Opticron GS 665 - Manual

Telephotography using SLR cameras (digital or film). In this system
the camera lens is substituted for the telescope + telephotoadapter
or telescope + eyepiece + photoadapter. To convert your GS
fieldscope to a 750mm
1 /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 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 +44 (0)1582 726522.
GS Telescopes
User Guide
Models
GS 665 GA
GS 665 GA/45
GS 665 GA ED
GS 665 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. GS6650513