Leupold Mesa 10x50
The Mesa series consists of two porro-prismatic pairs of binoculars with the parameters: 8x42 and 10x50, available in two colour versions (normal and camouflage).
The binoculars are waterproof, nitrogen-filled and all of their air-to-glass surfaces are covered by antireflection multilayer coatings.
| Magnification | Lens diameter | Angular field of view | Prisms | Eye relief | Weight | Price |
|---|---|---|---|---|---|---|
| 10 | 50 | 96/1000(5.5o) | BaK-4/Porro | 18 mm | 917 g | 1127 PLN |
| Real front lens diameter |
Left: 50+/-
0.05 mm Right: 50+/- 0.05 mm |
8 / 8.0 pkt | ||||
|---|---|---|---|---|---|---|
| Real magnification | 9.8+/- 0.2x | 3/3.0 | ||||
| Transmission | 90+/- 3% | 17.5/25.0 | ||||
| Chromatic aberration | Low in the centre, medium on the edge. | 6.8/10.0 | ||||
| Astigmatism | Corrected in the right way. | 7.7/10.0 | ||||
| Distortion | The distance between the first curved line and the field centre compared to the field of view radius: 38% +\- 4% | 4/10.0 | ||||
| Coma | Very low. | 8.1/10.0 | ||||
| Blurring at the edge of the FOV | Blur occurs in the distance of 80% +\- 3% from the field of view centre. | 5.5/10.0 | ||||
| Darkening at the edge the FOV | Slight. | 4.2/5.0 | ||||
| Whiteness of the image | Light purple. | 4/5.0 | ||||
| Collimation | Perfect. | 5/5.0 | ||||
| Internal reflections |
|
3/5.0 | ||||
| Housing | Comfortable against the face and quite comfortable to hold. Slippery rubber on the casing which sticks out a bit near objectives. Twist-up eyecups moderately stable. | 6.6/8.0 | ||||
| Focusing | Quite comfortable central wheel (360 degrees) but it doesn’t move smoothly and squelches. The eyepiece bridge can be defocused under pressure. The ring on the right eyepiece with sharp edges; it is hard to turn and it moves the outer lens. | 2.7/5.0 | ||||
| Tripod | There is a comfortable exit. | 3/3.0 | ||||
| Interpupilary distance | from 57.5 to 73mm | 4/6.0 | ||||
| Closest focusing distance | 4.2 m | 2/2.0 | ||||
| Eyepieces FOV | Apparent field of view of 51.7 deg (according to simple formula) and 48.6 deg (according to tangent formula). | 4/20.0 | ||||
| Field of view | Measured by us amounted to 5.28 +\- 0.03 degrees and it was by 0.22 of a degree narrower than stated in the specifications. | 4/8.0 | ||||
| Quality of the interior of the barrels | Black and matt inner tubes. Grey and small bottom. Black glue and black screws. Diminutive specks of dust. | 4.3/5.0 | ||||
| Vignetting |
Slightly truncated pupils. |
5/8.0 | ||||
| Prisms quality | Good BaK-4. | 8/8.0 | ||||
| Antireflection coatings | Blue-green on the objectives. Green on the prisms. Green-purple on the eyepieces. Low intensity. | 5/5.0 | ||||
| Warranty [years] | 2 | 2/6.0 | ||||
| Final result | 67.1% | 127.4 / 190 pkt | ||||
| Econo result | 0pkt. |
Summary
Pros:
- good transmission,
- quite solid casing,
- very low coma,
- slight astigmatism,
- negligible brightness loss on the edge of the field,
- good correction of chromatic aberration,
- good whiteness rendition,
- high quality of prisms and coatings,
- right blackening inside the binoculars.
Cons:
- truncated exit pupils,
- too narrow field of view,
- not stable ocular bridge,
- a bit too high distortion.
The Leupold Mesa 10x50 is a solid position on the 10x50 class binoculars’ market. The level of its build quality and optics is more or less the same as in the case of very well-known Konica-Minolta Activia and Nikon Action EX. There’s just one Leupold’s problem - the field of view. It is narrower by about one degree than that of its competitors and it’s hard not to have an impression that the binoculars performed well at least in some categories, such as coma, chromatic aberration or brightness loss on the edge, just because its field is limited. Taking into account the presence of the Activa and the Nikon EX on the market with their better than Leupold’s results and significantly wider field of view, and keeping in mind that they can be bought for a price similar to that of the Leupold, it would be difficult to find reasonable arguments for choosing Leupold instead …
