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#6452840 - 09/14/16 10:49 PM Parallax question (updated with pictures)
Matt Hejl Offline
Outdoorsman

Registered: 05/17/11
Posts: 94
I have an older scope that's 4-16 and it has a parallax adjustment on the front lens.

It has the numbers 2,3,4,5,8,infinity, 100, 150, and 50. They aren't in that order though...you have to go different directions to reach some of these numbers.

I kinda understand parallax, but what are the 2-8? And why different directions on the lens?

Thanks

See from first picture to last is me twisting the lens counterclockwise. I cant make sense of the numbers and the order they are in









Edited by Matt Hejl (09/15/16 08:51 AM)

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#6452889 - 09/15/16 01:07 AM Re: Parallax question [Re: Matt Hejl]
booradley Offline
Pro Tracker

Registered: 01/20/11
Posts: 1692
Loc: Justin, TX
I have no idea if the numbers are not in numerical order.
_________________________
I joined the circus to become a clown fighter. I now know 46 different ways to kill a clown.

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#6453230 - 09/15/16 09:25 AM Re: Parallax question [Re: Matt Hejl]
QuitShootinYoungBucks Online   content
THF Trophy Hunter

Registered: 11/01/12
Posts: 6485
Loc: Lubbock, TX
They seem to be in order to me????

50
100
150
2(00)
3(00)
4(00)
5(00)
6(00)
Infinity
_________________________

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#6453272 - 09/15/16 09:46 AM Re: Parallax question [Re: QuitShootinYoungBucks]
Matt Hejl Offline
Outdoorsman

Registered: 05/17/11
Posts: 94
Originally Posted By: QuitShootinYoungBucks
They seem to be in order to me????

50
100
150
2(00)
3(00)
4(00)
5(00)
6(00)
Infinity


The 100 is to the left of the 150 mark, and the 50 is to the right of infinity.

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#6453342 - 09/15/16 10:31 AM Re: Parallax question [Re: Matt Hejl]
Jgraider Online   content
Bird Dog

Registered: 06/13/15
Posts: 265
Loc: West Texas
Originally Posted By: Matt Hejl
Originally Posted By: QuitShootinYoungBucks
They seem to be in order to me????

50
100
150
2(00)
3(00)
4(00)
5(00)
6(00)
Infinity


The 100 is to the left of the 150 mark, and the 50 is to the right of infinity.


If I were guessing I'd bet you cannot just spin this AO around without it stopping somewhere (infinity), correct? If so, set it on the 50 and look at something 50 yds to see if it's in focus, then repeat at each distance. Once you get to infinity, I bet you can't just spin it over to 50, you'd have to reverse the twist all the way back around to 50 and start over. Clear as mud now?

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#6453457 - 09/15/16 12:15 PM Re: Parallax question [Re: Matt Hejl]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6225
Loc: Wise Co.
Maybe the pitch of the mechanism's threads are different on each side of infinity to aid finer adjustment. I've never seen one like that. What's the make?
_________________________


Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6453532 - 09/15/16 01:09 PM Re: Parallax question [Re: RiverRider]
Matt Hejl Offline
Outdoorsman

Registered: 05/17/11
Posts: 94
Originally Posted By: RiverRider
Maybe the pitch of the mechanism's threads are different on each side of infinity to aid finer adjustment. I've never seen one like that. What's the make?


Redfield...its an older 6x-18x

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#6453535 - 09/15/16 01:10 PM Re: Parallax question [Re: Matt Hejl]
Matt Hejl Offline
Outdoorsman

Registered: 05/17/11
Posts: 94
I have never used the scope, but if I mount it and look down it at a range...will I be able to tell if its set correctly by simply just focusing on things at different distances and seeing if its sharp?

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#6453549 - 09/15/16 01:17 PM Re: Parallax question [Re: Matt Hejl]
Jgraider Online   content
Bird Dog

Registered: 06/13/15
Posts: 265
Loc: West Texas
Originally Posted By: Matt Hejl
I have never used the scope, but if I mount it and look down it at a range...will I be able to tell if its set correctly by simply just focusing on things at different distances and seeing if its sharp?


Yes, but you must focus the reticle first. Point the scope at the sky, focus the reticle until it's sharp. Then focus down range using the AO.

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#6453560 - 09/15/16 01:22 PM Re: Parallax question [Re: Jgraider]
QuitShootinYoungBucks Online   content
THF Trophy Hunter

Registered: 11/01/12
Posts: 6485
Loc: Lubbock, TX
Originally Posted By: Jgraider
Originally Posted By: Matt Hejl
Originally Posted By: QuitShootinYoungBucks
They seem to be in order to me????

50
100
150
2(00)
3(00)
4(00)
5(00)
6(00)
Infinity


The 100 is to the left of the 150 mark, and the 50 is to the right of infinity.


If I were guessing I'd bet you cannot just spin this AO around without it stopping somewhere (infinity), correct? If so, set it on the 50 and look at something 50 yds to see if it's in focus, then repeat at each distance. Once you get to infinity, I bet you can't just spin it over to 50, you'd have to reverse the twist all the way back around to 50 and start over. Clear as mud now?


It's a circle, right? Is 50 to the left of 100? List JGR said, I bet you can't spin it past infinity, you have to go all the way back around. If you can spin it past infinity, I'd throw it in the trash.
_________________________

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#6453632 - 09/15/16 02:22 PM Re: Parallax question [Re: Matt Hejl]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6225
Loc: Wise Co.
I'd verify where the stops are when you turn it to the limits in each direction to see if the adjustment ring has slipped.
_________________________


Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6453748 - 09/15/16 03:25 PM Re: Parallax question [Re: Matt Hejl]
booradley Offline
Pro Tracker

Registered: 01/20/11
Posts: 1692
Loc: Justin, TX
Originally Posted By: Matt Hejl
I have never used the scope, but if I mount it and look down it at a range...will I be able to tell if its set correctly by simply just focusing on things at different distances and seeing if its sharp?


You don't need to mount it, or take it to the range to do that.
_________________________
I joined the circus to become a clown fighter. I now know 46 different ways to kill a clown.

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#6453940 - 09/15/16 06:01 PM Re: Parallax question [Re: Matt Hejl]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6225
Loc: Wise Co.
Now I can see the photos on my PC.

In the top photo I see 150, 2(00), 3(00), 4(00) yard marks.

In the middle photo I see 3(00), 4(00), 5(00), 6(00), infinity.

In the bottom photo I see the 5(00), 6(00), and infinity and the 50 yard mark which you would get to by turning the adjustment all the way back the other way. There's nothing goofy about the layout of the markings. It could be that the external ring has slipped, but that does not make the AO unusable.

Turn the objective all the way to through 4(00), 5(00), 6(00), and to infinity. Does it stop when you get to infinity, or go a little ways past it?
_________________________


Originally Posted By: Cleric
God I am hating caliber threads more and more

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#6453953 - 09/15/16 06:10 PM Re: Parallax question [Re: Matt Hejl]
Creedmoor Online   content
Tracker

Registered: 09/12/16
Posts: 694
Loc: Soon to be Hudson Oaks
Originally Posted By: Matt Hejl
I have never used the scope, but if I mount it and look down it at a range...will I be able to tell if its set correctly by simply just focusing on things at different distances and seeing if its sharp?


NOPE. Parallax adjustment has nothing to do with focus. And it's hard to explain.

Let's say that you have a target at 100 yards. When the parallax is adjusted properly, the reticle will remain fixed on the target when you move your eye side to side or up and down. If you move your eye and the reticle moves on the target, the parallax is not set correctly. There is a great explanation in an article that was written long ago by a professional in the optical business. I'll see if I can find it .........

Here you go:

http://www.snipercountry.com/Articles/Parallax.asp

I'd suggest that you bookmark the article and save it for future reference.
_________________________
.
There's a fine line between BRAVE ... and STUPID.


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#6453962 - 09/15/16 06:16 PM Re: Parallax question [Re: Matt Hejl]
RiverRider Online   content
THF Trophy Hunter

Registered: 11/11/07
Posts: 6225
Loc: Wise Co.
The simpler explanation of what the article is saying is that what you see looking "through" the scope is actually a real image suspended within the scope tube, and somewhere within that floating real image is the reticle of the scope. The AO moves the image to and fro within the scope tube so that some planar cross section of the image is in exactly in the same plane as the reticle, and that is where the "parallax-free" relationship between the reticle and the image exists.
_________________________


Originally Posted By: Cleric
God I am hating caliber threads more and more

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