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Summicron-R 90 3rd version pre-APO same as 2nd version?
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PostPosted: Tue Mar 20, 2007 6:28 pm    Post subject: Summicron-R 90 3rd version pre-APO same as 2nd version? Reply with quote

I keep trying to figure out the various Leica lenses.

Is it true that Summicron-R 3rd version pre-APO (from 3381677) is optically an identical lens to the 2nd version, and that the difference is only in the filter thread?

And, I read on the chart that second version arrive until # 2770951 and third starts from 3381677, so what version are the numbers in between? (provided that there is any difference at all)

Very confusing!


PostPosted: Thu Jul 19, 2018 1:07 am    Post subject: Reply with quote

Anybody know?


PostPosted: Thu Jul 19, 2018 4:54 am    Post subject: Reply with quote

There's only 2 Summicron-R 90 versions, the APO and the pre-APO.

Pre-APO:
https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_Summicron-R
The pre-APO R 90 got a few changes during its long production run but not in the optical formula.

APO:
https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_APO-Summicron-R_ASPH

The confusion probably comes from the fact that the 'cron-M 90 III is closely related to the 'cron-R 90.
https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_Summicron-M_III

At intermediate apertures, the background bokeh of the R is smoother than that of the M-III version, due to differently shaped aperture blades. Both are superb lenses.


PostPosted: Fri Jul 20, 2018 9:13 pm    Post subject: Reply with quote

The index page for the R lenses shows only the 90/2 and 90/2AA
https://www.l-camera-forum.com/leica-wiki.en/index.php/R_Lenses_x_Focal_Length

There are however 3 versions of the 90/2 before the 90AA in the M line, which is probably the origin of the confusion.
https://www.l-camera-forum.com/leica-wiki.en/index.php/M_Lenses_x_Focal_Length

1- https://www.l-camera-forum.com/leica-wiki.en/index.php/Summicron_(I)_f%3D_9_cm_1:2

2- https://www.l-camera-forum.com/leica-wiki.en/index.php/Summicron_(II)_f%3D_9_cm_1:2

3- https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_Summicron-M_III

AA- https://www.l-camera-forum.com/leica-wiki.en/index.php/90mm_f/2_ASPH_Apo-Summicron-M