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Rifle Scopes : meopro 3.5-10x44 RD. question

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Author: koshkin
Subject: meopro 3.5-10x44 RD. question
Posted: December/01/2013 at 00:06

Originally posted by Mike52 Mike52 wrote:

Hey Sparky where do you find there is no standard for light transmission?  Seems kind of odd to me.  You shine 1 watt in the objective and get .95 watts out of the occular as measured with a power meter!  Viola! % light tranmission measurement!  It does not need a standard only some equipment.

Overall light transmission is indeed fairly simple to measure, but it is a pretty meaningless measurement.

There are a few reasons for that.  One is that what you really want to know is transmission as a function of wavelength (i.e. spectral transmission).  The other is that it tells you very little about a scopes performance.

For example, consider two scopes from the same manufacturer that use the same raw glass quality and the same coatings.

However, the have somewhat different optical design with one of the scopes having  somewhat more sophisticated lens system that incorporate an extra optical element in the objective and another in the eyepiece.

You end up with one of the scopes having four more air-to-glass surfaces.  When you measure the overall transmission of the two scopes, you will get a higher number for the less sophsticated scope.  In this case the scope with a lower overall light transmission delivers better image quality and better optical performance.

Since we do not have any information on the specific design of any of the scopes out there and since reverse engineering every scope out there is a bit involved, making a bunch of transission measurements will tell you little to nothing.

ILya

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