We have received inquiries regarding the effect of Temperature Anti-drift lens.

Our top lens designer, Nishikubo-san calculated with March Scope 10-60x56High Master.

Temperature Anti-drift Lens is incorporated in the High Master lens system of 10-60×56, 5-42×56, 4-40×52, 6-60×56 so that it will create a more stable lens system that naturally adapts to changes in temperature to maintain focus and clarity over a wide range of conditions. This was originally developed to meet the requirement of Field Target shooters who are sensitive to subtle temperature change.

Comparison with March Scope 10-60×56 High Master

(1) Before : High Master lens system without Temperature Anti-drift Lens

◆Temperature change : 35 degrees Celsius difference

   25 degrees Celsius (77 degrees Fahrenheit) → minus 10 degrees Celsius (14 degrees Fahrenheit)　

◆Change in focal point

   ∞(infinity) → 350m (about 383yard)

When there is a 35 degrees Celsius difference,

focal point first set at ∞(infinity) will be shifted to 350m (about 383 yard). 

(2) After : High Master lens system with Temperature Anti-drift Lens

◆Temperature change : 35 degrees Celsius difference

   25 degrees Celsius (77 degrees Fahrenheit) → minus 10 degrees Celsius (14 degrees Fahrenheit)　

◆Change in focal point

   ∞(infinity) → 1.3km (about 1422 yard)

It may be easy to see the change between infinity and 350m, but it is very difficult for a human eye to detect the difference between infinity and 1.3km. Some people may not feel any focal difference. 

The newly developed  High Master lens system with Temperature Anti-drift Lens incorporated within 10-60×56, 5-42×56, 4-40×52, 6-60×56 High Master models is way less sensitive to temperature difference than ever. This new system will naturally adapt to changes in temperature to maintain focus and clarity over a wide range of conditions.

(*Above is an example based on calculation. When inputting different values, there will be a different result.)

March Scopes passionately support serious shooters so that they can continually enhance their performance 😉

Written by : Mari Morita