The Askar FMA 230 is a professional astronomical optics system consisting of a three-element lens and a four-element focal length reducer. Due to its modular structure, the astrograph can be used both in astrophotography and during visual observations. The lens of the Askar FMA 230 system is an apochromatic triplet with an air gap, characterized by an excellent correction of chromatic aberrations thanks to the use of two elements made of low dispersion glass (ED). The lens works with a four-element reducer and when connected it is possible to shoot at a focal length of 230 mm and the aperture of f / 4.6. This instrument can also be successfully used for visual observations. For this purpose, after disconnecting the reducer, one should mount the included adapter, which enables the connection of two-inch glasses or angle adapters. The set is complemented by precisely made mounting clamps with a solid Vixen foot, used to embed the astrograph in the assembly. Due to the special design of the Askar FMA 230 accessory socket, it can also be mounted on a classic photographic tripod equipped with an Arca-Swiss connector.
The most important features of the Askar FMA 230 astrograph
• apochromatic triplet with an air gap and two low-dispersion elements designed for astrophotography and visual observations • four-element 0.83x focal length reducer • a two-inch adapter for attaching an eyepiece for visual observations • accessory rail with dovetail socket, compatible with the Arca-Swiss standard
• optical design of the lens: APO ED triplet with air gap • number of ED glass elements: two • optical construction of the focal length reducer: quadruplet • focal length reducer: 0.84x • aperture: 50 mm • focal length (without reducer): 275 mm • focal length (with reducer): 230 mm • light shone (without reducer): f / 5.5 • light shone (with reduction reduction): f / 4.6 • back focus: 55 mm (from the end of the M48 thread) • focus adjustment: helical focuser • mounting for assembly: Vixen foot • tripod mount: Arca-Swiss • accessory mount: Vixen socket • camera / camcorder mount: M48x0.75 thread • adapter for visual observations: 2 " • length with reducer (for astrophotography): 248 mm • length without reducer (for visual observation): 221 mm • weight: 1045 g
Elements of the set
• Askar FMA 230 astrograph • fastening rings • Vixen footer • accessory rail • adapter 2 " • documentation