joeq Posted February 10, 2011 Share #1 Posted February 10, 2011 Advertisement (gone after registration) what's it's purpose? thanks. Link to post Share on other sites More sharing options...
Advertisement Posted February 10, 2011 Posted February 10, 2011 Hi joeq, Take a look here little button under the thumb tab on a 35mm summilux. I'm sure you'll find what you were looking for!
ho_co Posted February 10, 2011 Share #2 Posted February 10, 2011 Unsure. Canadian Summilux? Is it a locking tab? Some earlier lenses would latch at infinity, and had a release catch built into the focusing tab. Maybe post a picture? Link to post Share on other sites More sharing options...
lct Posted February 10, 2011 Share #3 Posted February 10, 2011 Do you mean this? Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/143723-little-button-under-the-thumb-tab-on-a-35mm-summilux/?do=findComment&comment=1583420'>More sharing options...
lars_bergquist Posted February 10, 2011 Share #4 Posted February 10, 2011 Thumb tab? Are you reallly operating it with your thumb? Can we have a picture of your left hand? The old man with his thumbs in the middle of his hands Link to post Share on other sites More sharing options...
alexmann Posted February 10, 2011 Share #5 Posted February 10, 2011 Howard's right - that's the release switch from when it becomes locked on infinity. Regards Alex Link to post Share on other sites More sharing options...
Xmas Posted February 10, 2011 Share #6 Posted February 10, 2011 what's it's purpose? thanks. Your lens is pre '71 probably, it is the release of the latch at infinity, the latch is to allow you to spin on (or off) the lens with your thumb in the tab, without stressing the infinity setting mechanisms. The type I Elmarit 28m about the same vintage had one as well. Apparently Lars uses his middle fingger for this... Noel Link to post Share on other sites More sharing options...
joeq Posted February 10, 2011 Author Share #7 Posted February 10, 2011 Advertisement (gone after registration) i do - thanks all. Do you mean this? Link to post Share on other sites More sharing options...
ho_co Posted February 10, 2011 Share #8 Posted February 10, 2011 Boy, lct, that's a beauty in your picture! That Leitz chrome looks good, particularly the "ears" on the diaphragm ring. And the shaping of the 10(!) diaphragm blades to keep the aperture nearly circular. What an effort went into the esthetics as well as the production of the lenses of those days! Link to post Share on other sites More sharing options...
lct Posted February 10, 2011 Share #9 Posted February 10, 2011 Sure. Not bad for the tiny size. Funny to compare it to the CV 35/1.4 BTW. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/143723-little-button-under-the-thumb-tab-on-a-35mm-summilux/?do=findComment&comment=1583950'>More sharing options...
ho_co Posted February 10, 2011 Share #10 Posted February 10, 2011 I like the fact that both your caps have the 'feet' for removing the screw-to-bayonet adapter rings. Nothing like designing things for the real world, is there? Link to post Share on other sites More sharing options...
Rick Posted February 10, 2011 Share #11 Posted February 10, 2011 lct, I prefer the white balance and composition in the shot from post #9 over the last photo. The first shot is very well rendered and seen. Nice work. Link to post Share on other sites More sharing options...
lct Posted February 10, 2011 Share #12 Posted February 10, 2011 Mine is the second one i'm afraid. :D Link to post Share on other sites More sharing options...
lct Posted February 10, 2011 Share #13 Posted February 10, 2011 I like the fact that both your caps have the 'feet' for removing the screw-to-bayonet adapter rings... You teach this to me Howard. My only LTM lens is a CV 50/2.5 that i won in a contest and i never found the time or curiosity to buy an adapter for it (shame). Link to post Share on other sites More sharing options...
lars_bergquist Posted February 11, 2011 Share #14 Posted February 11, 2011 Apparently Lars uses his middle fingger for this... Noel Ah! suddenly the bell rings! "The thumb tab"! Joeq, you are using a "backhanded" left hand grip. You are supporting the camera with the right hand exclusively (making for an unsteady grip) while you grip the lens with the back of your left hand upward (so that you can enjoy the view of your fingers in the finder). In that case the left thumb does indeed fall on the focusing tab. But this is definitely the wrong grip for an M. It can pass with a SLR, where you are looking out at the world through the front lens, but not if your camera has a window finder. Support the camera in the flat of your left hand, the lens is held between your thumb to the left and your first finger, the tip of which falls in the hollow of the focus tab. Result: Easy, non-tiring and steady grip, easy focusing as you focus with your fingers and not with your wrist – and an unobstructed view. Imagine aiming a rifle ... The old man with his thumbs in the middle of his hands Link to post Share on other sites More sharing options...
Xmas Posted February 11, 2011 Share #15 Posted February 11, 2011 Hi Lars Nooooooooo When you moint or remove a lens you are only supposed to use the inner ring next to the body, with the infinity latch... You latch the lens at infinity, hold the body in either hand and use the other hand on the inner ring you can hold a thumb in the tab. If you dont use the inner ring you can damage lenses, even modern Leica ones. Zeiss in the ZM instruction manuals say dont use any but the inner ring... How you focus the lens is a personal thing, if I told you how I do it it would upset... Noel Link to post Share on other sites More sharing options...
lct Posted February 11, 2011 Share #16 Posted February 11, 2011 Only way to use a concave tab folks but YFingerMV Link to post Share on other sites More sharing options...
lars_bergquist Posted February 11, 2011 Share #17 Posted February 11, 2011 Hi Lars Nooooooooo When you moint or remove a lens you are only supposed to use the inner ring next to the body, with the infinity latch... You latch the lens at infinity, hold the body in either hand and use the other hand on the inner ring you can hold a thumb in the tab. Noel, I did not speak of mounting the lens, but of using it – the hand grip when making pictures. The old man with his thumbs in the middle of his hands Link to post Share on other sites More sharing options...
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