The models are designed and manufactured to meet the three main requirements demanded by today's active fieldscope user; 'high end' optical performance and value, usability and reliability.
'High end' optical performance and value
The GS series takes the two size model range concept on a stage by increasing the 65mm OG model to a 66.5mm without any noticeable gain in size or weight. As a direct result, the GS 665 GA 5% over a 65mm OG. The increase in the amount of light entering the instruments results in significantly higher levels of optical clarity over preceding models. Images are extremely bright whilst retaining excellent colour saturation so important for accurate identification.
For optimum size & weight to performance ratios, the GS 665 GA warrants serious consideration for users choosing either zoom or fixed magnification eyepiece options.
Usability
'Ease of use' and 'functionality' are all important when using an instrument in the field and the GS series are designed to provide class winning optical performance seamlessly in an array of different outdoor conditions.
As telescopes need to be used with a solid tripod for image stability, any weight saving is crucially important. Constructed using lightweight materials where at all possible, the GS 665 weighs under 1060g.
GS Fieldscopes are protected by 'full body' natural rubber armour with a textured finish to the top half of the main body prism housing. The centrally positioned focusing wheel allows easy access for both right and left handed users and is also rubber covered - delivering a positive feel with or without gloves.
The focusing system is designed to allow adjustment from infinity to 50 metres in just a 270° turn. Housed within the same mechanism for convenience is a 9:1 ratio accurate focus adjustment.
Designed to enable rotation around the main axis of the instrument for use on a bipod or in a hide with a high window, GS fieldscopes feature a solid die-cast tripod sleeve with -/+ 90 degrees each-way action with 45° incremental 'stops'.
To avoid problems of reflected light on the objective lens in bright sunlight all models are fitted with a retractable lens hood extending 28mm (665) and 40mm (815).
Reliability
Extensively tested for continuous trouble free use in varying temperatures, the models are fully nitrogen gas filled and waterproof and come with the assurance of a 30 year guarantee.