I’ve built an aluminum plate for my equatorial mount to allow it to carry the main telescope and the guide scope for autoguiding purposes. In autoguiding, it is important to minimize flexing between the imaging telescope and the guide scope, thus, a plate with suitable thickness helps address this problem. This DIY plate measures 12 cm by 20 cm by 1 cm and made from a solid aluminum plate from a local metals supply shop. Holes have been drilled on the plate to allow attachment of various loads such as DSLR cameras and different telescopes.
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During an exposure, the imaging sensor of a DSLR warms up, resulting to noisy images. By cooling down the sensor, it is possible to eliminate or somehow minimize this thermal noise.
I have made a number of attempts to accomplish this with a Canon 450D and a Peltier module, however, it appears it is very difficult to implement without running into problems such as condensation and frosting.
The Logitech 4000 webcam is capable of imaging planets and can be modified to take long exposure images to serve as a guide camera. The modification requires a serial port to externally control the camera’s exposure time using a guiding software such as GuideMaster and PHD Guiding.
The long- exposure modification allows the camera to detect faint guide stars, which is a useful feature for a guide camera. The diagram shown here was a modified version of M. Burri’s (2002) parallel port interface for a Logitech 3000 which I have adapted to work with the newer Logitech 4000 and a serial port.