GIOTTO smart flat field generator for telescopes is our most advanced device to record flat frames so you can calibrate your astrophotography pictures. And we designed GIOTTO in order to let you easily connect to different telescopes: that’s why GIOTTO is available in different diameters, starting from 120mm. In this article we show you how to choose the correct GIOTTO dimension for your telescope, based on its diameter, with this simple rule: the illuminated panel diameter of GIOTTO has to be larger than the external tube or dew shield diameter of your telescope.
In this video, Filippo shows you how to choose the correct GIOTTO dimension for your telescope:
In order to choose the correct GIOTTO dimension for your telescope, you have to measure the external diameter of your telescope external tube or dew shield (depending on the telescope type you have) and select a GIOTTO dimension that provides a illuminated panel diameter larger than the measured value of your telescope. For example, GIOTTO285 provides a 285mm diameter illuminated panel so, for example, it’s the perfect fit for a 9.25″ SC telescope that has a front ring external diameter of 270mm.
If you plan to lock GIOTTO in front of your telescope by using the included thumbscrews, after you select the GIOTTO model that better fits your telescope, we also advise you to check that the thumbscrews are are long enough to let you fix GIOTTO on your telescope. This is easy to check by looking at the image with GIOTTO dimensions that we publish in every GIOTTO web page: for example the GIOTTO185 (you can see in the picture below) fits to telescopes with external tube diameter from 147mm to 210mm.