ASPH? Are either of the Summarit-M 50mm f/2.4 & 75mm f/2.4 lens ASPH designated?

[Stonewall Brigade]

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Are either of the newest Summarit-M 50mm f/2.4 & Summarit-M 75mm f/2.4 lens ASPH designated?  I have both and have found conflicting data on the web.  I have also e-mailed Leica tech support but have not yet heard back. Thanks in advance for any replies.

[dugby]

The official Leica Technical Data sheets are the most likely source of accurate specifications.

 

https://au.leica-camera.com/Photography/Leica-M/M-Lenses/Summarit-M-50mm-f-2.4/Downloads

https://au.leica-camera.com/Photography/Leica-M/M-Lenses/Summarit-M-75mm-f-2.4/Downloads

 

All of my ASPH designated lenses have those characters imprinted on the lens rims.

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[TomB_tx]

It is consistently reported that of the Summarit-M. Lenses, only the 35 mm Has an ASPH element. It was not necessary on the others in order to get the required performance with the limited aperture. While Leica added the ASPH designation to the 35 mm 2.4, the earlier 2.5 had the same optics, just not stated as ASPH for marketing reasons to push buyers towards the more expensive lenses.

Edited August 12, 2016 by TomB_tx

[jcespite]

It is consistently reported that of the Summarit-M. Lenses, only the 35 mm Has an ASPH element. It was not necessary on the others in order to get the required performance with the limited aperture. While Leica added the ASPH designation to the 35 mm 2.4, the earlier 2.5 had the same optics, just not stated as ASPH for marketing reasons to push buyers towards the more expensive lenses.

http://www.imx.nl/photo/leica/lenses/lenses/page83.html

[jip]

The Leica Vario-Elmar-R 1:4/35-70 Macro also has an aspherical surface on one of it's lenses, the was also left out of the name to push people to the more expensive lenses.