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What is the difference between these two rifle scopes?
5x-40x56 GEN II vs 5x-42×56

We do not just design new scopes! We are always looking for ways we can improve our existing scopes. And now we’ve updated our very popular 5-40×56 FFP scope.

Added features in the New 5x-40×56 GEN ll are;
– Lockable Elevation and Windage turrets
– Fast focus eyepiece
– 6 level illumination module as a standard (for illuminated models)

Please note – There internal optical structure of the 5x-40×56 GEN ll is the same as the 5x-40×56.

We have the 5x-42×56 in the similar magnification range. Now let’s compare these two scopes.

In the picture below, the lower scope is 5x-42×56 WideAngle and the upper scope is 5-40×56 GEN ll

5-42×56 (Lower scope in the picture)

5-40×56 GEN II (Upper scope in the picture)

Lockable turrets
Fast focus eyepiece
Illumination
Length 
Weight
Apparent field of view
Elevation travel
Windage travel
Temperature anti drift lens
Click adjustment options

(All turrets are lockable)
YES
6 level
358mm(14.1inch)
950g(33.5oz)
26 degree
40MIL(equivalent to about 140MOA)
14MIL
YES
0.1MIL

(Side focus turret is not lockable)
YES
6 level
387mm (15.24inch)
950g (33.5oz) , (non-illuminated 915g (32.27oz)
20 degree
22MIL, 76MOA
11MIL
X
0.05MIL, 0.1MIL, 1/8MOA

Length & Elevation

In general (this does not apply to Genesis models), the shorter the scope, the more elevation travel amount it can have.
5x-42×56 is shorter than 5x-40×56 GEN II by 29mm (1.14inch).
By shortening the length, 5x-42×56 has nearly double the elevation travel (40MIL) compared to 5x-40×56 GEN II riflescope (22MIL, 76MOA).

Apparent field of view

5x-42×56 has the widest angle eyepiece among all March Scopes which is 26 degrees.
This is 30% more than our standard models (20 degree).
26 degree apparent field of view will enable you to gain more visual information.
The wide angle eyepiece is useful when you want to have more visual information when hunting for example.
However, you may find some aberration at the peripheral part.

This is an example of 25degree(4.5-28×52) and our standard model (20 degree).
Imagine how much more you can see with 26 degrees !!

Image quality
Shortness of the 5x-42×56 brings in more Chromatic Aberration and to control that we use Super ED lenses (High Master lens system) in the 5x-42×56 Wide Angle Scope. But as the IQ is different between the center and the peripheral part due to the nature of the Wide Angle eyepiece, some people may find the image quality of 5x-42×56 less than 5x-40×56 GEN II. If edge-to-edge clarity is important to you, we recommend the 5x-40×56 GEN II. ( Internal optical structure of the 5x-40×56 GEN II is the same as the 5x-40×56).
Also, in any riflescope the best image quality is at or near the center of the adjustments.
5x-42×56 riflescope has an internal adjustment range of 40MIL; 20 up, 20 down.
Because of the very wide adjustment range of this riflescope, you may experience some image quality degradation as you near the limits of the adjustment range. This can occur because of the extreme refraction of the incoming light at the edges of the objective lens. This degradation will worsen as the magnification increases but if you readjust the focus turret each time, you will be able to see the image clearly. In case you do not wish to adjust each time, we recommend using an appropriate canted rail if you plan to use this riflescope consistently near the limits of the adjustment range and at higher magnification. It can be utilised to gain additional elevation and to keep the scope optically centred as much as possible.

Temperature anti drift lens system

5x-42×56 Wide Angle scope incorporates Temperature anti-drift lens system so that it will naturally adapt to changes in temperature and maintain focus and clarity over a wide range of conditions.

Conclusion…

Even with similar magnification range, features of the scopes are very different.

Based on the above, we can sum it up as below.  Which do you prefer…?

5-42×56 (Lower scope in the picture)

5-40×56 Genll (Upper scope in the picture)

Elevation travel
Temperature anti drift lens
Apparent field of view
Lockable turrets
Click options
Image quality

40MIL(equivalent to about 140MOA)
YES
26 degree
Elevation, Windage, Side focus turrets
0.1 Mil
You may find some aberration at the periphery part

22MIL, 76MOA
X
20 degree

Elevation, Windage turrets
0.05MIL, 0.1MIL, 1/8MOA
Edge-to-edge clarity

Thank you
We will be in-touch soon.