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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
IOR question
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<blockquote data-quote="Pdvdh" data-source="post: 270123" data-attributes="member: 4191"><p>I have two of the 3-18x42mm IORs. They have excellent clarity and resolution, but their light transmission is not great. My belief is that in order to obtain the 6x power magnification range (6x3=18), additional lenses are required to be placed in this scope. Each additional lens will reduce the light transmission through the scope - there's no way around that law of physics. I've compared the light transmission of this scope to a number of my other scopes, and it ranks near the bottom - however the other scopes have 3 or 4X power magnification ranges. I have never seen this fact expressed in all of the posts and comments I've ever read about the 3-18X IOR. Maybe no one wants to get credit for saying anything less than "outstanding" about the scope.</p><p></p><p>The 3-18X IOR is a great scope for daytime use and I really like the MP-8 reticle. However if light transmission is your priority, then I could not recommend the 3-18x42mm IOR. I don't believe the 42mm objective is the only, or necessarily the primary, cause of the reduced light transmission, because I've looked through other 42-44mm objective lens scopes with greater light transmission. I haven't confirmed this fact with IOR, but I believe the cause of the reduced light transmission is the need for, and placement of, additional lenses in the scope to provide the 3-18x power range.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 270123, member: 4191"] I have two of the 3-18x42mm IORs. They have excellent clarity and resolution, but their light transmission is not great. My belief is that in order to obtain the 6x power magnification range (6x3=18), additional lenses are required to be placed in this scope. Each additional lens will reduce the light transmission through the scope - there's no way around that law of physics. I've compared the light transmission of this scope to a number of my other scopes, and it ranks near the bottom - however the other scopes have 3 or 4X power magnification ranges. I have never seen this fact expressed in all of the posts and comments I've ever read about the 3-18X IOR. Maybe no one wants to get credit for saying anything less than "outstanding" about the scope. The 3-18X IOR is a great scope for daytime use and I really like the MP-8 reticle. However if light transmission is your priority, then I could not recommend the 3-18x42mm IOR. I don't believe the 42mm objective is the only, or necessarily the primary, cause of the reduced light transmission, because I've looked through other 42-44mm objective lens scopes with greater light transmission. I haven't confirmed this fact with IOR, but I believe the cause of the reduced light transmission is the need for, and placement of, additional lenses in the scope to provide the 3-18x power range. [/QUOTE]
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IOR question
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