Opticron GS 665 GA ED, GS 665 GA ED/45 User Instructions

Telephotography using SLR cameras (digital or film) and compact
system cameras. In this system the camera lens is substituted for

the fieldscope + telephotoadapter or fieldscope + eyepiece +
photoadapter. To convert GS 665 ED models to a 750mm1/f.11.3
telephoto lens you will need a 40215 telephotoadapter.
Alternatively connect a suitable push fit photoadapter to your
viewing eyepiece.2 A T-mount is required to connect the assembly
to the camera body.

Notes. Focusing is facilitated on the fieldscope. Camera may need to be
operated in manual mode with shutter locks disengaged where necessary. The
high magnification to aperture ratios result in slower shutter speeds compared
with conventional telephoto lenses so choose an IS0 setting of 400. For
35mm SLRs 400 ASA film is recommended. If possible use a cable release or
remote control to reduce camera shake when operating the shutter.

1

This is an approximate figure based on 35mm SLR cameras. D-SLR/compact system cameras use different sized image sensors compared to
35mm so an equivalent telephoto conversion figure must be calculated separately.

2

For information on push fit photoadapters visit our Telephotography pages at www.opticronusa.com

Digi-scoping with digital compact cameras, camcorders and cell phones.

Shooting high magnification photos and video through your fieldscope is possible if you have a suitable camera, camcorder

or cell phone. To find out how suitable or not your device is for digi-scoping, position it up to the
viewing eyepiece and see if an image appears on the screen. You may have to position the unit a few
mm away from the eyelens of the eyepiece and increase the zoom to get a full frame image.

The most suitable compact cameras are those with a lens diameter of 20mm or under and zoom range
no greater than 5x. To get the best results you will also need to fit a low magnification wide angle
eyepiece to your fieldscope or use a zoom eyepiece set at minimum.

To find out more about bespoke digi-scoping kits and universal mounts and brackets visit the Telephotography pages at www.opticronusa.com or
contact Sales on [phone].

Address: Opticron LLC, 16501-D Northcross Drive, Huntersville, NC 28078

Tel: [phone] Fax: [phone] Email: sales@ opticronusa.com

Waterproof Cases Telephotography

Care & Cleaning

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*

As black models but supplied with a fully adjustable
neoprene carry strap for extra comfort.

*Angled models only.

To clean outer glass surface of the eyepiece and objective lens, gently remove excess dirt and dust using a
compressed air device or blower brush. Caution. Hard and persistent rubbing of dirty surfaces can cause abrasive
scratches on the surface of the glass which may distort viewing. Breathe on exposed glass surface and then wipe
with an optical cleaning cloth (code 30277) in a circular motion until the surface is clean again. Do not attempt to
dismantle the instrument as this will invalidate the warranty.

Whenever possible store in a stable dry atmosphere away from moisture. For extra protection, use the gift box or
one of the optional cases available.

GS Fieldscopes

User Instructions and Warranty

North America

GS665EDUSA0614

Models

GS 665 GA ED

GS 665 GA ED/45

Camera body

T-mount

1. Telephotoadapter or

2. Photoadapter +
eyepiece (inside)

Getting Started

Specifications & Eyepieces

Your GS fieldscope will bring a new dimension to long range observation bringing far away subjects into clear and
sharp focus.

1. To minimize image shake caused by the high magnification, the instrument should be supported using a suitable
tripod or mount.

2. Connect the fieldscope to the tripod or mount using the tripod socket located on the underside of the tripod sleeve.

3. Make sure the eyepiece is attached securely. The retractable rubber eyecup should be used in the down position
when wearing glasses. This ensures the maximum available field of view is obtained. Be sure to return the
eyecup to the up position if you or anybody else wants to view without glasses.

4. To focus, locate the subject in the center of the field of view and rotate the focus wheel until the subject comes
into sharp focus. At high magnifications when depth of focus is shorter use the fine focus adjustment for greater
accuracy.

5. If you are using a variable magnification or zoom eyepiece set the magnification to minimum when trying
to locate your subject, only zooming once the subject is centered. With some eyepieces a small amount of
refocusing may be required as the zoom is adjusted.

6. The retractable lens hood should be extended when viewing in bright sunlight.

WARNING. Never under any circumstances use a fieldscope to view the sun. Doing so will cause serious damage to your eyes.

Warranty

Please keep this Warranty Card in a safe place

Model: ........................................................................................................................................................................

Serial No: ................................................................. Purchase Date: ...................................................................

Dealer ........................................................................................................................................................................

Opticron GS fieldscopes are of a very high quality both in their performance and construction and for your peace
of mind we offer a Premier Plus Limited Lifetime Warranty.

The Premier Plus Limited Lifetime Warranty covers all the optical and mechanical components a s well as the
outer protective armor, but not accessories such as dust caps, objective lens covers etc. which are covered by our
Standard Warranty.

In the case of accidental damage or defec ts attributable to faulty par ts or assembly we will assume responsibility
for the full costs of repair up to 5 years from the date of purchase. We reserve the right to decide whether defective
parts or produc ts should be repaired or replaced.

For the next 15 years your product is covered for defec ts attributable to faulty par ts or assembly and we will assume
responsibility for those costs only, charging labor costs to carry out the repair.

The Premier Plus Limited Lifetime Warranty does not cover loss, thef t or deliberate damage to the instrument.

Registration

It is important you register your new purchase to activate your Premier Plus Limited Lifetime Warranty. To register
your product and activate the warranty plea se visit www.opticronusa.com/register and complete the form.

Premier Plus Limited Lifetime Warranties are available on new instruments purchase d from participating dealers in
North America and are transferable. If you part with your instrument please make sure the new owner has a copy
of your original proof of purchase and re-registers t heir ownership at: www.opticronusa.com/re gister

Privacy

Opticron takes your privacy seriously and we do not share pers onal information with other companies.

Main Features

A Interchangeable eyepiece

(not included).

B Main focus wheel.

C 9:1 fine focus wheel.

D Tripod sleeve with +/- 90˚

rotation and large footprint
tripod adapter socket with
1/4” thread.

E Retractable lens hood.

A

B

D

C

Integrated rubber objective
lens cover.

E

Specifications 665 ED 665 ED/45

Code
Objective (mm)
Close Focus (ft/m)
Length (in/mm)
Weight (oz/g)

40962

66.5

12.5/3.8

12.8/326

37.0/1049

40963

66.5

12.5/3.8

12.8/326

37.1/1053

Eyepieces • SDLv2 • HDF

Code
Magnification
Field (ft/1000yd)
Field (m/1000m)
Eyerelief (mm)

40936G

16-48x
123/75

41/25
20-18

40810G
18xWW

150

50
22

40809G
25xWW

141

47
18

40858G
35xWW

105

35
17

40862G

16-48x
126/60

42/20
22-17