View single post by Robert
 Posted: Wed Jan 31st, 2018 15:53
Robert



Joined: Sun Apr 1st, 2012
Location: South Lakeland, UK
Posts: 4066
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 A couple of drawings, the intended lens being my 16mm f2.8 fisheye. The red marks denote the field of view of the lens at horizontal.







The centre axis of the partial ring is at the nodal axis, both vertical and horizontal, the pan axis is taken care of by the length of the arm connecting the hub and the curved dovetail ring. That will be fixed for each camera, two arms, one longer for the D3 the other shorter for the D200 and D300.



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Robert.