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High magnification ratio disadvantage

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2017 at 10:17
Gerry Atric View Drop Down
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Is it a fact that a high magnification ratio in a rifle scope automatically leads to a decreased light transmission ?

We had this discussion a while ago at work, someone claimed that a fixed 8x56 despite it´s age was superior in low light, another said that a modern 3-12x 56 with up-to-date coating was best, the third had the opinion that a Zeiss V8 would outperform the earlier mentioned scopes hands down in low light.

Theoretically an increased number of lens elements is a bad thing, is the advent of high magnification ratio also detrimental regarding light transmission ? (I have seen a solution with two magnification modules in series in order to achieve a high magnification ratio)

Or - Is the answer as always: It depends.....


Gerry Atric
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2017 at 10:31
koshkin View Drop Down
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The answer is that light transmission is not an indicator of how good low light performance in modern riflescopes.  The quality of the coatings across top end manufacturers is about the same.

With that in mind, given the same objective diameter and magnification the best low light performance will be in a scope that is best designed for low light.  

In principle, it is easier to optimize the image quality in a fixed power design than in a variable, so if you asked a top notch designer to start from scratch, a fixed power design would be better than a variable at that specific power.

However, in actual use, where you can use the variable to bump magnification up a little when the light level allows it (and it often does), the practical performance of the variable might actually be better.

Lastly, I am not sure I like Zeiss' V8 that much.  I need to test it carefully, but something looked odd there.  Swarovski Z8 and Leica Magnus impressed me a lot more.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/02/2017 at 17:58
Gerry Atric View Drop Down
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Thank´s for the swift answer Ilya, there´s a lot of parameters involved in the "low light equation", I have a session planned with the Z8, I hope it will suit my ageing eyes.....

Gerry Atric
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