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Leica Summaron-28

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If you look at a picture of the lens, you will see a little push-button on the end of the focus lever. When infinity is selected the infinity-lock will engage and the push-button needs to be depressed in order to move focus away from infinity.

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Oh, Thx. It's clear now to me. Indeed I have no M-lens with such a button to move away from infinity. 

A bit hard to understand what that should be good for. I understand it with heavy Canon lenses that get longer when not in infinity position. But why with this little lens? Anyway that is how it is. Maybe it is just because it was like that in 1955 already.

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28 minutes ago, Keith (M) said:

As it will be used on my MP, I'll have to make sure I do not get any 'analogue surprises'!  

My 35mm Summaron f2.8 & 5cm Summicron LTM both have infinity stops, so I'm well used to them.

Time to make a decision...

I hope so,

analog or digital surprises, with digits in the image, for example here, the Summaron-M 28 was used on the screenless M-D (typ 262),

I saw the "effect" later on and asked myself what these rose things at left could be ⁉️

 

to see later at home that those were my digits which were not on the focus lever (I see now what this lever is there for ... resting digits 😉)

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11 minutes ago, M10 for me said:

Oh, Thx. It's clear now to me. Indeed I have no M-lens with such a button to move away from infinity. 

A bit hard to understand what that should be good for. I understand it with heavy Canon lenses that get longer when not in infinity position. But why with this little lens? Anyway that is how it is. Maybe it is just because it was like that in 1955 already.

Most early Leica lenses have this feature, going back to 1925. It had two main purposes (a) to stop the lens moving around when transported and (b) then to hold the lens in focus at infinity. The current version of this lens is an M mount facsimile of the original LTM lens and, therefore, it has this feature. The only issue with using the LTM lenses with this feature is when using them with an adapter on an M mount camera where with some such lenses the focus lever can get stuck at infinity. However, I have used the original LTM mount version of this lens with an adapter on an M mount camera with no real issues.

William

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53 minutes ago, willeica said:

Most early Leica lenses have this feature, going back to 1925. It had two main purposes (a) to stop the lens moving around when transported and (b) then to hold the lens in focus at infinity.

It also facilitates removal of the lens from the body.

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I focus it by pushing in the button with my finger, thereby unlocking the lock if it is/becomes active and turning with the one finger, like using a tab. I use the locked button and the head of a small screw diametrically opposite to get a grip on the lens when mounting or unmounting it.

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I just started experimenting with my new-to-me, pre-owned Leitz Summaron 2.8cm lens. It had a recent, documented CLA by Leica North America, in New Jersey. First OOC JPEG impressions are good! 

This Summaron does render noticeably different than my Leica-M Elmarit 28mm, third version, designed by Walter Mandler. This difference is a good thing, to me. I would probably find a newest-version Elmarit-M 28mm ASPH to be less interesting than either.

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3 hours ago, ianman said:

It also facilitates removal of the lens from the body.

With some lenses, when the infinity stop tends to stick when mounted via an adapter on an M,  I take the knob to the minimum focus distance in order to mount and dismount the lens. We all have our own techniques which work for us.

William

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M10 | Summaron-M 1:5.6/28 | ISO 800 | f/5.6 | 1/60 sec

Chiang Mai - Empire of Signs
________________________
Frog Leaping photobook Edited by Nowhereman

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