Swift Optics 930 Ultra Lite 10x42
When it comes to the optics, in the binoculars were used BaK-4 glass prisms put in the roof Schmidt-Pechan system. All the elements were covered by new, specially designed multilayer antireflection coatings which are supposed to ensure particularly high transmission. Additionally, the eyepieces are constructed in such a way to have a wide field of view and a comfortable eye relief.
The binoculars are waterproof and come with a 25-year-long guarantee.
- very solid and original casing,
- high transmission,
- very low coma,
- well-corrected astigmatism,
- sharp image in most part of the field,
- slight light fall-off at the edge of the field of view,
- good whiteness rendition,
- sharp image already from 1.35 metres,
- high quality of coatings and prisms,
- long guarantee.
- egg-shaped left pupil,
- high chromatic aberration at the edge of the field of view,
- a bit too high distortion.
It often happens in our tests that real life verifies brutally all the binoculars’ advantages, so touted in promotional brochures by the producer. Taking this truth into account the Swift Ultra Lite surprised us even more pleasantly. Its praised casing is really interesting, original, solid and it sticks out in a positive way against the background of other rivals from the same price segment. New coatings are indeed doing a great job ensuring high transmission. In this price class other producers usually cover prisms with aluminum reflection coatings so their products have the transmission level about 80-85%. The Swift exceeds 90% and it really should be praised for it.
Because of its small dimensions the binoculars have just one serious slip-up, connected with very high chromatic aberration at the edge of the field. Its level was so high that it broke a kind of record among other binoculars in our 10x42 test. In the field centre the aberration stops being so bothersome and even against the background of other competitors the instrument fares quite well.
If we deal with a set of roof prism binoculars with the price tag of 400 USD, one serious slip-up can be forgiven. It is even easier done when we see good or very good results in other categories. We can complain a bit about truncated pupils (although any light losses caused by them are efficiently made up by excellent coatings) and a bit high distortion level.