GS Fieldscopes
Developed around an all new optical system featuring objective lens sizes of 66.5mm and 81.5mm plus the option of straight-through or 45° angled viewing, GS Fieldscopes set a new benchmark in affordable lightweight telescopes for birdwatching and general wildlife observation.

All six models in the range aim to meet the three main requirements demanded by today's active Fieldscope user; 'high end' optical performance and value, usability and reliability

**AN EYEPIECE IS REQUIRED AND NOT INCLUDED** Please select one from the range below
 

Brand & Model

Opticron GS815

Opticron GS815/45

Opticron GS665

Opticron GS665ED

Opticron GS665/45

Opticron GS665/45 ED

Telescopes

Price (£) incl VAT

399.00 incl VAT

399.00 incl VAT

299.00 incl VAT

499.00 incl VAT

299.00 incl VAT

499.00 incl VAT

OG Diam (mm)

81.5

81.5

66.5

66.5

66.5

66.5

Min Focus (m)

5.8

5.8

3.8

3.8

3.8

3.8

Features

'High end' optical performance and value
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 revised multi-coating 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.

Models: GS 665 GA · GS 665 GA /45 warrant serious consideration for users wanting optimum size & weight to performance ratios

Models: GS 665 GA ED · GS 665 GA /45 ED afford even greater light transmission and sharper images over 35x (when compared to standard model) plus higher colour fidelity especially noticeable in extreme light conditions. A natural choice for those wanting to experience the 40935 SDL eyepiece, the GS 665 GA ED will perform against the very best.

Models: GS 815 GA · GS 815 GA /45 are the preferred choice for those wishing to maximise light transmission at magnifications over 35x

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.
 
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.

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 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.

Weight (Kg)

1.280

1.280

0.976

1.049

0.980

1.053

Length (mm)

362

362

326

326

326

326

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.

SEE MORE BELOW

Eyepieces Model

SDL Eyepiece
40935

HDF Eyepiece
40810G

HDF Eyepiece
40872G

HDF Eyepiece
40809G

HDF Eyepiece
40858G

HDF Eyepiece
40859G

Telescope Eyepieces

Price (£) incl VAT

229.00 incl VAT

129.00 incl VAT

129.00 incl VAT

149.00 incl VAT

169.00 incl VAT

97.00 incl VAT

Features

SDL EYEPIECE
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.

HDF EYEPIECES
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.
RETRACTABLE TWIST-TYPE EYECUP ASSEMBLY ON MODELS: 40810, 40809, 40872, 40858 & 40862
FOLD-DOWN RUBBER EYECUP ON MODELS: 40859, 48060 & 40861

SEE MORE BELOW

Magnification(665)

16-48x

18xWW

20xWW

25xWW

35xWW

40xW

Magnification(815)

20-60x

23xWW

25xWW

32xWW

44xWW

50xW

Field/1000m (665)

40/22

50

49

47

35

29

Field/1000m (815)

32/18

43

42

36

26

24

EYEPIECES Continued
 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.

SEE MORE BELOW

Eyepieces Model

HDF Eyepiece
40860G

HDF Eyepiece
40861G

HDF Eyepiece
40862G

HR Eyepiece
40812G

HR Eyepiece
40930G

HR Eyepiece
40931G

Telescope Eyepieces

Price (£) incl VAT

97.00 incl VAT

97.00 incl VAT

179.00 incl VAT

57.00 incl VAT

57.00 incl VAT

57.00 incl VAT

Features

HDF EYEPIECES
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.
RETRACTABLE TWIST-TYPE EYECUP ASSEMBLY ON MODELS: 40810, 40809, 40872, 40858 & 40862
FOLD-DOWN RUBBER EYECUP ON MODELS: 40859, 48060 & 40861

Magnification(665)

60xW

80x

16-48x

18x

21xW

27xW

Magnification(815)

80xW

100x

20-60x

23x

27xW

34xW

Field/1000m (665)

19.5

12.5

42/20

46

49

39

Field/1000m (815)

16

8

35/17

38

39

33

EYEPIECES Continued
 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.

Eyepieces Model

HR Eyepiece
40932G

HR Eyepiece
40933G
(Requires 40934 adapter)

Telescope Eyepieces

Price (£) incl VATT

57.00 incl VAT

139.00 incl VAT

Features

HR EYEPIECES
Good choice as either supplementary eyepiece in combination with HDF or single
eyepiece for the more value conscious requiring long eyerelief as all eyepieces offer
full field of view with spectacles.

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

HR EYEPIECES LONG EYERELIEF
RETRACTABLE TWIST-TYPE EYECUP ASSEMBLY ON MODEL 40933
FOLD-DOWN RUBBER EYECUP ON MODELS: 40812, 40930, 40931 & 40932

Magnification(665)

38x

18-54x

Magnification(815)

50x

23-69x

Field/1000m (665)

18

38/20

Field/1000m (815)

15

30/15