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Korsch

There is an article (well, actually just a stub) by the lemma of Korsch telescope. Probably that stuff should be merged into the three-mirror-anastigmat-article. --BjKa (talk) 23:24, 17 May 2014 (UTC)[reply]

Off-axis three-mirror anastigmat

Hi,

the Paul and Korsch design necassarly put secondary in the optical path obstructing primary mirror, and usually requiring a spider (thus adding diffraction patterns from it) or optical flat (expensive, heavy, and reducing transmission). These problems are sometimes solved by using off axis designs, sometimes called tilted (TCT), like Schiefspiegler, Schupmann Medial Telescope (with Mangin mirror corrector), Schwarzschild-Chang type telescope (design from ~2016), Yolo, and few other designs are around. But I have no idea how they exactly compare to TMA (three-mirror anastigmat like Korsch), in terms of fully correcting spherical aberation, coma, and astigmatism, chromatic aberration, and flat field. Almost all of the mentioned above telescopes (with possibly exception of Schupmann), do not have chromatic aberration due to all reflecting design, and AFAIK no coma, due to non spherical and compensated mirrors. But I have no idea about the astigmatism. Would be nice to find good resources and fill it in. Some of the above designs are using three mirrors, so maybe it is related to this article. 81.6.34.246 (talk)

Revision as of 20:33, 12 January 2020 edit 81.6.34.246 (talk) →Off-axis three-mirror anastigmat: new section ← Previous edit		Revision as of 20:33, 12 January 2020 edit undo 81.6.34.246 (talk) →Off-axis three-mirror anastigmat Next edit →
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	Hi,		Hi,

	the Paul and Korsch design necassarly put secondary in the optical path obstructing primary mirror, and usually requiring a spider (thus adding diffraction patterns from it) or optical flat (expensive, heavy, and reducing transmission). These problems are sometimes solved by using off axis designs, sometimes called tilted (TCT), like [[Schiefspiegler]], Schupmann Medial Telescope (with [[Mangin mirror]] corrector), [[Schwarzschild-Chang]] type telescope (design from ~2016), Yolo, and few other designs are around. But I have no idea how they exactly compare to TMA (three-mirror anastigmat like Korsch), in terms of fully correcting spherical aberation, coma, and astigmatism, chromatic aberration, and flat field. Almost all of the mentioned above telescopes (with possibly exception of Schupmann), do not have chromatic aberration due to all reflecting design, and AFAIK no coma, due to non spherical and compensated mirrors. But I have no idea about the astigmatism. Would be nice to find good resources and fill it in. Some of the above designs are using three mirrors, so maybe it is related to this article.		the Paul and Korsch design necassarly put secondary in the optical path obstructing primary mirror, and usually requiring a spider (thus adding diffraction patterns from it) or optical flat (expensive, heavy, and reducing transmission). These problems are sometimes solved by using off axis designs, sometimes called tilted (TCT), like [[Schiefspiegler]], Schupmann Medial Telescope (with [[Mangin mirror]] corrector), [[Schwarzschild-Chang]] type telescope (design from ~2016), Yolo, and few other designs are around. But I have no idea how they exactly compare to TMA (three-mirror anastigmat like Korsch), in terms of fully correcting spherical aberation, coma, and astigmatism, chromatic aberration, and flat field. Almost all of the mentioned above telescopes (with possibly exception of Schupmann), do not have chromatic aberration due to all reflecting design, and AFAIK no coma, due to non spherical and compensated mirrors. But I have no idea about the astigmatism. Would be nice to find good resources and fill it in. Some of the above designs are using three mirrors, so maybe it is related to this article. [[Special:Contributions/81.6.34.246\|81.6.34.246]] ([[User talk:81.6.34.246\|talk]])