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homemade Dall Kirkham and FDK from Korea

 

Han ( aka Immortal30) 

250mm F/L 2940mm

Yoon

http://www.sac-club.co.kr/xe/sp_photo_renew/337285

http://www.gogostar.kr/59/?q=YToyOntzOjEyOiJrZXl3b3JkX3R5cGUiO3M6MzoiYWxsIjtzOjQ6InBhZ2UiO2k6MTE7fQ%3D%3D&bmode=view&idx=4272185&t=board

fdk250:

http://www.astronet.co.kr/xe/index.php?mid=gallery_dso&menu_srl=61&listStyle=webzine&order_type=desc&category=104001&document_srl=238432

the corrector reducer is 4 elements in 3 groups

D=150mm, f=750mm, Flat-field Dall-Kirkham, 유준규님 자작품)

https://m.blog.naver.com/PostView.naver?blogId=williology&logNo=221611556984&categoryNo=1&proxyReferer=https:%2F%2Fwww.google.com%2F

https://m.blog.naver.com/PostView.naver?blogId=williology&logNo=222251345360&navType=by

https://m.blog.naver.com/williology/221878187891

https://m.blog.naver.com/hparksy/169779455

https://m.blog.naver.com/immortal30/220633180895

http://astrophoto.co.kr/astrophoto/239270

http://www.tofrom.kr:90/ex/index.php?mid=rnw&document_srl=86162

Fdk150. 

Spot size and sensor matching 

유준규 yunkyu yoo /   

joonkyu yoo

장승혁 Jang seung-hyuk / seunghyuk Chang

돌커크햄 Dall Kirkham

미러연마 mirror polishing

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