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The guide telescope is extremely necessary when doing astrophotography, the UltraGuide MKII is a telescope with a focal length of 120mm for a ratio of F / 4.0, ideal for instruments with medium or short focal length. The 31.8mm focuser allows you to use the UltraGuide MKII both as a finder and as a guide telescope, in fact it is equipped with a T2 thread to allow attachment to most of the guide cameras on the market.
Artesky introduces the new line of APO ED refractors, the new 80mm doublet with 2 element objective, the first is a FCD1-B Ohara (Japan) element while the second is a Lanthanum element. It is possible to reduce it with a factor of 0.8x and bring it to a focal length of 450mm with factor F/5.6 or use it at full focal length with the 1x variable field flattener.