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Rifles, Reloading, Optics, Equipment
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Nightforce Scope
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<blockquote data-quote="Brent" data-source="post: 15199" data-attributes="member: 99"><p>Fatboy and S1, you are at odds over this. <img src="http://images/icons/confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>I just read this yesterday on Gerards site about his Exbal program;</p><p></p><p><strong>The basic concept is that the program will use the "holdover" value associated with each reference bar to calculate the distances at which the bullet will strike a "point blank range" target. The point blank target is defined by a circle whose diameter is specified by the user. There is the Zero range at which the bullet would strike the center of the target. Secondly there is the "MIN" range at which the bullet would strike at the top of the circle. And finally there is a "MAX" range at which the bullet would strike at the bottom of the circle.</strong></p><p><strong></strong></p><p><strong>The reticle specifications for four different reticles are pre-defined. The user has the option of specifying any other reticle configuration. These specifications consist of holdover values for each bar or dot along the verticle axis and a units of measure - Minutes of Angle (MOA), Inches per hundred yards (IPHY), of Mil Radians (MILS).</strong></p><p><strong></strong></p><p><strong>Finally there are specifications to define the scope being used. They consist of the maximum power and the reticle location. A reticle located in the first focal plane grows or shrinks along with image size when the power is changed. This is common in the Eurpoean scopes. A reticle located in the second focal plane stays the same size as the power and image size changes. This is common in American scopes.</strong></p><p><strong></strong></p><p><strong>When the second focal plane location is specified, Exbal calculates the actual holdover values that correspond to the actual (operating) power setting. A power factor is also shown, it is the ratio of the operating power to the maximum power. (Note: The power factor can be used to adjust "come ups" computed for the main cross hair when the scope is not at full power setting.)</strong></p><p><strong></strong></p><p><strong>There are two optimize functions. The first determines the sight in distance (main cross hair) so that that a specified reference bar or dot will strike the center of the circle at a distance specified by the user.</strong></p><p><strong></strong></p><p><strong>For scopes with reticles located in the second focal plane there is an additional option to determine the power setting needed so that a specified reference bar or dot will strike the center of the circle at a distance specified by the user.</strong></p><p></p><p>[ 01-28-2003: Message edited by: Brent ]</p></blockquote><p></p>
[QUOTE="Brent, post: 15199, member: 99"] Fatboy and S1, you are at odds over this. [img]images/icons/confused.gif[/img] I just read this yesterday on Gerards site about his Exbal program; [B]The basic concept is that the program will use the "holdover" value associated with each reference bar to calculate the distances at which the bullet will strike a "point blank range" target. The point blank target is defined by a circle whose diameter is specified by the user. There is the Zero range at which the bullet would strike the center of the target. Secondly there is the "MIN" range at which the bullet would strike at the top of the circle. And finally there is a "MAX" range at which the bullet would strike at the bottom of the circle. The reticle specifications for four different reticles are pre-defined. The user has the option of specifying any other reticle configuration. These specifications consist of holdover values for each bar or dot along the verticle axis and a units of measure - Minutes of Angle (MOA), Inches per hundred yards (IPHY), of Mil Radians (MILS). Finally there are specifications to define the scope being used. They consist of the maximum power and the reticle location. A reticle located in the first focal plane grows or shrinks along with image size when the power is changed. This is common in the Eurpoean scopes. A reticle located in the second focal plane stays the same size as the power and image size changes. This is common in American scopes. When the second focal plane location is specified, Exbal calculates the actual holdover values that correspond to the actual (operating) power setting. A power factor is also shown, it is the ratio of the operating power to the maximum power. (Note: The power factor can be used to adjust "come ups" computed for the main cross hair when the scope is not at full power setting.) There are two optimize functions. The first determines the sight in distance (main cross hair) so that that a specified reference bar or dot will strike the center of the circle at a distance specified by the user. For scopes with reticles located in the second focal plane there is an additional option to determine the power setting needed so that a specified reference bar or dot will strike the center of the circle at a distance specified by the user.[/B] [ 01-28-2003: Message edited by: Brent ] [/QUOTE]
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