The Optics Talk Forums http://www.opticstalk.com/ This is an XML content feed of; The Optics Talk Forums : Last 10 Posts Mon, 15 Mar 2010 14:10:34 +0000 Mon, 15 Mar 2010 13:56:15 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.54 30 www.opticstalk.com/RSS_topic_feed.asp The Optics Talk Forums http://www.opticstalk.com/forum_images/OPTICSTALK_Logo.png http://www.opticstalk.com/ Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295559#295559 Author: JF4545
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:56

I would like to know the charger story,,,,,,,,,,,,,,,,,,,,,,,,,somebody? , anybody?

]]> Mon, 15 Mar 2010 13:56:15 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295559#295559 Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295558#295558 Author: SVT_Tactical
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:55

I dont' think you can go wrong with any of them Julio.]]> Mon, 15 Mar 2010 13:55:12 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295558#295558 Rifle Scopes : leupold durability http://www.opticstalk.com/forum_posts.asp?TID=22315&PID=295557#295557 Author: pcrage
Subject: leupold durability
Posted: March/15/2010 at 13:54

tough crowd...
 
Rifledude:
 
You must have missed my point...."better" scopes are those that are "better" and "better" means less failures (unless you have some other measure of better or worse)...there is internal logic in this..I am not picking a brand as worse or better...just stating that better scopes fail less.  Do you disagree with this?  You have concluded that I was criticizing Leupold and promoting a different brand but I was not.
 
In any event "in my experience" I have owned scopes that were "better" than the leupold scopes "I " owned measured by failure rate.
 
Is this "better"?
 
PS As far as challenging my honesty...you don't even know me and you say this...sad.
]]> Mon, 15 Mar 2010 13:54:56 +0000 http://www.opticstalk.com/forum_posts.asp?TID=22315&PID=295557#295557 Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295556#295556 Author: SVT_Tactical
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:54

Originally posted by pyro6999

Originally posted by budperm

That was the building the CEO was in.  Its at teh oppisite end of the complex from me.

probably a life safety issue, i would want to be as far away from you as possible as wellBucky
Laughand your unlocked chargers!
]]> Mon, 15 Mar 2010 13:54:20 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295556#295556 Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295555#295555 Author: JF4545
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:51

Bud? Do they keep you shackeled in the back? Big Grin
Graham, We are buying a Eotech, Trijicon-Acog, or Aimpoint.. And there are so damn mnay of them Im not sure which one to buy. Everybody seems to have there own flavor of what they like....I guesss its not a real bad problem to have though is it?
 
 
ewwwwwwwwwwwwwwwwwh,,,Whats that up there with Hunters name on it??Puker


Edited by JF4545 - Today at 13:53]]> Mon, 15 Mar 2010 13:51:46 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295555#295555 Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295554#295554 Author: budperm
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:50

 
            you too Hunter!
]]> Mon, 15 Mar 2010 13:50:46 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295554#295554 Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295550#295550 Author: pyro6999
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:39

Originally posted by budperm

That was the building the CEO was in.  Its at teh oppisite end of the complex from me.

probably a life safety issue, i would want to be as far away from you as possible as wellBucky
]]> Mon, 15 Mar 2010 13:39:20 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295550#295550 Almost Anything Goes : O.T. Coffee House http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295549#295549 Author: budperm
Subject: O.T. Coffee House
Posted: March/15/2010 at 13:38

That was the building the CEO was in.  Its at teh oppisite end of the complex from me.]]> Mon, 15 Mar 2010 13:38:15 +0000 http://www.opticstalk.com/forum_posts.asp?TID=14873&PID=295549#295549 Rifle Scopes : Tubes and Objectives http://www.opticstalk.com/forum_posts.asp?TID=22618&PID=295547#295547 Author: RifleDude
Subject: Tubes and Objectives
Posted: March/15/2010 at 13:37

First of all, despite what it would seem, tube diameter has absolutely no effect on light transmission.  I know that sounds counter-intuitive, but it's true.  The advantages of a larger tube diameter are that it potentially (but not always) provides more W/E adjustment range, it accommodates higher zoom ratio erector assemblies better, and it allows for larger diameter erector lens elements, which theoretically can provide slightly better center field resolution.  All else being equal, larger main tubes are also stronger, but unless you are VERY hard on your scope, that's probably a moot point.  In some cases, 30mm and larger main tube scopes leave more room for a more robust erector spring system, providing better mechanical reliability.

The main reason for the different tube diameters is simply the fact that Europe and all countries besides the US uses the metric system exclusively, and the US has traditionally used the inch system but now uses both.  Therefore, some of the finest scopes you can buy have mm size tubes because that's the standard in their country of origin.  The American shooter had been led to believe the 30mm tube providesbetter light transmission, and the Euro scope manufacturers of course did nothingto dispel that myth because it helped their sales.  In actuality, some of the best low light scopes just happened to have 30mm tubes because for a long time, most of the truly high end scopes came from companies offering only 30mm models. 

The 1" tube scopes are all aimed at the US market, and the Euro scope manufacturers later decided to capitalize on the 1" tube trend in the US.  However, most of the companies that make primarily 30mm scopes but offer 1" scopes for the US market still lavish their best technologies in their 30mm scopes, not because of the tube size, but because they sell more 30mm scopes.  Zeiss is a good example of this.  Though the Conquest line are fine scopes, they aren't as good as the Victory series.

The 34mm, 35mm, 40mm, etc. main tubes are all primarily found on tactical model scopes because the larger main tube provides additional adjustment range and room for more robust erector assemblies and erector support springs.  It's also easier to cram the new higher zoom ratio mechanics into a larger tube.

Concerning objective sizes, larger objective diameters do indeed provide more light transmission.  But only to a certain point.  Whether a larger objective is beneficial or not depends on the magnification and focal length of the optic.  Larger objectives combined with longer focal length can provide slightly better resolution along a greater portion of the field of view because the objective lens used would have less of a parabolic surface.  A larger objective provides a larger exit pupil at a given magnification.  Larger exit pupil = more light that reaches the eye.  An optic's exit pupil diameter is determined by the objective size (mm) divided by the magnification.  So, a 50mm objective scope at 10X would have a 5mm exit pupil.  The general rule of thumb is that a 7mm exit pupil provides all the light the average human eye can use, because that is at or above the maximum dilation of the iris of a healthy young person.  For most adults, 5mm is plenty, though.  So, all else being equal, a larger objective allows you to use more magnification and still have good light transmission and in the process provides less critical eye placement behind the optic.  But, once an optic provides the magic 7mm/8mm exit pupil, you aren't gaining much, if any advantage with a larger objective.  For most hunting, I see no advantage to going beyond a 50mm objective.  If I hunted primarily at night from an elevated blind, as is commonly done in Europe, I can see the advantage of a 56mm objective, as it would allow you to take advantage of excellent low light performance up to 10X or so. 

All optics involve a series of trade-offs, and there are practical considerations here as well.  Is the extra light transmission worth the increased bulkiness of the scope?  That is a personal decision.  Personally, I don't like for my scope's objective bell to be wider than the width of the rifle's forend, because the rifle doesn't fit as well in scabbards and gun cases.  I also think such a scope looks out of proportion to the rifle.  A larger objective diameter requires the use of higher scope rings, so the scope might not line up with your eye naturally when you shoulder the rifle.  For these reasons, I've found that limiting max objective size to 50mm in most cases provides a good compromise between excellent low light performance at the practical magnifications I use and physical size of the scope.  For most hunting scopes on most rifles, I prefer a 32mm - 42mm objective.  I prefer scopes in the 1.5-6X, 2-7X, 3-9X, and 2.5-10X variable range, and these objective diameters are more than adequate for these scopes.

Objective diameter and exit pupil by themselves don't determine optimal low light performance.  Fully utilizing the potential of a large objective requires good optics.  A cheap, low quality scope with a big objective bell won't provide the low light performance of a high end scope with smaller objective but with superb optics.  The overall optical design, number of lens elements, types of glass used, internal baffling, and lens coatings all contribute to overall light transmission.  Lens coatings optimized for light transmission in the blue spectrum provides the best low light performance as well.


Edited by RifleDude - Today at 13:45]]> Mon, 15 Mar 2010 13:37:03 +0000 http://www.opticstalk.com/forum_posts.asp?TID=22618&PID=295547#295547 Almost Anything Goes : Word Association......Go! http://www.opticstalk.com/forum_posts.asp?TID=22372&PID=295545#295545 Author: budperm
Subject: Word Association......Go!
Posted: March/15/2010 at 13:35

Originally posted by Chris Farris

winny the poo
whiney the owner

Edited by budperm - Today at 13:36]]> Mon, 15 Mar 2010 13:35:49 +0000 http://www.opticstalk.com/forum_posts.asp?TID=22372&PID=295545#295545