Digital Indicator permits indexing exact focus position for CCD photography. Kit fits all Tele Vue telescopes with 2.4" focusers. Digital indicator reads with 10 micron accuracy, has 0.5" motion range and accepts RS-232 output cable for displaying readout on computer. TVFocus software (freeware) displays digital indicator reading on computer display through Indicator to computer RS232 cable (RSC-2320).