. A white pillar looks white in the sunshine.
There is a small amount of chromatic aberration, a bit more noticeable off axis. However, strangely the slight blue fringe to the white pillar is to the left more or less throughout the field of view as one pans left-to-right.
I don't know if this is because of some prismatic effect. I will try to look at star images to see if they are one-sided. In normal use, this effect is not seen. A very small amount of yellow fringing to the right of the pillar. For my purposes the small amount of fringing colour is not significant, but I will leave it to the birdwatching specialists to give a proper review from their perspective.
The pincushion distortion occurs more at the bottom of the field of view than the top, where there is almost no distortion. There is slight pincushion distortion at the left and right edges.
The image is generally good although very near the edges it is unsharp.
For me, the apparent field of view is not very large. However, this binocular is more at home at very close distances, for instance, to look at creepy crawlies. For this it must have few rivals.
At close distances, I get good stereo images, even though the objectives are very close together.
Weighing the binocular again on a horizontal surface I get the weight to be about 294.9 g i.e. 295 g.
The instruction leaflet says that the weight is 290 g. 10.2 oz.
Specifications. Type. Porro prism, centre focusing (Linked-dual-axis).
Real field of view 7.5°.
It gives the eye relief as 15 mm.
Eye width (ocular distance) adjustable range 56 mm to 74 mm 2.2 in. to 2.9 in.
Vergence correcting.. Convergent lens optical system engineering (C.L.O.S.E)
Even though this is a small binocular there are repeated warnings about the Sun.
Firstly, a diagram and a statement. Do not look at the Sun.
Secondly. Warning. Never attempt to look into the Sun with binoculars.
Thirdly. English. Warning. 1. To avoid serious eye damage, NEVER look at the Sun using the binoculars.
Serious damage to the retina, or total loss of eyesight may occur. (I think that total loss of eyesight is unlikely in any normal circumstances).
2. Do not leave the binoculars in location subject to direct sunlight. Sun rays passing through the binoculars will be intensified, and should they focus on flammable materials, fire may occur.
Safety precautions.
4. Do not swing the binoculars by the neck strap, as there is a danger of hurt person. (I suppose that would hurt my feelings also).