75mm Summarit f/2.4 quality at 0.7 meters

[adan]

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Title mostly says it.

 

I'm curious how the 75 f/2.4 performs at the new close focus limit of 0.7 meters. Does it lose resolution, as do most non-macro lenses, when pushed below 1 meter? The 75 Summicron does beautifully, but has a floating element specifically to achieve that.

 

Many other lenses that are superb at long range get weaker near the close-focus limit (90 voigtlander APO, 50 Summilux pre-ASPH 0.7-meter version, 90 Summicron APO) - which is just a fact of optical life. But I wondered how the Summarit holds up at f/2.4, or stopped down. (I've loved the f/2.5 at longer ranges, but it is, or course, physically limited to .9 meters).

[machmaphoto]

adan I did a non scientific try-out with my Summarit 2,4/75mm this morning.

 

1. Camera Sony A7 on a Stativ.

2. Distance camera metered 70cm.

3. Distance on lens 0,7m.

4. Lens wide open 2,4.

5  DNG RAW Converter position "neutral".

6. Sharpening at zero.

7. No sharpening in downsizing.

 

What You see is what you get and what i knew before. 

 

A known very light vignetting which is because of overall brightness nearly not to see here and is in any case diminishing if you close to about 2,8.

 

For me resolution is enough to astonishing.

 

The books are perhaps 2-3 mm not in focus because it was impossible for me to move the stativ so correctly. You see this with the book Günther de Bruyn that causes a slight shadow to the right because it is not exactly in the row and therefore  mm out of focus.

 

I stay tuned what others will tell and show.

 

Hello from Berlin.

 

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