Leup 45x Comp Mirage

[Sparky570]

Shooting at 300yrds Saturday,,Leupold 45x Comp,,,TERRIBLE mirage,,????,,is this just the way it is???,,1st time using this scope on bright sunny day,,,wet grass all the way down to target,,sun came up,,,Like aiming at the BOUNCING BALL for a Sing-a-Along,,,LOL,,,very disgusted,,

Eric

 

[JEFFPPC]

Sounds about right with conditions you described. What power scope did it replace.

 

[Sparky570]

Guns new too Jeff,,I have Zeiss 5x25 I can go with but I was Liking the 45x

 

[Sparky570]

Ive been reading,,Modifier Disk???,,neighbor is a machinist I can have him cut a cap,,,but will it help??

 

[JEFFPPC]

Ive been reading,,Modifier Disk???,,neighbor is a machinist I can have him cut a cap,,,but will it help??

I have used these on my GE, did not seem to make ,a lot of difference to me. I have heard others who like them, would be worth a try. There are trade offs with more power but also it will become more familiar with the extra power.

 

[theallcineyes]

Great scope. Use it for 50', 50-yard and 100-yard bench rest. Yes, it DOES focus down to 50' even though Leupold tells me it won't. I have never tried it at 10 meters.

 

[garandman]

I like my 45x.

Not the brightest / clearest, but great magnification.

 

[Tim s]

Ive been reading,,Modifier Disk???,,neighbor is a machinist I can have him cut a cap,,,but will it help??

You do not need a machinist, buy a spare lens cap, even a plastic one will do, and put a hole in the middle of it.
About 2/3-3/4 the diameter of the objective lens should yield improvement.

 

[Bart B.]

When the target image is wrinkled from mirage, nothing can fix the problem. Different air temperatures between target and scope bend the ray's of light before they go into your scope. Air currents move them around the field of view.

The size of the objective lens aperture doesn't matter.

 

[GerryM]

Maybe it,s barrel mirrage due to a hot barrel.
try making a shade that covers the barrel. or a long scope tube to the end of the barrel both help.

 

[davidjoe]

Although it’s unnerving that the aimpoint bounces around, the shot dispersion won’t suffer. Great scores still result. I switched to NF 42x fixed power when e-targets took over at my main monthly venues. There was nothing left to closely scrutinize but the chewed up target face and in weight savings that translated to some 5 more inches of tapered barrel.

 

[Bart B.]

Although it’s unnerving that the aimpoint bounces around, the shot dispersion won’t suffer.

I disagree.

The air currents that move the aim point also move the bullet's trajectory.

 

[BoydAllen]

Although mirage can serve as a wind indicator, and can be useful that way, it should be pointed out that the greatest point of aim displacement takes place during a dead calm, sometimes referred to as shooting in a boil, and that once the wind picks up past a certain point, it is dispersed before it gets up to the level of the target. A friend who was on his first prairie dog shooting trip did not want to wait to put up his shooting bench, or do a proper plan about where to shoot from for his first shots, so he laid down on the ground and took some shots using his bipod. He was surprised to learn that his hit ratio was worse than normal. After that, he set up his portable bench on an elevated position so that his line of sight was well off of the ground. The mirage became much less of an issue, and his percentage of hits increased significantly.

 

[Bart B.]

Maybe it,s barrel mirrage due to a hot barrel.
try making a shade that covers the barrel. or a long scope tube to the end of the barrel both help.

Remove the shade or mirage band if there's any wind. It acts like a sail and wiggles the LOS and LOF.

 

[Tim s]

When the target image is wrinkled from mirage, nothing can fix the problem. Different air temperatures between target and scope bend the ray's of light before they go into your scope. Air currents move them around the field of view.

The size of the objective lens aperture doesn't matter.

First off, this does zero to the size of the objective lens.
It is in front of the lens and, as in every camera ever made, acts to effectively stop the lens down and increase the depth of field which does help somewhat.
That might be why all those expensive March scopes come with an aperture reduction fitting from the factory.

 

[Bart B.]

First off, this does zero to the size of the objective lens.

Agreed, but it reduces the cone diameter and amount of light rays from the target through the objective lens that focus the target image through other lenses onto the second image plane. Exactly like an iris between camera lens elements except it's in front of the lens. Depth of field is increased because more light rays are closer to being parallel. And it reduces the scope exit pupil diameter.

Optically, effective objective len's working diameter is f/number multiplied by focal length. There's a formula using exit pupil diameter and scope magnification to calculate it. Exit Pupil (mm) times Magnification = Objective Diameter (mm).

March says this about their aperture reduction:

"May cut incoming light by as much as 50%, depending on brightness of conditions."

It will always cut incoming light by 50% regardless of the brightness of conditions if its effective diameter is 70.7% that of the objective lens.

Their user manual instructions are incorrect on what moves where when adjusting windage and elevation as well as why range focus settings may not be exact.

​

 

[Tim s]

Well there, as far as answering a question nobody asked that there was a fine job.
I know perfectly well what it does.
The depth of field increase will improve dealing with mirage often.

 

[Bart B.]

Even with wind at target range having the least effect on bullet drift?

What's 15x scope's depth of field at 600 yards with these objective lenses; 50mm and 36mm?

 

[Fred Bohl]

Bart - I'll play

The common definition is: depth of field (DOF) is the distance between the nearest and the farthest objects that are in acceptably sharp focus in an image.

But then what is acceptably sharp focus - for what purpose and to whom?

I'm sorry for drifting away from the OP's original question.

 

[Tim s]

Even with wind at target range having the least effect on bullet drift?

What's 15x scope's depth of field at 600 yards with these objective lenses; 50mm and 36mm?

This would be entirely more productive if you could maintain a consistent train of thought.
Was the OP not asking about ability to get a decent sight picture in mirage?
The attachments help for the given reason....no more no less.
Scope brightness is of less consequence in a benchrest application, for instance, well below a xhair/dot dancing around a target mothball.
While i shoot BR myself, I suspect mirage is oblivious to target particulars.