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Olympus M.ZUIKO Digital ED 45mm F1.8 MSC Lens Review

In this test you will see the M.Zuiko 45 / 1.8 MSC, a lens that Olympus, within its range, classifies it as Premium. With 90 mm of equivalent focal length and maximum aperture, as well as its optical design, makes it the ideal portrait lens. In this test you will see that in addition to these premises, it performs outstandingly in this field.

Small, light, well finished and with a fairly reasonable cost, this 45 mm lens within the Micro 4/3 system comes with a highly attractive approach.

Below we show you a picture of the lens, the design details and operation sheet and the cctt sheet.

Olympus M.ZUIKO

Technical data (according to manufacturer)

Description Value
Image circle Micro 4/3
Weight 116g
Dimensions L = 46 mm
Dimensions Ø = 56 mm
Filter Size 37 mm
Construction 9 Items
Construction 8 groups
The diaphragm plates 7
Horizontal viewing angle 35mm. 27º
Apertura Max. = 22
Apertura Mín. = 1,8
Minimum Focus Distance 50 cm.
Maximum Magnification x 0,11

Tapas and decorative ring.

MTF50% Resolution in study

MTF50% Resolution in study

In this link you can see the sequence of resolution charts.


The center-corner MTF50% evolution is exemplary and the obtained values are excellent ​​in this Micro 4/3 segment. Going a step further can cost much more.

These are the values ​​that the programs that evaluate MTF at 50% contrast give you by averaging the three RGB channels. Now let’s see what happens with color reproduction, with focus on automatic mode and manual made by Lumix G7.


MTF50% Resolution in study

Geometric Distortion:

Focal Dist. % Investment
45 mm. 5 m. + 0,20 A

Lateral chromatic aberrations

Diaphragms f 1:/ 1.8 2.2 2.8 3.5 4.5 5.6 7.1 9 Amplitude
Values % 0,14 0,04 0,04 0,04 0,04 0 0 0 Reduced

≥ 0.3% very poor. | 0.2 to 0.3% Poor | ≤ 0.2% correct | ≤ 0.1% excellent


Slight astigmatism to f 1: 4.5


The assessment that can be made of this lens is extremely positive in all aspects, whether optical, or functional, as well as its cost / quality.

We have already seen the results of all study tests that reflect 45 mm, which is excellent within their typology of use, but without being a superb product, either.

The first surprise in this lens is its small size which fits 100% with the reduction in size of M4/3 cameras. The use of plastic material of good texture and density favors a low weight and, therefore, handling and transport. The surprise continues when you see the pictures, where the central optical quality and bokeh are excellent. If you add that it is not an expensive target (less than 300 €), this 45 mm lens is positioned inside the Micro 4/3 segment as a highly recommended product.


– Overall excellent optical quality for the intended use (centered portraits).

– Excellent construction, handling and finishing.


– Astigmatism visible till f 1: 4.5.

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