Rifle Scopes Max internal elevation 30mm 34mm 35mm.

[dieselgeek]

I'm doing a review on a couple of scopes, and it's to my understanding that a bigger tube for the most part = more room for elevation.

Just wondering how the SWFA line gets 36 mils of travel (windage and elevation) from a 30 mm scope tube, when most companies are using 34 and 35mm tubes.


Thanks

DG

 

[dieselgeek]

Come on, NO answers to this?

 

[JMGlasgow]

What magnification is the SWFA scope. Typically, the more magnification, the less adjustment. And fixed power scopes usually have more adjustment than variable power. Tube diameter also plays a role in internal adjustment.

 

[johnsmith1775]

The new SWFA is 3-15X. I'm not sure how they crammed that much adjustment into it.

 

[JMGlasgow]

The erector tube is probably shorter than most giving it more room to move around inside. Or the erector lenses and collector lens is a smaller diameter, also allowing more room for the erector tube to move around.

 

[dieselgeek]

Thanks Glasgow

 

[Andy Warhog]

you could just call and ask. weird concept, i know

 

[dieselgeek]

you could just call and ask. weird concept, i know

I did shoot an email to Skylar, but have not heard back. Also the person that answers the phone at companies is not always the most knowledgeable.

 

[Montana]

Tube size has nothing to do with overall travel actually.

It is true that a larger tube 'could' accommodate a larger range of movement by giving more physical room for the erector tube to move around, but the actual travel is determined by the manufacturer choosing a particular size and range of movement. For example, some large scopes do not have large ranges of movement, like a few of the Vortex scopes. And as shown above, the small (30mm) tube SWFA models often have vast internal travel distances.

You can relate the two, but more often they are not related, the total internal travel is regulated by R&D choices from that particular company.

 

[dieselgeek]

Thank you, I was always under the impression that it was relative to the size of the housing.

 

[Montana]

Think of it kind of like a lens within a tube, if that lens is small, it can move a lot up and down inside of the tube, if its larger, it moves less.

That's basically what it equates to, larger lens, smaller range of movement, smaller lens, larger range of movement.

So a larger tube could accommodate a larger range of movement for the same size lens.

There are image quality and other trade-offs, so that's why it doesn't match up. Some people use larger lens and small people use smaller.

Its actually a lot more complex, but thats the easiest way I can think to explain it.

 

[BigJimFish]

Somehow Zeiss manages to get 70MOA of travel out of a 1" tube in both the 3-15x and 5-25x HD5's. That is more travel than a 30mm 5-25x USO and enough to get a .308 to 1000 with a 20 moa base.