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#collimation

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rdm<p>One of the real trouble jobs in <a href="https://aus.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>astronomy</span></a> is collimating a reflector telescope. In particular, Maksutov-Cassegrains, like the ETX90, are tricky.</p><p>Fortunately, Escher over Cloudy Nights has posted a really useful guide.</p><p><a href="https://www.cloudynights.com/topic/391392-dont-mess-with-etx-collimation/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">cloudynights.com/topic/391392-</span><span class="invisible">dont-mess-with-etx-collimation/</span></a></p><p><a href="https://aus.social/tags/ETX90" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ETX90</span></a> <a href="https://aus.social/tags/MAK" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MAK</span></a> <a href="https://aus.social/tags/Collimation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Collimation</span></a> <a href="https://aus.social/tags/Telescope" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Telescope</span></a> <a href="https://aus.social/tags/TelescopeMaintainence" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>TelescopeMaintainence</span></a></p>
TomKrajci 🇺🇦 🏳️‍🌈 🏳️‍⚧️<p>How good is my camera lens?</p><p>This is a series of images of an artificial star as seen by a camera lens and digital camera. They range from one side of best focus, through focus, and onto the other side of focus.</p><p>I see two errors:</p><p>1. Collimation/alignment</p><p>2. Astigmatism (probably pinched optics...bad optomechanical support)</p><p>I will disassemble this lens to investigate further.</p><p><a href="https://www.skyatnightmagazine.com/advice/how-to-star-test-a-telescope" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">skyatnightmagazine.com/advice/</span><span class="invisible">how-to-star-test-a-telescope</span></a></p><p><a href="https://universeodon.com/tags/Optics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Optics</span></a> <a href="https://universeodon.com/tags/Testing" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Testing</span></a> <a href="https://universeodon.com/tags/Collimation" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Collimation</span></a> <a href="https://universeodon.com/tags/Astigmatism" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astigmatism</span></a> <a href="https://universeodon.com/tags/Photography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Photography</span></a> <a href="https://universeodon.com/tags/Astrophotography" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Astrophotography</span></a></p>
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