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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
40mm vs. 50mm
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<blockquote data-quote="Blaine Fields" data-source="post: 18700" data-attributes="member: 183"><p>rickg:</p><p></p><p>The Cat Killer is right in his post, your quibble with the term "light gathering" notwithstanding. There is nothing scientific about the term "light gathering"; everyone understands that the larger the objective, the more light is available to illuminate the object of interest. This concept isn't debatable and is not particularly interesting. </p><p></p><p>Nor is it debatable what was posted about "exit pupil." "Exit pupil" is simply a ratio, the mathematical result of dividing the objective diameter by the power - so as the power is increased, the exit pupil is proportionately reduced. Your comment that "You can stack them [i.e., the various lenses] up in any size, order or distance "see scope length" to achieve whatever pupil size you want" is simply wrong if you mean to imply that "exit pupil" is a function of anything other than objective size and power. </p><p></p><p>While it is true that good glass and coatings enhance the total amount of light that is transmitted, the size of the objective also effects the amount of light that can enter the scope. In any scope for serious work, one always wants to minimize the light loss; but one may not always want or need the largest objective possible - it very much depends upon the application. </p><p></p><p>Read Catshooter's post again. It contains a lot of good information.</p></blockquote><p></p>
[QUOTE="Blaine Fields, post: 18700, member: 183"] rickg: The Cat Killer is right in his post, your quibble with the term "light gathering" notwithstanding. There is nothing scientific about the term "light gathering"; everyone understands that the larger the objective, the more light is available to illuminate the object of interest. This concept isn't debatable and is not particularly interesting. Nor is it debatable what was posted about "exit pupil." "Exit pupil" is simply a ratio, the mathematical result of dividing the objective diameter by the power - so as the power is increased, the exit pupil is proportionately reduced. Your comment that "You can stack them [i.e., the various lenses] up in any size, order or distance "see scope length" to achieve whatever pupil size you want" is simply wrong if you mean to imply that "exit pupil" is a function of anything other than objective size and power. While it is true that good glass and coatings enhance the total amount of light that is transmitted, the size of the objective also effects the amount of light that can enter the scope. In any scope for serious work, one always wants to minimize the light loss; but one may not always want or need the largest objective possible - it very much depends upon the application. Read Catshooter's post again. It contains a lot of good information. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
40mm vs. 50mm
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