GS FIELDSCOPES
'High end' optical performance and value
In keeping with our tradition of fieldscope innovation, the GS series takes the two size model range concept a stage further by increasing the 65mm OG model to a 66.5mm OG model and the 80mm OG model to an 81.5mm OG model without any noticeable gain in size or weight. As a direct result, the GS 815 gains 4% surface area over a standard 80mm OG and GS 665 5% over a 65mm OG. The increase in the amount of light entering the instruments coupled with an all new optical configuration, new prism units and a new multi-coating applied throughout has resulted in a new level of optical clarity in this price segment. Images are extremely bright whilst retaining excellent colour saturation so important for accurate identification.
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GS 815 GA
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'High end' optical performance and value
In keeping with our tradition of fieldscope innovation, the GS series takes the two size model range concept a stage further by increasing the 65mm OG model to a 66.5mm OG model and the 80mm OG model to an 81.5mm OG model without any noticeable gain in size or weight. As a direct result, the GS 815 gains 4% surface area over a standard 80mm OG and GS 665 5% over a 65mm OG. The increase in the amount of light entering the instruments coupled with an all new optical configuration, new prism units and a new multi-coating applied throughout has resulted in a new level of optical clarity in this price segment. Images are extremely bright whilst retaining excellent colour saturation so important for accurate identification.

Terms like 'ease of use' and 'functionality' are all important when using an instrument in field conditions and the GS series is 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 1000g, and the GS 815 under 1300g. 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.

The importance of having access to full range of different magnification eyepieces is also important. As with most Opticron fieldscopes, the GS series are fully compatible with existing Opticron HDF/HR eyepieces including the 40862G HDF zoom 16-48x (665) / 20-60x (815) and 40809 HDF 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 problem 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
815
815/45
665
665/45
Code
40965
40966
40960
40961
OG dia [mm]
81.5
81.5
66.5
66.5
Min Focus [m]
5.8
5.8
3.8
3.8
Length [mm]
362
362
326
326
Weight [g]
1280
1280
976
980
Price £ inc.VAT
399
399
299
299


40965

GS 815 GA/45

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OG diameter: 81.5mm, minimum focus 5.8m, length 362mm, weight 1280g.


40966

GS 665 GA

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OG diameter: 66.5mm, minimum focus 3.8m, length 362mm, weight 976g.


40960

GS 665 GA/45

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OG diameter: 66.5mm, minimum focus 3.8m, length 326mm, weight 980g.


40961

HDF EYEPIECES
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* Twist-up eyecup

For information on focal lengths, weight etc, refer to the main 'Eyepiece' section.

40810(F)

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Has fold-down eyecup for use with 41109 Photo-adapter HDF

GS665   18x   WW    Field 50

GS815    23x  WW    Field 43

40810*

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as for F model

40872*

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GS665   20x   WW   Field 49

GS815   25x  WW    Field 42

40809*

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GS665   25x     Field 47

GS815   32x     Field 36

 

 

 

40858*
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GS665   35x  WW     Field 35

GS815   44x  WW     Field 26

40859 97
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GS665   40x  WW    Field 29

GS815   50x  WW    Field 24

40860

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GS665   60x   WA     Field 19.5

GS815   80x   WA     Field 16

40861

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GS665   80x      Field 12.5

GS815   100x    Field 8

40862*
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GS665   16-48x    Field 42-20

SG815   20-60      Field 35-17

HR EYEPIECES

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* Twist-up eyecup

For info about focal lengths, weight etc, see the main 'Eyepiece' section

40812

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GS665   18x      Field 46

GS815   23x      Field 38

40930

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GS665  21x   WA     Field 49

GS815  27x   WA     Field 39

40931

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GS665  27x   WA    Field 39

GS815  34x   WA    Field 33

40933*

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GS665  18-54x      Field 38-20

GS815   23-89x     Field 30-15