Rifle Scopes Finally got to mess with a NF ATCR F1....and it tunnels? Lol

[Bender]

And it TUNNELS??? Lol. I had no idea. I messed with an S&B a couple years ago that did the same thing. How can it be called magnification when it just tunnels down....

Other than that they were both bad ass scopes. Way out of my budget. I will stick to my casual shooting LOL

 

[EnXCess]

Okay, so my 5-25 is really a 6.5-25. Still glad I got it.

 

[Dthomas3523]

Doesn't the magnification still change? Its still magnification regardless of the FOV. Obviously the whole reason(for me anyway) of having a lower range is FOV, but FOV isn't the same as magnification.

 

[Bender]

No, don’t misunderstand, it’s a bad ass scope. It was just a surprise. Lol

 

[el_cazador713]

About to get my first ATACR. They are absolutely badass

 

[TheOE800]

I just don't get it. I have an ATACR (but the 4-16x doesn't tunnel). It's good. It was expensive for its feature set, IMO. I will not miss it.

 

[el_cazador713]

I do.. rugged, reliable, excellent glass, and a solid warranty.

 

[Xander3Zero]

My 3.5-21x DMR2 tunnels as well, right around ~4x it starts to tunnel. Also the CA and clarity suffers a bit at full 21 power. I think they should have just released it as a 4-20, with no tunneling on the low end, and with consistently good resolution and clarity through the top end.

I think sometimes the manufacturers are eager to produce optics with high zoom ratios to satisfy the demands of gear junkies, and are willing to sacrifice in the way of some tunneling at the low end, or less optical clarity at the high end, etc.

 

[koshkin]

Doesn't the magnification still change? Its still magnification regardless of the FOV. Obviously the whole reason(for me anyway) of having a lower range is FOV, but FOV isn't the same as magnification.

In this case, technically magnification and field of view are related. A riflescope is an afocal telescope and its magnificaiton is defined as the ratio of the field of view projected by the eyepiece to the eye and the field of view of the objective in front. There is some stuff happening on the inside, but for this you can view it as a black box that takes in an image from a narrow FOV and spits it out as a wide FOV for your eye's consumption.

If the FOV of the riflescope at 5x setting is the same as at 6.5x setting, then this riflescope is really a 6.5x to 25x design and the effective erector ratio is ~3.85x. Now, the erector optical system inside may very well be a 5x erector system, but the riflescope as an instrument isn't if there is tunneling limiting the FOV at lwoer magnifications.

ILya

 

[Dthomas3523]

In this case, technically magnification and field of view are related. A riflescope is an afocal telescope and its magnificaiton is defined as the ratio of the field of view projected by the eyepiece to the eye and the field of view of the objective in front. There is some stuff happening on the inside, but for this you can view it as a black box that takes in an image from a narrow FOV and spits it out as a wide FOV for your eye's consumption.

If the FOV of the riflescope at 5x setting is the same as at 6.5x setting, then this riflescope is really a 6.5x to 25x design and the effective erector ratio is ~3.85x. Now, the erector optical system inside may very well be a 5x erector system, but the riflescope as an instrument isn't if there is tunneling limiting the FOV at lwoer magnifications.

ILya

Thank you very much for the info. So, in said scope, if you were say to look at a stop sign at 5x and 6.5. Would the stop sign appear bigger at 6.5 setting but have less field of view off to the side due to tunneling, or would you see the exact same image at 5 and 6.5?

 

[koshkin]

Thank you very much for the info. So, in said scope, if you were say to look at a stop sign at 5x and 6.5. Would the stop sign appear bigger at 6.5 setting but have less field of view off to the side due to tunneling, or would you see the exact same image at 5 and 6.5?

This is the "kinda" part. The stop sign would appear a little smaller at 5x, however, toward the edges there is a balck donut around the image, so the image circle you are seeing is exactly the same at 5x as it is at 6.5x, except it looks a little smaller.

ILya