GS FIELDSCOPES
GS 815 GA · GS 665 GA · GS 665
GA ED · GS 815 GA ED |
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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.
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'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.
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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.
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Usability
'Ease of use' and 'functionality' are all important when
using an instrument in the field and the GS series is
designed to provide class winning optical performance
seamlessly in an array of different outdoor conditions. |
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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.'
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Models: GS 665 GA · GS 665 GA ED
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Models: GS 665 GA /45 · GS 665 GA ED /45
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Models: GS 815 GA · GS 815 GA ED |
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Models: GS 815 GA /45 · GS 815 GA ED/45 |
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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.
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SPECIFICATIONS |
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Specifications |
815 ED
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815 ED/45
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815
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815/45
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665
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665/45
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665 ED
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665/45 ED
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Code |
40967
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40968
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40965
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40966
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40960
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40961
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40962
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40963
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OG dia [mm] |
81.5
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81.5
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81.5
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81.5
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66.5
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66.5
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66.5
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66.5
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Min Focus [m] |
5.8
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5.8
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5.8
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5.8
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3.8
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3.8
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3.8
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3.8
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Length [mm] |
362
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362
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362
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362
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326
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326
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326
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326
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Weight [g] |
1349
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1353
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1280
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1280
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976
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980
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1049
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1053
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Price £
inc.VAT |
499
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499
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349
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349
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299
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299
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449
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449
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EYEPIECES |
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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.
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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.
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Eyepiece Code
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40935
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Magnification [665]
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16-48x
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Magnification [815] |
20-60x
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Field/1000m [665]
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40/22
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Field/1000m [815]
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32/18
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Price £
inc.VAT
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229
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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. |
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Eyepiece Code |
40810G*
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40872G*
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40809G*
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40858G*
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40859G
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40860G
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40861G
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40862G*
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Magnification [665] |
18xWW
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20xWW
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25xWW
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35xWW
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40xW
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60xW
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80x
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16-48x
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Magnification [815] |
23xWW
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25xWW
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32xWW
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44xWW
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50xW
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80xW
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100x
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20-60x
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Field/1000m [665] |
50
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49
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47
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35
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29
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19.5
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12.5
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42/20
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Field/1000m [815] |
43
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42
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36
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26
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24
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16
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8
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35/17
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Price £
inc.VAT |
129
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129
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149
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169
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97
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97
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97
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179
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*Twist-type eyecup
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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.(2)
HR eyepiece 40812 can be used as both a viewing lens as well
as being an option in
providing the eyepiece part of the 41109
Photoadapter+eyepiece combination option for
SLR Photography. |
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Eyepiece Code |
40812G
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40930G
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40931G
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40932G
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40933G* (2)
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Magnification [665] |
18x
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21xW
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27xW
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38x
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18-54x
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Magnification [815] |
23x
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27xW
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34xW
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50x
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23-69x
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Field/1000m [665] |
46
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49
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39
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18
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38/20
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Field/1000m [815] |
38
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39
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33
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15
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30/15
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Price £
inc.VAT |
57
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57
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57
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57
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139
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[*Twist-type eyecup]
(2) Requires 40934 adapter to connect
to telescope body |
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TELEPHOTOGRAPHY |
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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. |
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CLICK HERE to view photos
taken with the GS 665 GA + Samsung i6 camera kit |
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CLICK
FOR
TELEPHOTOGRAPHY USING DIGITAL
COMPACT CAMERAS / CAMCORDERS
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CLICK FOR
TELEPHOTOGRAPHY
USING D-SLR/SLR CAMERAS |
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ACCESSORIES |
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For more information on accessories available for GS models
including:
• Waterproof cases, Traveller carry cases and Eyepiece
pouches, see:
Accessories
• Tripods and Mounts see:
Tripods and
Mounts
• 2.5x Universal Tele-adapter for SDL, HDF and HR eyepieces
see:
UTA
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