I added a nice and dark 1” horizontal line in the middle.
Omg this is my life!More than once I told myself I would remember something and forgot or jotted something down in my notebook I couldn't interpret later on.
It didn't cross your mind to use the known paper size foe your scale reference?Side note:
If you use PC target software or apps to measure your groups, it can be difficult to find an 1” distance on some targets, so I added a nice and dark 1” horizontal line in the middle.
Omg this is my life!
Your solution is so dead simple I feel like a doof for not considering it.
My god that is so much better than sketching a stupid mini target in my small notebook and then adding notes (that I invariably run out of room for!).
Interesting. I’ve never thought of that.It didn't cross your mind to use the known paper size foe your scale reference?
I always based scale on the 11" paper width. (8.5x11)
Using 11" instead of 1" is more accurate when you're trying to extrapolate group size
Yes. What he's saying is that if your measurements are off by say 1/10" if you measure a 1" reference distance it will be off by 10%. But if you measure an 11" distance that same 0.1" error equates to less than 1% and it will be a much more accurate reference.Interesting. I’ve never thought of that.
I just re-measured a target using 11” paper width for the reference. That particular one averaged out 0.01 MOA larger than when I used my 1” reference. Some groups were 0.02 MOA larger, some 0.01 larger, and one was the same. None of the groups on the 11” ref target were smaller than the 1” ref target.
That target had six 5-shot groups on it.
I’m not a math guy. The pic is never perfectly shot with no perspective errors (either through lens curvature distortion or me not holding the camera perfectly square to the target).
If that is true, you’re saying measuring a larger distance (11”) is more accurate than one 11x smaller (1”)?
Yes, I didn't say you would have smaller groups, I said you would have more accurate groups.Interesting. I’ve never thought of that.
I just re-measured a target using 11” paper width for the reference. That particular one averaged out 0.01 MOA larger than when I used my 1” reference. Some groups were 0.02 MOA larger, some 0.01 larger, and one was the same. None of the groups on the 11” ref target were smaller than the 1” ref target.
That target had six 5-shot groups on it.
I’m not a math guy. The pic is never perfectly shot with no perspective errors (either through lens curvature distortion or me not holding the camera perfectly square to the target).
If that is true, you’re saying measuring a larger distance (11”) is more accurate than one 11x smaller (1”)?
It didn't cross your mind to use the known paper size foe your scale reference?
I always based scale on the 11" paper width. (8.5x11)
Using 11" instead of 1" is more accurate when you're trying to extrapolate group size
Yeah, this is extremely difficult to really really really nail when shooting freehand. I’m a photographer and using a copy stand would be the best thing I can think of (don’t have one). But they take up a fair bit of room, good ones anre fairly expensive for what you get, and all are a hassle.Regarding perspective/angles I find it helpful to take a picture where the edges of the paper are all square with the edges of the picture, the border portion.
Oh, never thought you implied either way (larger/smaller). I just was reporting my measurements.Yes, I didn't say you would have smaller groups, I said you would have more accurate groups.
Ahhhh math. Lol it’s Greek to me man. I trust you.when it computes a baseline scale.
I'm certainly not an expert but I think if you square up the target as best as you can with a freehand camera any discrepancies aren't going to matter.First off, ready for a long post? I apologize; this is really getting into the weeds…especially over something as small as a 0.02 MOA difference lol.
This is for the geeks. Just stop reading if you don’t gaf about being exact.
I really want to thank you guys for the tips. Anything to make the measuring more accurate is good by me. I now understand what you two are getting at with the 11” measurement.
However, upon thinking a little more, here are some more things I’d like your feedback on.
- Further thoughts on lens distortion
- Slightly canted pictures…
- …or with a slightly skewed perspective
- Targets with the corners ripped off
- The inability to print reference marks along the targets edge (laser printer limitation)
Lens distortion
Not sure if either of you have considered this. Usually camera lenses have more distortion on the edges, some markedly so.
I just remembered that when I decided where I was going to put that 1” reference mark, I considered distortion and that’s why I put it roughly in the center.
That’s also why I use the telephoto lens on my phone (77mm in 35mm full-frame terms) as lenses over 50mm (FF) typically have much less distortion than my wide 26mm “standard” lens.
Now, lenses for copy stands are optimized for “flat-field” images (can’t remember the technical term). Lenses in a phone are all over the map; some have a separate wide angle lens and a separate higher mag zoom lens, some have optical zoom, some only digital zoom, etc
Here’s my camera(s)
View attachment 8546181
Take a look at the 35mm equivalents.
In my opinion, the two wider lenses are much too wide for a flat-ish image…although phone cams do all sorts of arcane digital processing in the background to fix issues. And there’s all sorts phone cam of stuff here that I am not an expert on (or am completely unaware of).
Perhaps a 1:1 comparo to full-frame lenses is wholly inappropriate.
Anyway, the upshot is I wonder if measuring 1” in the center is potentially more accurate than 11” horizontally? That’s sort of unanswerable without specifying an exact phone model + lens, of course.
I’m sure there’s some sort of test that would answer this question. Like printing out a fine grid and taking lots of boring pics.
Slightly canted or perspective-skewed pictures, targets with the corners ripped off, edge reference marks
View attachment 8546137
So, I measured along the top because the bottom corners were ripped due to the staples. And note that USUALLY I take shots without cutting off a slice of paper. Sort of a worst case, I suppose.
The pic was slightly canted, so the measurement (thin red line on top) becomes longer than 11”.
I thought maybe I could print reference marks on the paper’s edges to be sure the line is perpendicular (and thus theoretically exactly 11”).
But, as you probably know, laser printers usually can’t print right to the edges. Maybe it would be close enough?
Of course, ensuring the corners are always intact is the easiest and most efficient way I can think of to get a decent shot of obtaining a “perfect” 11” measurement.
I don’t want to mess about correcting perspective in photoshop. Sort of a pain. Ditto with adjusting the cant in the iPhone photos app. Big changes are easy with the app, but tiny corrections are a pain in the ass due to “snapping.”
And even if I can straighten one edge pretty well, the other edge now is revealed to be skewed.
View attachment 8546164
Result is this pic is skewed and unfixable (by me) unless I goof off in photoshop. Maybe there’s an app for that too lol or maybe you wizards have a quick and easy fix?
Geek note: you may have noticed this target pic is the same as the earlier one. So why is there suddenly some corkboard visible on top?
I have forgotten if I did this, but the answer must be that I had already attempted to straighten it, but used the right edge as my guide.
Random notes
Yeah, this is extremely difficult to really really really nail when shooting freehand. I’m a photographer and using a copy stand would be the best thing I can think of (don’t have one). But they take up a fair bit of room, good ones anre fairly expensive for what you get, and all are a hassle.
View attachment 8546149
Plus cheap stands might not be square…
However, I’m shooting the pics in an open range shed outdoors against a cork board. I found standing with the target at eye level at 3x zoom on my iPhone provides the best results.
Shooting straight down freehand is tougher for me to hold everything just right, and there are usually many more lighting issues.
I’ve tried enabling the grid feature, but my camera’s grid is the rule of thirds style and not the most helpful. Having a much finer grid with some lines very near the photo frame’s edges would provide a vast improvement.
You guys let me know how you tackle those issues.
Oh, never thought you implied either way (larger/smaller). I just was reporting my measurements.
I did understand the accuracy thing, and was asking for more info. Sorry if I miscommunicated.
Ahhhh math. Lol it’s Greek to me man. I trust you.
Totally get it. As I admitted, I am going off the deep end into a sort of “what if” space that doesn’t really matter. It’s just interesting in a mind-masterbatory way. Stupid, I know, just humor me.I realize errors stack but think about this. If you measure 11" but due to distortion it's actually 10.9" your 1 MOA group is going to measure closer to 1.01 or 0.99 MOA.
A 1 mph wind reading error can shift your point of impact about 0.1 MOA with something like a 6.5cm or ten times your measuring error. There are so many variables other than just wind that it is, in my optinion, quite inconsequential.