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The closest distance is so designed at 1m on Leica old interchangeable lenses some of the later model was 0.7m. On the other hand, those for SLR body were so done at 45cm on standard lenses. Range finder construction had some disadvantage on close distance because of paralux and measuring accuracy. These are why 1m closest distance was designed. Other rangefinder cameras were same as Leica.

I make it a rule to make this disadvantage into advantage without any irreversible modification, just an additive of an adequate extension tube. For example, Summitar extended 20 mm anteriorly could establish infinity focusing with its fuselage collapsed, without fuselage extension as normal use.

Then what will happen when the barrel was extended with extension tube? Yes, more close up shooting would be possible, 23cm distance like a macro lens!

As I show here, all the collapsible lenses could be utilized their performance shown here if an adequate length extension was applied, interesting don't you think?

Whenever I come across with some reports or impressions on old lenses especially made by Ernst Leitz Solms GMBh, I mourn and lament. The condition of object are not always well settled and maintained, they were not estimated their original and innate capability and potentials.
Mold and dust particles causing cloudiness and peeling of the edge lacquer can lead to poor image quality and the occurrence of flare and ghosting.
Consequently, we should restore them as original condition if we try to know their potentials fairly, of course the best care must be paied especially not to wipe out delicat and sbtle coating layer---difficult for layman.
The subtle differences in spherical aberration correction should be discussed under fair and correct establishment of any conditions. It is not an area that amateurs can easily enter.

Cold air pressure comes down from the Western Continent and cold weather are lasting in our country these days. On frozen road surface must be paid attention. Once start to slip all the vehicle fall into uncontrol.

My photo shooting hobby is inhibited this coldest season. Newly obtained equipment, Elmar 90mm/f4.0-Black lacquer painted no coating, Summitar 50mm/f2.0-square iris shape and M Rokkor 40mm/f2.0-similar with Summicron M 40mm/f2.0.

When it get warmer and the flowers bloom, things get busy.