Great thread, Raid !
Upon the advice of my photographer / collector mentor, my first LTM body & lens were a III-f and collapsible Summicron ( # 1,191,xxx ).
Soon after, I acquired a 1932 Leica D , with nickel Elmar, "11 o' clock Inf lock", # 99,xxx.
Last year I picked-up three Summars: 369,xxx (coated?); 228,xxx; and 312,xxx (with Leica III/ F, # 117,xxx).
These are the limit of my Leitz 5cm lenses...
I usually have the 'Cron on my "beater" III (1934); last month I was on a kick to shoot only black Leica with 1930's uncoated lenses, so my least-scratched Summar was pressed into service (not sure which # that would be as I type).
I also shot a roll with my 1932 D / nickel Elmar at a pre-1916 car-show in SE Pennsylvania.
I have been confining myself to Fujicolor 200 for consistency.
I noticed the nickel Elmar shots are all quite sharp, but "lacking in contrast"... it was a cloudy day, threatening rain. There also seemed to be some "haze" in the center of several shots, so there may be an issue with lubricant deposit on the interior surfaces.
The Summar offers a bit more contrast, but there are issues with flare, so a hood is a "must"... I use Summicron Barn-doors on an A-36 to E-39 filter adapter ring. I like the bokeh produced by the Summar.
I would like to get a nice Summitar, as well as a Sumamrit or a Xenon
(or both 😀).
I would also like to get a 2,5 Hektor 5cm to go on the D... but they don't turn-up too often.
The f/ 2.5 Hektor is described in the 1933 Leitz catalogue as "Universal lens of specially large aperture." 🙄
The same catalogue says this about the f/ 2 Summar: "Ultra-rapid lens, for all branches of amateur photography and exposures by artifical light."
Apparently there was a also non-collapsible Summar early-on.
By the time of the 1936 catalogue, the only 5 cm lenses available were the 3,5 Elmar and the collapsible Summar (available in nickel or Chrome).
I would imagine there were / are un-coupled versions of the 2,5 Hektor...
Has anyone found that slower or faster film speeds work best with un-coated lenses ? ( I have tried shooting Fuji color 400 or 800 with the uncoated lenses, and any gains from the additional speed seems to be countered by more grain than I would like ....)
Luddite Frank