APO lens 50mm & 75 mm

[Al_OOF]

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I ...but being lifelike belongs to few lenses in the world.

I saw this at Voigtlander 125mm apo,coastal 60mm,zeiss otus and zeiss 135mm f2.Leica has this only at 50mm apo and 24mm elmar f3.8.(this is my opinion of course)

If I can add my experience I see this also in my Summilux 35 asph (pre FLE)

Regarding the 75 AA any thought about what is written about it in "Leica Lens Compendium" ?

"The particular strong point of this lens is its stunning propensity to show the depth of the subject with a three dimensional quality that is seldom encountered"

I have seen many comments about its sharpnes but quite nothing about this...

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[colonel]

Leica lenses can be easily compared using the Leica pocket book.

 

My version does not have the 50mm apo but the benchmark for Leica lenses is and has always been for some time the 90mm apo.

 

The 75mm apo is based on the lens group of the 50mm f1.4 ASPH with some changes. It is a very good performer but is clearly not as good as the 90mm apo or the 135mm apo

 

Note that this is about sharpness and contrast. Draw and colours are something else

 

I would be interested to see the latest pocket book if it has the 50mm apo

[Jeff S]

 

... but the benchmark for Leica lenses is and has always been for some time the 90mm apo….

 

….Note that this is about sharpness and contrast. Draw and colours are something else

 

 

Erwin Puts rates the 90 Macro-Elmar-M above the 90 Apo-Summicron-M, citing the latter's only weaker point as "its performance at closer distances (0.7 - 2m)…here we see some softness and lack of contrast."

 

His 'benchmark' list (in his Leica Chronicle), apart from the 90 Macro-Elmar, includes the 21 Super Elmar ASPH, the 135 APO-Telyt-M, and the 50 APO Summicron-M. The 90 APO Summicron doesn't make his cut, calling it "the second best in class of 90mm lenses for the M system." He calls the Macro-Elmar "simply the best general purpose 90 mm lens in the current M range."

 

I don't personally believe in all-encompassing subjective ratings…each tools for a specific task…but since you took the leap...

 

Jeff

[colonel]

Erwin Puts rates the 90 Macro-Elmar-M above the 90 Apo-Summicron-M, citing the latter's only weaker point as "its performance at closer distances (0.7 - 2m)…here we see some softness and lack of contrast."

 

His 'benchmark' list (in his Leica Chronicle), apart from the 90 Macro-Elmar, includes the 21 Super Elmar ASPH, the 135 APO-Telyt-M, and the 50 APO Summicron-M. The 90 APO Summicron doesn't make his cut, calling it "the second best in class of 90mm lenses for the M system." He calls the Macro-Elmar "simply the best general purpose 90 mm lens in the current M range."

 

I don't personally believe in all-encompassing subjective ratings…each tools for a specific task…but since you took the leap...

 

Jeff

 

Yes it could be subjective, thanks for that

however the MTA curves in the pocket book are quite clear. In fact the 135mm and 90mm are near identical.

 

The short focal lengths are not really comparable to the long ones as their curves never compare but I guess it's amongst the FL peer group

[Jeff S]

If 75mm APO is based on 50mm Summilux, is 50mm Lux APO as well, just not marketed as such (APO)?

 

David Farkas commented on a discussion with Peter Karbe in this 2008 interview report that it is indeed. An excerpt…

 

I asked if the design was the same why the 75 was an APO lens and the 50 wasn’t. Here is a bit of a shocker… the 50 lux ASPH is an APO lens, containing an APO correction element. But, he thought the idea of an APO 50 was a bit silly so they never put it on the lens or in any marketing materials.

Some of the more technical minded members here, however, have disputed that the Summilux is 'fully' APO. Fast forward 6 years, and it's clearly no longer considered 'silly' to describe and market the truly APO 50 Summicron.

 

Jeff

[mirekti]

Thanks for replying, Jeff. I deleted my post as I realized there was already an answer to my question within the thread.

 

The reason I checked this thread was to confirm the design of 75mm APO was based on 50mm Summilux. The cause was poor resolving power of 75mm on this site http://www.lenscore.org/ Not sure one can rely on their results, though.

[algrove]

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Shot with M9 and Apo-Summicron-M 75mm f/2 ASPH. @ f/2, ISO 1250. 1/180 s.

[ATTACH]447705[/ATTACH]

 

No de lamination on this image it seems.

[tobey bilek]

" the 50mm Summilux is also APO-corrected" and "the 50 1.4 which is supposedly APO but not in the name"

 

Where does one get such info? I am relatively new to the Leica world and have never read that before. There are lots I do not know, But admit I am incredulous. Why would Leica keep such information secret?

 

Came from the designer on a video posted by Leica. I checked the cross sections of the elements between the 50 1.4 & 75 APO and they are similar if not the same, simply larger elements. I do not believe they are still up on Leica`s site.