Han ( aka Immortal30)
250mm F/L 2940mm
Yoon
http://www.sac-club.co.kr/xe/sp_photo_renew/337285
fdk250:
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=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
Spot size and sensor matching
유준규 yunkyu yoo /
joonkyu yoo
장승혁 Jang seung-hyuk / seunghyuk Chang
돌커크햄 Dall Kirkham
미러연마 mirror polishing
留言
張貼留言