ap gto그룹에 소개된 18인치 촛점거리5,760mm 무게61 키로,
뉴토니안 겸용 카세그레인 망원경 입니다.
다카하시의 CN212 카세그레인/뉴토니안 경통에 영감을
얻어 자작을 하게 되었답니다.

역시 결론은 이만한 무게의 망원경을 무난하게 지탱해주는
1200마운트의 자랑이군요..ㅎㅎ

＊ 뼈대;The frame is the CPT18 (compact precision telescope) sold by Resource International, which was designed for a newtonian configuration.



＊ baffle;after the drawings were approved OMI went to work machining these parts, modifying some of the parts made by Resource International (the black anodized parts in the photos below) and making new ones (the shiny parts) where needed.





＊ 미러스팩 ;Mirror Material: Fine anneal Corning Pyrex.
Primary Mirror: 18” diameter F/4.2 paraboloid on  nominal 2” thick substrate.
Primary mirror clear aperture: 17.8” (Mirror diameter minus safety edge bevel.)
Secondary mirror: 6” diameter hyperboloid (3x amplification) on 1” thick substrate
Secondary mirror clear aperture: 5.66”
Focal length at Cassegrain focus: 226.8” (F/12.6)
Back focus: 14” nominal
Secondary and baffling to be designed to provide 1.66 (.4 degree) diameter fully illuminated field of view.
Wavefront quality at prime focus: <.2 wave P-V, <.05 wave RMS, >.97 Strehl ratio.
Wavefront quality at Cassegrain focus: <.25 wave P-V, <.07 wave RMS, >.90 Strehl ratio. All measurements take on the wavefront in auto-collimation at 633 nm. Interferometric certification to be supplied with optics set.



※ 완성된 모습;1200gto마운트의 28인치 11키로 무게추봉에
65키로 웨이트를 장착한 모습




※ 퍼스트라잇


＊18인치 자작 카세그레인과 STL 6303




결론:
Again, the AP1200GTO is doing a commendable job of handling this
heavy load. I was worried sick as to whether I had bit off more than
I could chew with this big and heavy scope on that mount, but it is
working just fine.

Thanks again to Astro-Physics for making such wonderful products that
are so conservatively rated.

Richard


자세한 내용은 아래 사이트 참고하세요

http://www.narrowbandimaging.com/cc18_page.htm