Needing help from a Sightron guru

[MattPeetz]

If your not in focus how would you know if your parallax free.
I’m not trying to argue with you I’m genuinely interested because I just experienced this new 10-50 scope myself installed on a 20 Moa rail that tuned well at 300 but at 550 shot very erratic like my load was off.
Obviously I’ll revisit my load but i certainly was disappointed with the results.

spj
The others have explained it well. No need to re state it

 

[MattPeetz]

No worries Matt, I have it on good authority I’m a Dumb Azz.

I went over all usual stuff so I’ll hit again with a fresh battle cry”
Thx again
J

Lol. Your not a dumb ass. There is just so much mis information out there people believe it

 

[Justin Credible]

First, that is NOT a focus knob. It is parallax knob to bring all the lenses in line so there is no movement of reticle. It just happens to appear like it is focus.
To focus, its the rear ocular.
There is nothing wrong with that scope. Your “useless” range is for 10 yards and out.

It IS a focus knob. It is to focus the target on the reticle. Just like a camera focuses on film. This is what makes for a parallax free condition. The ocular is to focus the reticle to your eye. So there are two focus adjustments on such a scope.

Justin

 

[MattPeetz]

It IS a focus knob. It is to focus the target on the reticle. Just like a camera focuses on film. This is what makes for a parallax free condition. The ocular is to focus the reticle to your eye. So there are two focus adjustments on such a scope.

Justin

Re read a few up. A scope is not like camera

 

[6MMsteve]

I use a light blue sheet of construction paper.go outside tape up the paper start the head bobbin while moving the ocular, I keep bobbin and turning until the hairs are burnt crisp then I'm done..but I could be doing something wrong..once I have crisp clear CH I'm done unles someone else wants to shoot my rifle then we start over again...hope I'm doing it right..I mean I read it on here..geez I could be backwards now what

 

[mike a]

I use a light blue sheet of construction paper.go outside tape up the paper start the head bobbin while moving the ocular, I keep bobbin and turning until the hairs are burnt crisp then I'm done..but I could be doing something wrong..once I have crisp clear CH I'm done unles someone else wants to shoot my rifle then we start over again...hope I'm doing it right..I mean I read it on here..geez I could be backwards now what

Hi Steve, were do you have your paralex set when you do that? Infinity? Mike

 

[6MMsteve]

Hi Steve, were do you have your paralex set when you do that? Infinity? Mike

I think I do.. can't remember...prolly still doing it wrong....give us a step by step..that may be why the 36x Loopy I use is so fine..Pat Miles loaned me the scope I will go see..

 

[Justin Credible]

Re read a few up. A scope is not like camera

Sorry for the long delay on a reply but I've been on the road. The objective of a scope is just like a camera (non-zoom) lens. If you put a piece of film in place of the reticle you would get a photo. Of course in the case of a second focal plane scope there is an erector in there as well, but that doesn't really change things in that regard. The eye piece is essentially a magnifying glass, perhaps with adjustable power, to focus on the reticle. In the old days a camera was focused by placing a piece of frosted glass in place of the film and using a magnifying glass to examine the image. If you take camera lens, say from an SLR, and place a magnifying glass the appropriate distance behind it, you have yourself a telescope with the image inverted. Put a wire in between the two at the same distance from the lens as the film should be and you have a scope (with an upside down image).

I saw where you said "It is parallax knob to bring all the lenses in line so there is no movement of reticle. It just happens to appear like it is focus." This is not correct. The parallax adjustment does not affect how in line the lenses are. It adjusts the spacing of some lenses, which is called focusing. When the objective is focused so that the target focal point is on the same plane as the reticle you are at your parallax free condition. If your ocular is properly focused the target and reticle will all be in focus. If the ocular is a little off then there will be a little blur in the system.

Due to the depth of focus at the distances rifle scopes are used at, it is almost impossible to set parallax properly by just watching how sharp the image is, so the head bob method is the best way to check it. But make no mistake about it, parallax is fixed by properly focusing the objective of the scope.

Justin

 

[jamesdmock]

A good way to focus your scope is as follows: 1) place the parallax knob at infinity, point the scope at the sky and focus the eyepiece until the reticule is black and "clean". 2) Put up a target (say 200 yards) and set the parallax until there is no apparent reticule movement when you move your head back and forth, up and down. Your scope is now set up for shooting at 200 yards. If the yardage is changed, then the parallax focus must be corrected following the final step listed above. Good shooting.....James

 

[Bill Norris]

Here, I drew a picture showing what is going on with the dial. No numbers on the dial just marks with the last having the infinity symbol. You can see the very little rotation from 50 yard to 300 yards and a known 1400 yard marker at our range.

View attachment 1131415

This is the same thing I run into with a new 10 x 50 x 60 SSIII I recently purchased on a custom rifle from a member here as well. I just removed it and replaced it with a 45 x 45 Comp Leupold that I had in my scope stash. No pun intended whatsoever.