Opticron HR ED - Manual (Page 5)

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 HR fieldscope into a telephoto lens (HR 66
800mm
1 /f.12, HR 80 900mm 1 /f.11.3), 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.
Telephotography
Camera body 1. Telephotoadapter or
2. Photoadapter +
eyepiece (inside)
T-mount