Summaron 35/2.8 screw mount

[jc_braconi]

Originally Posted by telewatt

.... ...wow...thats fine...

my Summicron 8 elements will work for the same?... I saw 3 screws...

regards,

Jan

Hi Jan,
Post a pict, please, of your lens, so WE can see these 3 screw....

[telewatt]

Hello Luigi and JC..

here is a picture of the lens.

there are only the 3 big screws...

Summicron-8-Linser-1.jpg

I'm not to happy to crew to much on this beauty!...


regards,

Jan

[Philippe D.]

Hallo Jan,

Originally Posted by telewatt

my Summicron 8 elements will work for the same?... I saw 3 screws...

I'm afraid not.

The ring-adapter (left) comes in a recessed space (blue arrow),
it is then fixed into place with a very small screw that comes here (red arrow).
The 3 screws you mean are those one (one of them here, green arrow).
Those screws should better not been unscrewed.

Summaron35.jpg

[Philippe D.]

Originally Posted by telewatt

there are only the 3 big screws...

If you don't see a very little one on the bottom ring (with the red dot), then you have an M bayonet lens.

[telewatt]

Thanks Philippe...!


o.k. no Summicron on my IIf... ..

regards,

Jan

[str]

Another picture with a 2.8/35 Summaron, you see the screw at the
bayonett:


screw.jpg


Stefan

[luigi bertolotti]

Originally Posted by telewatt

Thanks Philippe...!


o.k. no Summicron on my IIf... ..

regards,

Jan

Don't worry Jan... it's anyway a "8 elements Wetzlar"... a precious lens by its own... my one (1.971.xxx) does have the famous tiny screw, but I prefer not to dismount... is still an enjoyable lens on M8...
The screw mount items, seem to remember, were 500 or less..

[telewatt]

Originally Posted by luigi bertolotti

Don't worry Jan... it's anyway a "8 elements Wetzlar"... a precious lens by its own... my one (1.971.xxx) does have the famous tiny screw, but I prefer not to dismount... is still an enjoyable lens on M8...
The screw mount items, seem to remember, were 500 or less..

You are right Luigi... ..I love it...I have the ASPH too, but some time I prefer this on!

Regards,

Jan

[jc_braconi]

Jan,
I think everything was told, may be you can find one in the next days,
good luck

[echorec]

I am a little tempted to try this on my M3 Summicron too. The screw is there. Should I dismount the googles first then the little screw?

Thanks,

[doubice]

Originally Posted by echorec

I am a little tempted to try this on my M3 Summicron too. The screw is there. Should I dismount the googles first then the little screw?

Thanks,

Gunnar,

Before you start disassembling your Summicron - a few tidbits of information on the 35mm Summicron and f:2.8/35mm Summaron 'goggled' lenses.

They all focus to 70cm, even with the M3's rangefinder, which was only designed to focus to 1 meter. The goggles change the optical properties of the M3's finder to do this. To compensate for this, the rangefinder cam and internal focusing helicoid of all 'goggled' lenses are cut at a different angle - the lens will thus not couple to the rangefinder properly when the goggles are removed.

You might be able to 'guess focus' the lens but, on the examples that I tried, even the focusing scale sometimes did not match the actual distance once the goggles were removed.

You will of course not encounter this problem on any of the 'non-goggled' convertible (M to LTM) lenses. This is because their rangefinder cam and focusing helicoid are cut to work with all Thread Mount and M camera's rangefinders.

Hope it makes sense....

All the best,

Jan

[echorec]

Hello Jan,

That makes sense, maybe I should leave it as it is and just be happy with my Summaron "conversion".

Thanks,

[gyoung]

Originally Posted by doubice

Gunnar,

Before you start disassembling your Summicron - a few tidbits of information on the 35mm Summicron and f:2.8/35mm Summaron 'goggled' lenses.

They all focus to 70cm, even with the M3's rangefinder, which was only designed to focus to 1 meter. The goggles change the optical properties of the M3's finder to do this. To compensate for this, the rangefinder cam and internal focusing helicoid of all 'goggled' lenses are cut at a different angle - the lens will thus not couple to the rangefinder properly when the goggles are removed.

You might be able to 'guess focus' the lens but, on the examples that I tried, even the focusing scale sometimes did not match the actual distance once the goggles were removed.

You will of course not encounter this problem on any of the 'non-goggled' convertible (M to LTM) lenses. This is because their rangefinder cam and focusing helicoid are cut to work with all Thread Mount and M camera's rangefinders.

Hope it makes sense....

All the best,

Jan

Jan, how does that work with the original 35/3.5 Summaron for the M3, some of those had removable goggles so they would also work on the M2. Do they have the 'normal' cam and are thus not able to focus to 70cm on the M3?

Gerry

[doubice]

Hi Gerry,

Regards from Vancouver! I am sure you do not miss Montreal - over 2 meters of snow accumulation this winter……..

As to the goggled 3.5/35mm Summaron, even though that was my first 35mm lens on my first M3, I don’t recall how the cam worked with the goggles removed. The M2 was introduced after the discontinuance of the 3.5 Summaron so, I don’t think the goggle’s removeability (is that a word?) was there to allow the lens’ use on the M2. It was probably made that way just for ease of manufacture, even though in those years Leica did not care much about that…….

There also was a 3.5/35mm M mount Summaron without the eyes - it, like the goggled lens, keyed in the 50mm frame and was meant to be used on the M3 with an external shoe-mounted finder. That lens could be used on the M2 without any problems if one filed the frame actuating bayonet lug down - that would prevent any frames from being keyed in and the default frame on the M2 was 35mm. I am in the office and do not have access to my Leica ‘bibles’, so can’t tell how close the 3.5 Summaron focused with the goggles - the non-goggled one focused to 1meter.

Maybe Luigi will have a better answer?

All the best,

Jan

[jc_braconi]

You can only remove the goggles on the infinity position and when removed the focusing ring is blocked, if you want to unblocked it you have to push on the little ball.

I think that the possibility of removing the goggles was only made for easying the storing in case like the shell shaped one.

What is sure is when you use the 3.5 / 35 Summaron without the goggles on the M2 the viewfinder frame line set by the bayonnet cam is the one for the 50mm.

Same for the classic 3.5/35 (without goggles, to be used with the SBLOO viewfinder)

The only way to get the 35mm frame line is to use the 3.5/35 in screw mount version and use the adaptor ring for it.

[doubice]

Thanks, JC!

My memory was refreshed after reading your post. I do recall the little pin that was depressed when the goggles were slid into position and thus unlocked the focusing mount. Yes, the only reason for the goggles' removal was to make it easier to store the lens. It would not focus correctly without the goggles on any M Leica - that is why the focus was locked when the goggles were removed.

Basically the same idea as the locking system on the DR Summicron - you can only focus in the close range when the goggles are attached and cannot focus further than 1 meter with the goggles in place.

Best,

Jan

[gyoung]

Originally Posted by doubice

Thanks, JC!

My memory was refreshed after reading your post. I do recall the little pin that was depressed when the goggles were slid into position and thus unlocked the focusing mount. Yes, the only reason for the goggles' removal was to make it easier to store the lens. It would not focus correctly without the goggles on any M Leica - that is why the focus was locked when the goggles were removed.

Basically the same idea as the locking system on the DR Summicron - you can only focus in the close range when the goggles are attached and cannot focus further than 1 meter with the goggles in place.

Best,

Jan

Thanks both, I new the removal of the goggles locked the DR Summicron, but I hadn't remembered that it did on the Summaron. Its 40 years since I saw that version (in Montreal!). I am going to London in a couple of weeks, I shall take a very close look at the 2.8/35s on sale in case I can find an early M one with removable bayonet mount, the screw one gets a very high premium here in the UK.

It has been snowing here in England this weekend, not completely unknown but unusual this late.
Gerry

[echorec]

Picture taken with the IIIb + Summaron:

http://www.l-camera-forum.com/leica-...est-march.html