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Interesting articles, thanks. Not sure what exact spacing to sensor from second reducer but looking at side of house brick wall today there was only a very small dark triangle in each corner which is the cone of light.
The sides, top and bottom view was full view. So I think I guessed the spacing nearly spot on. Will also be interesting on sharpness and coma as more glass. I will take photo with 1 reducer then 2 reducers and post.
Regards
Kon
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