Summaron 35mm f2.8 M lens

[LocalHero1953]

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My Summaron LTM, bought from Scrapbook on this forum a while ago, (plus a SBLOO, a gift from Pyrogallol!). Although the s/n indicates it should be a 1960 M version according to the wiki, it has a minimum focus mark of 1m/3'4", so I assume it's an original screwmount. Marked German-made. It feels right at home on my Barnacks, though I occasionally switch to a W-Nikkor 3.5cm f/2.5 and, to be really minimalist on a Leica Standard (avoiding the external VF), a Summitar 5cm.

 

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Edited October 11 by LocalHero1953

[wlaidlaw]

My 1M/LTM 35/2.8 Summaron is serial number 1904816. I think that dates it to 1959. 

Wilson

[LocalHero1953]

33 minutes ago, wlaidlaw said:

My 1M/LTM 35/2.8 Summaron is serial number 1904816. I think that dates it to 1959. 

Wilson

1961 according to the wiki - if that is correct.

[UliWer]

46 minutes ago, LocalHero1953 said:

- if that is correct.

None of these lists are really  correct. Thiele gives 1960 for the batch with 1783xxx. And you never can be sure whether it is an original LTM or M version by the serial number. The minimal focal distance is much more indicative. People in the German forum have tested whether an M-version with the original adapter screwed off will focus correctly: it doesn't as the adapter fitted at the factory is different from the usual LTM-to-M-adapter. 

[wlaidlaw]

2 hours ago, LocalHero1953 said:

1961 according to the wiki - if that is correct.

You are correct Paul. I was getting confused with my LTM 50/1.5 Summarit, which is 1959 or just pre-Summilux. 

Wilson

[Jul]

11 hours ago, Sverker Ahrent said:

I have a Summaron 35mm 2.8 sn 19475**

I know it looks like I'm playing the lottery but is the serial 1947547
by chance?

[Jul]

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5 hours ago, UliWer said:

People in the German forum have tested whether an M-version with the original adapter screwed off will focus correctly: it doesn't as the adapter fitted at the factory is different from the usual LTM-to-M-adapter.

With all respect to the people who did the test, I do not believe the result. If you look side by side at an original LTM and a M summaron 35mm f2.8 with its adapter removed you will see their barrel is identical to the point that the LTM version base is (uselessly if used on a LTM body) machined as to fit in the adapter of the M version.

edit:

Maybe they tried with the M3 version, then the failure was expected.

Edited October 11 by Jul
complement

[wlaidlaw]

2 hours ago, Jul said:

With all respect to the people who did the test, I do not believe the result. If you look side by side at an original LTM and a M summaron 35mm f2.8 with its adapter removed you will see their barrel is identical to the point that the LTM version base is (uselessly if used on a LTM body) machined as to fit in the adapter of the M version.

edit:

Maybe they tried with the M3 version, then the failure was expected.

That is what I feel they meant, that you cannot unscrew the spectacles, leaving an M39 mm thread, which will mount on an LTM but cannot focus correctly, as the rangefinder expects to operate through correction lenses. 

Wilson

[LocalHero1953]

I've started a thread for images from this lens in the M lens subforum

[qqphot]

I have one of these "converted" LTM ones as well - the fit to the adapter is very tight but it can be removed with some effort and does focus correctly on a LTM body, unlike the ones that turn up on eBay having been removed from a goggled assembly. Mine (sn 1628150) is marked down to 0.7m/2.4ft though.  I wonder if earlier ones are 0.7m and later are 1m, or if there's no real pattern.

Edited October 24 by qqphot

[luigi bertolotti]

15 hours ago, qqphot said:

...Mine (sn 1628150) is marked down to 0.7m/2.4ft though.  I wonder if earlier ones are 0.7m and later are 1m, or if there's no real pattern.

All the BM (ungoggled) Summaron 2,8 do focus to 0,7m, even if, as yours, are built as LTM with factory adapter; only the "native" LTM Summarons have focus to 1m. Same situation also for Summicron 35 1st version... so, I think is not correct to say (one of the very few observation to Lager...) that those BM lenses are "built onto" the SM version... the scale is not the same, and, most of all, the focus helicoid is longer : at least, I think so... indeed, in theory the could have used the same helicoid, "blocking" its extension in some mech way in the SM versions: maybe some Forum member with experience in dismanting lenses could know something precise about.