Exposure Control Commands

The following commands can be used to modify an ongoing exposure:

• pause - Pause the exposure e.g. while waiting out passing clouds.

• resume - Resume a paused exposure.

• tchange - Change exposure time. You will be prompted for the amount by which to change the exposure which may be positive or negative. If used during a sequence the duration of the present exposure and all subsequent exposures is changed.

• stop - Stop the exposure early, read out the CCD and save the data to disk. If used during a sequence, the sequence is also terminated.

• abort - Abort the exposure. The CCD is not read out and any data collected during the exposure is irrevocably lost. If used during a sequence, the sequence is also terminated. Note that, currently, abort does not work properly. Hence the abort command has temporarily been made synonymous with stop. This has the unfortunate consequence that you will have to wait for an aborted exposure to finish reading out before you can continue.

• pictitle - If when entering the title you typed M31 when you meant M33 you can use this command to give your image a new title.