GS 665 Fieldscopes
GS 665 GA
Discontinued January 2016
Introduced in response to demand for high quality lightweight waterproof telescopes the Opticron GS 665 series set the standard for people wanting to take-out and walk-about with their equipment whether for birdwatching or general wildlife observation. Available in straight-through or 45°, the models are designed and manufactured to meet the three main requirements demanded by today's active fieldscope user: high-end optical performance, usability and reliability.
'High end' optical performance and value
The GS 665 uses a 66.5mm dia objective lens without any noticeable gain in size or weight over a 65mm. With a 5% more light entering the telescope, more light is emitted, resulting in brighter images compared to a standard 65mm throughout the magnification range. 100% designed and manufactured in Japan using high quality glass and other materials, each GS 665 produces high resolution images with minimal edge distortion and accurate color reproduction.
The GS 665 is designed to provide class winning optical performance seamlessly in even pretty harsh conditions. Protected by full body natural rubber armour, the centrally positioned focusing wheel allows easy access for both right and left handed users and is rubber covered to deliver 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 with close focus set at 4m. Housed within the same mechanism is a 9:1 ratio focus adjuster, providing greater focusing accuracy at top end magnifications.
More often than not, telescopes need to be tripod mounted for image stability so any weight saving is crucial. Constructed to be as light as possible, the standard GS 665 weighs less than 1kg (w/o eyepiece) and as a result can be used comfortably on a standard ‘non fluid’ panhead often found on Clamps or Travel Tripods. In addition each GS is fitted with a -/+ 90° rotating die-cast alloy tripod sleeve with 45° incremental 'stops'. This feature enables the scope to rotate around its’ central axis for accurate positioning when mounted to a bipod or on a clamp in a Hide or Blind. To avoid problems of reflected light on the objective lens in bright sunlight models are fitted with a retractable lens hood with integrated objective lens cover.
Having access to full a range of eyepieces is also important. The GS 665 series are fully compatible with Opticron SDL and HDF T eyepieces including the 40862G HDF T 16-48x and 40809G HDF T 25xWW.
Extensively tested for continuous trouble free use in varying temperatures, the models are fully nitrogen gas filled waterproof and come with the assurance of a 30 year guarantee.
OG dia (mm)
Min Focus (m)
Price £ inc. VAT
|40195||GS 665 GA + HDF T 16-48x + WP Case||563.00||379.00*||184.00|
|40196||GS 665 GA/45 + HDF T 16-48x + WP Case||563.00||379.00*||184.00|
*SRP £ Jan 2016
A wide range of eyepieces are available for Opticron fieldscopes. Choosing the best one is often confusing but making the right choice will depend on price and application. It is important you remember the eyepiece is an integral part of the system and choosing a lower quality lens will affect overall image quality.
SDL v2 Eyepiece CLICK FOR IMAGE
5-group, 8-element ‘super’ zoom, the SDLv2 offers superior cross-field definition with exceptional viewing comfort. Waterproof and fitted with a rotating eyecup. Supplied in soft padded case. 10 year guarantee.
Price £ inc. VAT
HDF Eyepieces CLICK FOR IMAGES
High definition eyepieces with long eye relief. Fixed magnification models are wide angle (except 40861). Models marked (*) feature alloy twist type retractable eyecup. 10 year guarantee.
Price £ inc. VAT
HR Eyepieces CLICK FOR IMAGES
Designed for the value conscious user wanting long eye relief. 40933 HR2 zoom features twist type eyecup. 5 year guarantee.
Price £ inc. VAT
(1) Requires 40934 adapter to connect to telescope body
Stay-on-the-Scope Waterproof in Black
Water resistant multi-layer padded cases individually designed to fit each model. Protects instrument while fitted to a tripod and in use. Includes removable end caps and adjustable carry strap.
Stay-on-the-Scope Waterproof in Green (angled models only).
As Black models but supplied with a fully adjustable neoprene carry strap for extra comfort.
|Code||Model||Price £ inc. VAT|
|GS 665 GA (65) Black
GS 665 GA / 45 (66) Black
GS 665 GA / 45 (66G) Green
Telephotography is easier than ever to enjoy using Opticron spottingscopes in combination with a wide range of imaging devices. CLICK HERE for more information on telephotography with GS scopes.
CLICK HERE for information on Storage cases and Eyepiece cases
CLICK HERE for information on Tripods and Mounts
CLICK HERE for information on the 2.5x Universal Tele-adapter for SDL, HDF and HR eyepieces