New Posts New Posts RSS Feed - Trijicon 3-9x40 dot size?
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Check GunBroker.com for SWFA's No Reserve and No Minimum bid firearm auctions.

Trijicon 3-9x40 dot size?

 Post Reply Post Reply   Topic Search Topic Search  Topic Options Topic Options
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 12:17
Tranan View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: February/09/2009
Status: Offline
Points: 85
Could anyone please let me know what size does the dot on a Trijicon 3-9x40 Crosshair or Mil Dot Cross Hair have?
Or what I am mostly interested in is how big would the dot be at 100m?


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 12:37
Rancid Coolaid View Drop Down
Optics Jedi Master
Optics Jedi Master
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 7695
Are you asking about the dot diameter of the mil dots or the center crosshair?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 13:07
Tranan View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: February/09/2009
Status: Offline
Points: 85
I am asking about the illuminated dot in the centre cross hair.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 13:15
Rancid Coolaid View Drop Down
Optics Jedi Master
Optics Jedi Master
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 7695
There is really no "dot" but the center of the crosshairs is illuminated.  It is minimal, no blooming, just the cross hair intersection.

I had the 5-20 with mil dot reticle and liked the illumination for night time hunting.  I closed the fiber optic window and had no illumination during full light.  


Are you looking for bright in full light or just enough to shoot in low light?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 13:54
Tranan View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: February/09/2009
Status: Offline
Points: 85
That I am perfectly aware of but the reason I want to know how big "the dot is" is in order to have a clear idea about how much it would cover the different kinds of targets at 100m.
What I understood so far was that the size of the dot is between 1.3-.4 MOA, which I guess means that when its on its brightest level it is 1.3 MOA while at the lowest level 0.4 MOA. The reticle beeing in the second image plane it should normally mean that the size of the dot will be the same regardless of how many m I am looking at.
Am I getting this right? Will it therefore be safe to say that the size of the "dot" on 100m will be none other than 1.3MOA att full power and 0.4MOA at low power?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 14:08
Sparky View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire


Joined: July/15/2007
Status: Offline
Points: 3190
Are you talking about this scope?

http://swfa.com/Trijicon-3-9x40-Accu-Point-Rifle-Scope-P12874.asp

The illuminated center dot at 3x it is 1.3MOA and at 9x it is 0.4MOA according to the factory literature.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 14:41
Tranan View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: February/09/2009
Status: Offline
Points: 85
Yes, that is the scope.
Now, this is something I don't understand: "How can the dot grow with the magnification when the reticle is in the second focal plane?" I thought those numbers had to do with the brightness.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 17:08
Sapper524 View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: January/25/2010
Status: Offline
Points: 218
Originally posted by Tranan Tranan wrote:

Yes, that is the scope.
Now, this is something I don't understand: "How can the dot grow with the magnification when the reticle is in the second focal plane?" I thought those numbers had to do with the brightness.
 
There isn't really a DOT in the middle of the crosshairs.  Its a standard mildot crosshair but when you have the fiber optics exposed on the rear of the scope a green dot appears in the middle.  The more of the fiber optics on the rear of the scope you expose to light, the brighter the dot in the middle gets.  Think of the cover on the fiber optics on the rear of your scope like an illuminated reticle dial ... you just turning it up and down in brightness without batteries.  It works really well.   
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 17:36
Tranan View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: February/09/2009
Status: Offline
Points: 85
Yes, I understand that and it does not really matter what we call it but what I do not understand is how can this dot/cross or whatever we'd like to call it, change size when the reticle is in the second focal plane? Normally the size of it should be the same at 3x as well as at 9x shouldn't it? Whacko
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 18:04
Sapper524 View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: January/25/2010
Status: Offline
Points: 218
Originally posted by Tranan Tranan wrote:

Yes, I understand that and it does not really matter what we call it but what I do not understand is how can this dot/cross or whatever we'd like to call it, change size when the reticle is in the second focal plane? Normally the size of it should be the same at 3x as well as at 9x shouldn't it? Whacko
 
Originally posted by Sparky Sparky wrote:


The illuminated center dot at 3x it is 1.3MOA and at 9x it is 0.4MOA according to the factory literature.
 
Im following your question now ... and its a good one.  I agree that in the SFP it should remain static.  The change in size according to the factory info above does seem odd.  I can only guess it has something to do with the fiber optics and where its located in the internals in relation to the reticle ... maybe Ilya will chime in.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 18:27
Bitterroot Bulls View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar

Joined: May/07/2009
Location: Montana
Status: Offline
Points: 3380
No, the reticle should change in subtension in the SFP.  The reticle stays the same while the target gets bigger, so the reticle covers less of the target as you increase magnification.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/20/2012 at 18:42
Sapper524 View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: January/25/2010
Status: Offline
Points: 218
Originally posted by Bitterroot Bulls Bitterroot Bulls wrote:

No, the reticle should change in subtension in the SFP.  The reticle stays the same while the target gets bigger, so the reticle covers less of the target as you increase magnification.
 
Okay that makes sense ... so those numbers are the representation in respect to target coverage then.
 
trackin like a scud missle ...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/21/2012 at 19:54
Tranan View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: February/09/2009
Status: Offline
Points: 85
Originally posted by Bitterroot Bulls Bitterroot Bulls wrote:

No, the reticle should change in subtension in the SFP.  The reticle stays the same while the target gets bigger, so the reticle covers less of the target as you increase magnification.
 
Thanks! This definitely makes sense.
Actually my next question was about to be: "How can the reticle become smaler while the magnification increases?" but after reading your answer the question has got its answer.
 
Much obliged!
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Similar Threads: "Trijicon 3-9x40 dot size?"
Subject Author Forum Replies Last Post
SS 3-9x42 vs Trijicon 3-9x40, Mil-Dot Crosshair bwatson Rifle Scopes 2
Butler Creek Size For Bushnell 4200 3-9x40 donlipa Rifle Scopes 9
3-9x40 VX-R Fire Dot cheaptrick Rifle Scopes 34
Need Help Figuring Out Dot Size macky Rifle Scopes 4 11/5/2007 11:45:20 AM
3-9x40 Bushnell Trophy Scope mil-dot omahaguy Rifle Scopes 1
Meopta Meopro 3-9x40 or Vortex Viper 3-9x40 2atlow8 Rifle Scopes 2
Body sizing only?.....Neck sizing? sniper13 Reloading & Ballistics 115
Burris 3-9x40 FF TAC 30 or Leupold 3-9x40 MK AR ar15a292f Tactical Scopes 4
Leupold 3-9x40 Vari-X II vs.Zeiss 3-9x40 Conquest dunagan15 Rifle Scopes 69
4200 Elite 3-9x40 or Nikon Team Primos 3-9x40 dunagan15 Rifle Scopes 20


This page was generated in 0.316 seconds.