An upgraded, robust pair of waterproof binoculars that are well-suited to stargazing
VITAL STATS
• Price £115
• Optics Fully multi-coated
• Aperture 50mm
• Magnification 10x
• Prisms Porro, BaK-4
• Angular field of view 6°
• Focusing Centre focus
• Eye relief 16mm
• Interpupillary distance 57mm-72mm
• Weight 940g
• Supplier Telescope House
• Tel +44 (0)1342 837098
Bresser’s Corvette 10x50s have been well regarded as a general purpose pair of binoculars for some years. And they have now undergone a thorough ‘makeover’, including significant modernisation, which makes them essentially a new model. When you first take the Corvette 10x50s out of the box, you’ll immediately notice the substantial feel. This is partly due to the weight, at 940g, but a lot of what is plastic on budget binoculars is metal on these. There is a selection of useful extras, including a nylon case, a 25cm-wide neck strap, a pair of tethered lens caps for the objective lenses, a tethered rain guard to protect the eyepieces, a microfibre cleaning cloth and an instruction booklet.
The wide centre-focus wheel and right eyepiece dioptre of the Corvette 10x50s are covered with rubber – with the texture and classy appearance of black-anodised knurled metal – and this allows you to have a good grip with either gloved or bare hands. Along with the central hinge, these parts move smoothly, without any stiff spots. The twist-up eyecups, on the other hand, are quite stiff, but this has an advantage; they don’t have click stops for different positions, but the stiffness means that they will stay put at whatever position you set them. The cups are quite wide, though, so at the minimum interpupillary distance of 57mm (the distance between the pupils of your eyes), there is only 13mm between them, which may be too tight for some broad-bridged noses.
Protected optics
The objective lenses are set back into their cells by 11mm, which offers protection against bumps, while also reducing the likelihood of accidentally touching them. Although the clear aperture is 52mm, this is internally stopped down to an effective aperture of 46mm. This is usually done to sharpen the image at the expense of a slight loss of brightness.
When you shine a light into the objective lens, the reflections you see are consistent with the fully multi-coated specification. Although the objective tubes are ribbed, the entrance to the prism assembly and the prism cages themselves are unblackened, which resulted in some contrast-reducing stray-light scattering when the Moon was on the edge of the field of view. We also used the Moon to test chromatic aberration – an effect usually seen as unwanted coloured rings around brighter objects. It is generally well controlled, with only a small amount visible at the centre of the field of view; even near the edge it was unobtrusive.
The precise focusing system on these binoculars is ideal for astronomy. Our test showed that stars in the middle of the field of view snap to an obvious best focus, but those near the edge are degraded, mostly due to mild field curvature. We were able to keep the components of the double star Albireo (Beta (β) Cygni), with 35 arcseconds separation, split within the central 75 per cent of the field of view. We found that the colour rendition was good in the large sweet spot in the middle of the field of view, but nearer the edge the colours started to become washed out.
Meanwhile, Jupiter showed a distinct disc and all four of its Galilean moons were visible when they were away from the gas giant’s glare.
Views of the deep sky
Binoculars of this size excel on the larger open clusters and asterisms, and this was borne out by the lovely views we had of the Alpha Persei Cluster (Collinder 39) in Perseus, Kemble’s Cascade in Camelopardalis, and Eddie’s Coaster in Cassiopeia.
Looking southwest, we could hold IC 4756 and NGC 6633 in the same field of view and we could appreciate the contrast between these two fine open clusters. Once it rose above the neighbour’s roof, the Andromeda Galaxy, M31, looked magnificent in a crisp, moonless sky, and we could just make out its two faint companion galaxies. Later, we tried the Triangulum Galaxy, M33, but this proved to be more difficult and appeared merely as a small region of slightly brighter sky.
Although these binoculars are quite heavy, at 940g, they’re not uncomfortably so. They have a good balance, especially when you are gazing skywards, so extended hand-held observing stints are possible, especially if you observe while you are reclined.
Overall, the Bresser 10×50 Corvette will appeal to someone who wants a rugged, moderately-priced general-purpose pair of binoculars of decent quality, which will also be very useful for astronomy.
Robust construction
The recent fashion to make binoculars as lightweight as possible comes at the expense of robustness. Fortunately, Bresser has not fallen into this trap with the updated Corvette 10x50s, which retain the rugged characteristics of earlier models. They boast a metal Bausch & Lomb-style body, which means that the prism housing and objective tube is a single casting for each side, so there are no separate objective tubes. The body itself is covered with a 2mm-thick rubber armour, which gives ample protection against everyday use. Many centrefocus binoculars suffer from a rocking eyepiece bridge, which can make them difficult to focus precisely, but this bridge is rock-steady in normal use.
Bresser has also shunned the fashion for having the prisms held in their housings with clips, which leaves them liable to shift at even a slight knock. The prisms of the Corvette 10x50s are held in a proper prism cage, an altogether more robust design.
KIT TO ADD
1. Bresser TR-688V video tripod with two-way tilt
2. Bresser binocular metal tripod adaptor SFM-1
3. Explore Scientific Solarix solar filter film for DIY Sun filters
