GS FIELDSCOPES
GS 665 GA, GS 665 GA ED, GS 815 GA, GS 815 GA ED
Introduced in response to growing demand for quality lightweight nitrogen waterproof telescopes and developed around an optical system featuring objective lens sizes of 66.5mm and 81.5mm, GS fieldscopes set the standard for customers wanting to take-out and walk-about with their equipment whether pursuing birdwatching or general wildlife observation.
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 and the 80mm OG model to an 81.5mm without any noticeable gain in size or weight. As a direct result, the GS 815 GA gains 4% surface area over a standard 80mm OG and 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.
Which model?
For optimum size & weight to performance ratios, the GS 665 GA warrants serious consideration for users choosing either zoom or fixed magnification eyepiece options. The GS 815 GA models are the preferred choice for those wishing to maximise light transmission at magnifications between 35x and 60x with either one of the three zoom eyepiece options available. The 665/815 ED models afford the size and weight conscious user extra light gathering capability, improved definition at magnifications over 35x plus higher colour fidelity when compared to the standard models. A natural choice for those wanting to experience either the 40862 HDF T zoom or the 40935 SDL zoom eyepieces.
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, and the GS 815 under 1360g. In addition, model GS 815 is perfectly balanced on a tripod when fitted with any HDF eyepiece to eliminate 'drop forward' syndrome common place with many large objective telescopes.
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.
Having access to full range of different magnification eyepieces is also important. The GS series are fully compatible with Opticron SDL, HDF & HR eyepieces including; 40862G HDF T 16-48x (665) / 20-60x (815) 40809 HDF T 25xWW (665) / 32xWW (815).
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.
SPECIFICATIONS
| Specifications | 665 | 665/45 | 665 ED | 665 ED/45 | 815 | 815/45 | 815 ED | 815 ED/45 |
|---|---|---|---|---|---|---|---|---|
| Product Code OG dia (m) Min Focus (m) Length (mm) Weight (g) Price £ inc. VAT |
40960 66.5 3.8 326 976 299 |
40961 66.5 3.8 326 980 299 |
40962 66.5 3.8 326 1049 499 |
40963 66.5 3.8 326 1053 499 |
40965 81.5 5.8 362 1280 369 |
40966 81.5 5.8 362 1280 369 |
40967 81.5 5.8 362 1349 549 |
40968 81.5 5.8 362 1353 549 |
EYEPIECES
A wide range of eyepieces are available for use with GS Fieldscopes. Choosing the best eyepiece is often confusing but making the right choice will depend on price and application. It is important to remember that the eyepiece is an integral part of the whole set-up and opting for a lower quality lens will make a difference to the overall image quality derived from the fieldscope.
SDL EYEPIECE CLICK FOR IMAGE
An F24 - F8, 5-group 8-element 'super' zoom, the 40935 SDL has been designed to maximise the performance gains inherent in Opticron ED objective lens fieldscopes at higher magnifications. Offering an optimum ratio between field of view and resolution, the main viewing characteristics of the SDL eyepiece are superior cross-field definition at all magnifications coupled with exceptional viewing comfort. Mechanically the eyepiece is waterproof, uses the M41.5 collar thread attachment, features a 90° rotation between high and low magnification settings plus a rotating eyecup that can be positioned to match individual needs. Supplied in soft padded case.
| Eyepiece Code | 40935G |
|---|---|
| Magnification (665) Magnification (815) Field/1000m (665) Field/1000m (815) Price £ inc. VAT |
16-48x 20-60x 40/22 32/18 229 |
HDF EYEPIECES CLICK FOR IMAGES
The preferred choice for quality and viewing comfort, HDF eyepieces have large dia. eyelenses and provide 'walk-in' field of vision. All eyepieces feature long eyerelief for full field of view with or without spectacles and fixed magnification models are wide angle. Eyepieces in table marked * have a twist-type eyecup.
| Eyepiece Code | 40810G* | 40809G* | 40858G* | 40859G | 40860G | 40861G | 40862G* |
|---|---|---|---|---|---|---|---|
| Magnification (665) Magnification (815) Field/1000m (665) Field/1000m (815) Price £ inc. VAT |
18xWW 23xWW 50 43 129 |
25xWW 32xWW 47 36 149 |
35xWW 44xWW 35 26 169 |
40xWA 50xWA 29 24 99 |
60xWA 80xWA 19.5 16 99 |
80x 100x 12.5 8 99 |
16-48x 20-60x 42/20 35/17 189 |
HR EYEPIECES CLICK FOR IMAGES
Good choice as either supplementary eyepiece in combination with HDF or single eyepiece for the more value conscious requiring long eyerelief. HR 40933 zoom eyepiece is an excellent choice for 665 models giving 18-54x. Eyepieces in table marked * have a twist-type eyecup.
| Eyepiece Code | 40812G | 40930G | 40931G | 40932G | 40933G*(1) |
|---|---|---|---|---|---|
| Magnification (665) Magnification (815) Field/1000m (665) Field/1000m (815) Price £ inc. VAT |
18x 23x 46 38 57 |
21xWA 27xWA 49 39 57 |
27xWA 34xWA 39 33 57 |
38x 50x 18 15 57 |
18-54x 23-69x 38/20 30/15 139 |
(1) Requires 40934 adapter to connect to telescope body
TELEPHOTOGRAPHY
Telephotography, (taking high magnification photographs) is now easier then ever to enjoy using Opticron telescopes in conjunction with either D-SLR / SLR cameras, digital compact cameras or camcorders. CLICK HERE for more information on telephotography with GS scopes.
ACCESSORIES
CLICK HERE for information on Waterproof cases, Traveller carry 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
