The equipment required to do photometry is basically; a telescope, CCD camera, special filters, plus some software, and a remote focusing motor since the CCD camera, in this case a Canon 60Da, could be 15 feet in the air. My telescope, however, is on an Altitude/Azimuth base mount and therefore requires a de-rotator too, to compensate for field rotation. The Photometry program follows Astrometry in the timeline and so the remote focuser would have already been purchased and installed. However, special filters are required, isolating various portions of the visible electromagnetic spectrum, and a device to remotely move filters into the light path is needed. The filters for photometry have been identified, u' g' r' i' z' SDSS photometric filters, and when $2100 is raised they will be purchased. The device to move filters into the light path will be built behind the focuser, and be USB capable so it can be remotely operated. They do make filter wheels for the CCD camera but it permanently attaches to the camera which is a disadvantage, and, changing a filter wheel to another with different filters is also a disadvantage. I've built the filter slide currently in the telescope behind the focuser. I'll construct another drop-in replacement with an upgrade to be able to easily replace filter holders that are loaded with photometric, nebular, or, planetary filters. This device could cost $200, including the USB motor boards. So a total of roughly $2300 is needed to undertake Photometry plus the cost of the CCD camera. Using the 60Da, it it possible to use the Green Channel which is similar to the V filter.
The color and rotational periods of asteroids.
The rotational periods of binary stars.
Extrasolar planet (Exoplanet) search and discovery.