Quote:
Originally Posted by anthony.tony
What does Equiiberated mean.
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Tony, by saying equilibrated I'm sure Mark is talking about getting your mirror to the same temperature as the air just above it in the tube. Usually this means cooling the mirror (thermal mass, retaining the daytime heat) down to the (usually dropping) air temperature. This is where the fan attached to the end of the scope comes in. Get it on as soon as you are set up. Many leave it running through-out the session, believing that the air movement helps prevent dew formation on the primary and secondary mirrors. Check at high magnification, however, if your particular fan is inducing any vibration affecting the image you are observing. If any, it seems to be minor in most cases.