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<blockquote data-quote="STM" data-source="post: 752596" data-attributes="member: 12827"><p>Not a major purchase, but I did score a great deal on a TC-201 in near mint condition for about $50. I plan on putting it on my 500mm f/8 Reflex Nikkor, which is in essence a short Schmidt-Cassegrain telescope, to use for astrophotography. Some test photos taken today show essentially no degradation of IQ and practically no vignetting, something I had read might happen. I have to use this one instead of my TC-300 because that one is for use with long telephotos with deeply recessed rear elements. The front elements of the TC-300 actually protrude through the mount into the rear of the prime lense, The 500mm f/8's rear elements are very near the mount so it will not work. Deep Sky Tracker uses "flats" frames to compensate for any vignetting so it would not be an issue anyway. </p><p></p><p>[ATTACH]351970[/ATTACH]</p></blockquote><p></p>
[QUOTE="STM, post: 752596, member: 12827"] Not a major purchase, but I did score a great deal on a TC-201 in near mint condition for about $50. I plan on putting it on my 500mm f/8 Reflex Nikkor, which is in essence a short Schmidt-Cassegrain telescope, to use for astrophotography. Some test photos taken today show essentially no degradation of IQ and practically no vignetting, something I had read might happen. I have to use this one instead of my TC-300 because that one is for use with long telephotos with deeply recessed rear elements. The front elements of the TC-300 actually protrude through the mount into the rear of the prime lense, The 500mm f/8's rear elements are very near the mount so it will not work. Deep Sky Tracker uses "flats" frames to compensate for any vignetting so it would not be an issue anyway. [ATTACH=CONFIG]351970._xfImport[/ATTACH] [/QUOTE]
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