Opticron GS 52 GA ED User manual

Telephotography using SL cameras (digital or film). In this system
the camera lens is substituted for the telescope + telephotoadapter
or telescope + eyepiece + photoadapter. To convert GS 52 ED
models to a 530mm1/f.10 telephoto lens you will need a 40215
telephotoadapter. Alternatively connect a suitable push fit
photoadapter to your viewing eyepiece.2A T-mount is required to
connect the assembly to the camera body.
otes. Focusing is facilitated on the telescope. 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 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.opticron.co.uk
Digi-scoping with digital compact cameras and camcorders
Shooting high magnification photos and video through your telescope is possible if you have a suitable
camera or camcorder. To find out how suitable or not your camera 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 camera a few mm
away from the eyelens of the eyepiece and increase the zoom to get a full frame image.
The most suitable 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 telescope 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.opticron.co.uk or contact Sales on [phone].
GS Telescopes
User Guide
Models
GS 52 GA ED
GS 52 GA ED/45
Telephotography
Camera body 1. Telephotoadapter or
2. Photoadapter +
eyepiece (inside)
T-mount
Opticron, Unit 21, Titan Court, Laporte Way, Luton, Beds LU4 8EF UK.
© Opticron 2013. All equipment and specifications illustrated are subject to change without prior notification. GS52ED0513

Getting Started
Your GS telescope will open up a whole range of new and exciting
impressions, whether for general use or specialist study. To focus at
different distances, simply turn the main focus wheel in
conjunction with the 9:1 ratio accurate focus adjuster until the
image being viewed becomes sharp. To minimise image shake
caused by high magnification the instrument should be supported
using a suitable tripod or mount connected via the tripod socket
located on the tripod sleeve. If the eyepiece being used has a fold
down or retractable rubber eyecup it 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.
Care & Cleaning
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 guarantee.
WA NING. ever under any circumstances use a telescope to view the sun. Doing so will cause serious damage to
your eyes.
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.
Waterproof Cases
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 (angled models only). As Black models but supplied
with a fully adjustable neoprene carry strap for extra comfort.
Eyepiece
Rotating sleeve
and tripod socket
Main focus wheel
Objective
lens
9:1 ratio
accurate focus
adjuster
* 40934G eyepiece adapter required
Specifications 52ED 52ED/45
Product Code 40956 40957
OG Dia (mm) 52 52
Min Focus (m) 2.5 2.5
Length (mm) 200 200
Weight (g) 754 759
EYEPIECES • SDLv2 • HDF • H /H 2
Product Code 40936G 40810G 40809G 40858G 40860G 40861G 40862G 40930G 40931G 40933G*
Magnification 12-36x 13xWW 18xWW 24xWW 45xWA 57x 12-36x 15xWA 20xWA 13-39x
Field/1000m 60/36 75 66 49 43 20 62/29 74 59 52/30
Eyerelief (mm) 20-18 22 18 17 15 16 22-17 18 17 18-14
Specifications & Eyepieces