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ASTROPHOTOGRAPHY
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5
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FRONT PAGE
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EYEPIECE PROJECTION
CAMERA PHOTOS
FILM PROCESSING Cont'd.
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CONTENTS
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- using a piece of cardboard over the lens of the camera before opening the shutter and
then removing the cardborad will stop the camera and telescope
moving, caused by
pushing the button for exposure. Putting the cardboard back over the lens to end the exposure
will stop the movement when closing the shutter
of the camera again. As long as no light
enters the camera while the cardboard is covering the lens, no mistakes by bumping will
show up on the image. The use
of shutter release cables can minimise the movement,
but they can still pull at the camera when used.
- Eyepieces have threads in the bottom of them for different filters and reticles to be screwed
in. A reticle which has cross hairs are used as guides to
keep the star your tracking more
accurately centered in the eyepiece.
- The lens of a camera will be the first thing which will get fogged up on those dewy nights.
A ring of cardboard to extend the lens of the camera will help
reduce the dewing effect.
- Some filters can be purchased, which are actually just coloured glass, for a minimal
amount of money. These can change the effect of the photographs
greatly by enhancing
some objects. A professional set of filters which cut out different wave lengths of light
are used to bring out different colours in the
photographs. Expect to pay around $200
for a set of 5 or so.
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PROCESSING CAMERA PHOTO FILM
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One hour processing is fine for developing your photos but, always include a photo of
something bright every 3 or 4 shots. This will give a reference
point as when looking at
the film to be developed, the borders of the night sky shots cannot be seen clearly. It's
possible your photos will be cut straight
through the center because it appears as though
there is nothing there to the developer. This problem can also be be cured by mounting
the photographs yourself,
as slides. It's a good idea let the developer know what's on
your film. Sometimes when the pictures are developed by some processors, the background
is not
made black as the machine operator can choose the tint themselves.
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FRONT PAGE
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CONTENTS
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END OF ASTROPHOTOGRAPHY SECTION
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Contact Us - telescopes@adam.com.au
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