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snozzberries
Site Supporter
Location: King County Joined: Thu Oct 16, 2014 Posts: 4012
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What do these field of view numbers mean, and how do I compare them? S&B 5-25x56 PM II/LP Kahles K525i DLR
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Fri Sep 17, 2021 3:14 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 51917
Real Name: Steve
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For the first one, at 5x you can see 5.3 meters across at 100 meters distance. Zoom in to 25x, and you can see 1.5 meters across.
Similarly, the second one ranges from 25.2 inches (unzoomed) to 5.2 inches (zoomed) at 100 yards. (WTF, that's a hell of a zoom -- is that real?)
Gotta do the math to convert one system to the other, if you want to compare. But right off the bat, I can tell you that the first one has waaaaay more field of view. Something doesn't seem right here.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Fri Sep 17, 2021 3:17 pm |
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Isildur
Site Supporter
Location: The banana belt of Sequim Joined: Thu Feb 25, 2016 Posts: 2299
Real Name: Jay
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That's 53 centimeters = 20.9 inches and 15 centimeters = 5.9 inches.
_________________ Jay
The Right to Buy Weapons Is the Right to Be Free
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Fri Sep 17, 2021 3:22 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 51917
Real Name: Steve
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Isildur wrote: That's 53 centimeters = 20.9 inches and 15 centimeters = 5.9 inches. I'm doubtful... Those numbers on the first scope look realistic to me, at 1.5 meters to 5.3 meters. Don't you think? The second one seems waaaay off. At 5x you can only see 25 inches across at 100 yards? That's nuts.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Fri Sep 17, 2021 3:24 pm |
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snozzberries
Site Supporter
Location: King County Joined: Thu Oct 16, 2014 Posts: 4012
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That's what's confusing me so much. 5" FOV at 100 yards at 25x? lol yeah right.
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Fri Sep 17, 2021 3:32 pm |
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jukk0u
Site Supporter
Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21147
Real Name: Vick Lagina
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Their Youtube video about the scope claims it has "extra wide filed of view" at low magnification to help find targets. Maybe should read 25 yards FEET@ 5x magnification and 5.2 inches at high magnification?
_________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith
"The said Constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams
“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli
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FJB
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Fri Sep 17, 2021 3:42 pm |
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Duke EB
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Location: maple valley Joined: Mon May 6, 2013 Posts: 2575
Real Name: Earl
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That does seem low. FOV for the Vortex Venom is 4.7 ft at 25x Magnification 5-25x Objective Lens Diameter 56 mm Eye Relief 3.6 inches Field of View 21.2-4.7 ft @100 yds
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Fri Sep 17, 2021 3:57 pm |
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snozzberries
Site Supporter
Location: King County Joined: Thu Oct 16, 2014 Posts: 4012
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So the S&B with 5.3 meter is 17.4feet at 5x? Vortex is 21feet at 5x? Kahles is 25feet at 5x?
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Fri Sep 17, 2021 4:00 pm |
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Isildur
Site Supporter
Location: The banana belt of Sequim Joined: Thu Feb 25, 2016 Posts: 2299
Real Name: Jay
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OK, this made me curious.
S & B 5.3 meters = 17.39 feet 1.5 meters = 4.9 feet
Kahles - Note: All the stores I looked at give these numbers for the Kahles, not the ones listed on the Kahles site: 7.06 meters = 23.16 feet 1.5 meters = 4.89 feet
But that still looked odd. So I called up and sorted list at Opticsplanet of all 5-25x scopes. Almost all showed 4.9 feet @25x but 5x was... interesting.
NightForce ATACR F1 18.7 feet Minox ZP5 25.0 feet S & B 17.4 feet Tangent Theta 25 feet US Optics 16 feet Steiner M5Xi 23.6 feet
Weird.
_________________ Jay
The Right to Buy Weapons Is the Right to Be Free
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Fri Sep 17, 2021 4:08 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 51917
Real Name: Steve
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^ Now we are getting somewhere. I wonder if those original Kahles numbers are supposed to be feet, not inches.
And snozzie, if you're really getting down and dirty, you need to adjust for 100m vs. 100yd too.
But . . . my guess is that the field of view isn't going to be your deciding factor here, as they are all going to be roughly the same.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Fri Sep 17, 2021 4:18 pm |
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jukk0u
Site Supporter
Location: Lynnwood and at large Joined: Wed May 1, 2013 Posts: 21147
Real Name: Vick Lagina
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MadPick wrote: I wonder if those original Kahles numbers are supposed to be feet, not inches.
I wish I'd said that!.... wait!
_________________ “Finding ‘common ground’ with the thinking of evil men is a fool’s errand” ~ Herschel Smith
"The said Constitution shall never be construed to authorize Congress to prevent the people of the United States who are peaceable citizens from keeping their own arms." ~ Samuel Adams
“A return to First Principles in a Republic is sometimes caused by simple virtues of a single man. His good example has such an influence that the good men strive to imitate him, and the wicked are ashamed to lead a life so contrary to his example. Before all else, be armed!” ~ Niccolo Machiavelli
Láodòng zhèng zhūwèi zìyóu
FJB
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Fri Sep 17, 2021 4:21 pm |
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Isildur
Site Supporter
Location: The banana belt of Sequim Joined: Thu Feb 25, 2016 Posts: 2299
Real Name: Jay
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MadPick wrote: ... as they are all going to be roughly the same. Da fuk? One brand I listed above was 16 feet, another was 25 feet. All for 5x. Apparently, 5x is not 5x everywhere!
_________________ Jay
The Right to Buy Weapons Is the Right to Be Free
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Fri Sep 17, 2021 4:23 pm |
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MadPick
Site Admin
Location: Renton, WA Joined: Sun Mar 13, 2011 Posts: 51917
Real Name: Steve
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Isildur wrote: MadPick wrote: ... as they are all going to be roughly the same. Da fuk? One brand I listed above was 16 feet, another was 25 feet. All for 5x. Apparently, 5x is not 5x everywhere! Well, yeah. It also depends on the size of the tube, or whatever factors inside the scope -- I'm not an expert. But you will have differences.
_________________SteveBenefactor Life Member, National Rifle AssociationLife Member, Second Amendment FoundationPatriot & Life Member, Gun Owners of AmericaLife Member, Citizens Committee for the Right to Keep and Bear ArmsLegal Action Supporter, Firearms Policy CoalitionMember, NAGR/NFGRPlease support the organizations that support all of us.Leave it cleaner than you found it.
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Sat Sep 18, 2021 6:54 am |
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SporkBoy
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Location: Deckerville Joined: Wed Jan 13, 2016 Posts: 2944
Real Name: Rob
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5" can be inches but in context it also means arc seconds- stiil pretty narrow.
_________________ “The Democrats are playing you for a political chump and if you vote for them, not only are you a chump, you are a traitor to your race.”-Malcolm X
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Sat Sep 18, 2021 7:22 am |
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Sinus211
Site Moderator
Location: Marysville Joined: Thu Mar 22, 2012 Posts: 13477
Real Name: Mike
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This thread does not deliver
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Sat Sep 18, 2021 10:10 am |
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