"Umm what's a portrait unar look like (design-wise)?"
the Portrait Unar has the same layout as an Unar, with a moving second element. If it is an Unar than the rear cell would work alone as a really soft focus, slightly shorter FL lens.
"Umm what's a portrait unar look like (design-wise)?"
the Portrait Unar has the same layout as an Unar, with a moving second element. If it is an Unar than the rear cell would work alone as a really soft focus, slightly shorter FL lens.
UNAR but for reversal of rear two elements but there was a T. T. & H. f 2.5 lens that had the simple back of the Triplet replaced by two glasses. "OPTICS" by Arthur Cox, Seventh Edition, page 163, discussed page 162. If this is it, this is a credible drawing.
Bernie Kaye
And I believe an unar would be good for .... ?
I'm not in a position to test it yet. The local machinist is upgrading his CAD lathe.
Thanks all.
Sincerely, Good for fun & joy in taking pictures.
Bernie
In the Cox book Optics, the drawing of the TTH on page 163 is remarkably close to your drawing.
Bernie
In "A History of the Photographic Lens," by Rudolph Kingslake, Academic Press, Inc., Copyright 1989, (not revised book to be issued perhaps January 10th,) on pages 108-110 is discussion and diagram of The Speedic Lens by H. W. Lee, that also was in the Cox book that I mentioned on January 3rd, same perhaps as yours. You may have an unusual if not rare lens.
Bernie Kaye
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