https://borowka.space/en/tags/epsilon/ Recent content in Epsilon on Borówka Observatory Hugo en-US Wed, 31 Dec 2025 00:00:00 +0000 https://borowka.space/en/posts/elephant-trunk-2025/ Wed, 31 Dec 2025 00:00:00 +0000 https://borowka.space/en/posts/elephant-trunk-2025/ <p>Since the beginning of 2025 I have been working on a new wide-field setup — a new telescope, mount, camera, tilter, filters. Thanks to the invaluable help of Kamil Fiedosiuk I managed to resolve a multitude of problems. There are still quite a few issues left to solve, but the equipment finally works!</p> <p>I assembled my first image — the Elephant&rsquo;s Trunk in a wide shot. This dark nebula is located in the constellation Cepheus and lies 2400 light years from Earth. The nebula is surrounded by a much more diffuse region of ionized gas. The photo was taken through Antlia Highspeed Ha, OIII and SII narrowband filters, all 2&quot; in diameter with a 3 nm bandwidth. An interesting fact is that in fast optical systems light enters at a steep angle, causing narrowband filters to lose efficiency due to the transmission band shift, known as bandpass shift. The filters used are the highspeed version, designed for optical systems from F/2.6 to F/3.6, which compensates for bandpass shift effects by shifting the filter passband.</p>