robb Posted 4 hours ago Share #1 Posted 4 hours ago Advertisement (gone after registration) Which M lenses have the least focus breathing for use on cine? modern asph designs? 1980-2000 designs? older classics? Thanks for any thoughts. Robb Link to post Share on other sites More sharing options...
Advertisement Posted 4 hours ago Posted 4 hours ago Hi robb, Take a look here M Lens Focus Breathing. I'm sure you'll find what you were looking for!
adan Posted 2 hours ago Share #2 Posted 2 hours ago (edited) Well, the term "focus breathing" has been used confusingly to mean two opposite things - but assuming you mean "lenses without focus-breathing do NOT show FoV changes as they focus closer or farther"- probably no M lenses at all. It is well-known, for example, that unit-focusing lenses (all the elements move together as one unit) change the field of view the more they are extended. And the "fixed-area" M framelines make this obvious. The lines are only perfectly accurate at one focus distance (which has varied over the decades, but is currently 2 meters/6.6 feet). As I documented when questions arose at the intro of the M10. Example pictures made with the 75mm APO-Summicron-M. This lens clearly "breathes" when focused at different distances. 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! Most lenses that avoid focus-breathing use internal focus - the lens overall does not move or change length, just the glass elements inside, sliding around relative to one another. The SL lenses being an example (and quite possibly the S and Q also). But internal focusing does not work with the M's rangefinder system - which counts on the total movement of the whole lens and its RF cam, to align the double-images in the RF patch. So M lenses do not use internal focusing. At most they have slightly-moving "floating elements" to improve image quality (not size/magnification) when focused close. OTOH, wide-angle unit-focusing lenses move LESS than long focal lengths. And therefore the wider the lens (18-24-21mm, or the "zoom" 16-18-21), the less focus breathing will occur. A 21mm unit-focus lens may only move a couple of mm to focus all the way from infinity to 0.7m (changing the field of view, or "breathing," only slightly), while a 135mm may move (and "breathe") ~10 times as much. Edited 2 hours ago by adan Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! Most lenses that avoid focus-breathing use internal focus - the lens overall does not move or change length, just the glass elements inside, sliding around relative to one another. The SL lenses being an example (and quite possibly the S and Q also). But internal focusing does not work with the M's rangefinder system - which counts on the total movement of the whole lens and its RF cam, to align the double-images in the RF patch. So M lenses do not use internal focusing. At most they have slightly-moving "floating elements" to improve image quality (not size/magnification) when focused close. OTOH, wide-angle unit-focusing lenses move LESS than long focal lengths. And therefore the wider the lens (18-24-21mm, or the "zoom" 16-18-21), the less focus breathing will occur. A 21mm unit-focus lens may only move a couple of mm to focus all the way from infinity to 0.7m (changing the field of view, or "breathing," only slightly), while a 135mm may move (and "breathe") ~10 times as much. ' data-webShareUrl='https://www.l-camera-forum.com/topic/425655-m-lens-focus-breathing/?do=findComment&comment=5898612'>More sharing options...
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