6.Advance the film and repeat the process.
Lunar Phase | ISO 50 | ISO 100 | ISO 200 | ISO 400 |
Crescent | 1/2 | 1/4 | 1/8 | 1/15 |
Quarter | 1/15 | 1/30 | 1/60 | 1/125 |
Full | 1/30 | 1/60 | 1/125 | 1/250 |
Table
Above is a listing of recommended exposure times when photographing the Moon at the
prime focus of your telescope.
The exposure times listed in table
•If using black and white film, try a yellow filter to reduce the light intensity and to increase contrast.
•Keep accurate records of your exposures. This information is useful if you want to repeat your results or if you want to submit some of your photos to various astronomy magazines for possible publication!
•This technique is also used for photographing the Sun with the proper solar filter.
Terrestrial Photography
Your telescope makes an excellent telephoto lens for terrestrial (land) photography. Terrestrial photography is best done will the telescope tracking drive turned off. To turn the tracking drive off, press the MENU (9) button on the hand control and scroll down to the Tracking Mode sub menu. Use the Up and Down scroll keys (10) to select the Off option and press ENTER. This will turn the tracking motors off, so that objects will remain in your camera's field of view.
Metering
The Advanced Series telescope has a fixed aperture and, as a result, fixed f/ratios. To properly expose your subjects photographically, you need to set your shutter speed accordingly. Most 35mm SLR cameras offer
Reducing Vibration
Releasing the shutter manually can cause vibrations, producing blurred photos. To reduce vibration when tripping the shutter, use a cable release. A cable release keeps your hands clear of the camera and lens, thus eliminating the possibility of introducing vibration. Mechanical shutter releases can be used, though
Blurry pictures can also result from shutter speeds that are too slow. To prevent this, use films that produce shutter speeds greater than 1/250 of a second when
Another way to reduce vibration is with the Vibration Suppression Pads (#93503). These pads rest between the ground and tripod feet. They reduce the vibration amplitude and vibration time.
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