a.noctilux Posted September 2, 2019 Share #21 Posted September 2, 2019 Advertisement (gone after registration) In my lens use, I'm very sensible to that subtle "aperture shape" in the final pictures. Sometimes with surprise in Leica M use with exotic lenses that I happen to mount on them. With SLR or mirrorless (M with Liveview can do ), we can see/preview their effects before taking the picture. Some "contre-jour" can show also the aperture shape. Sun stars are other secondary effects with double-number the branches for odd number of blades. This is example of six-blade (common in SLR lenses like this F-E Takumar), sun stars and hexagonal reflection spots 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! Leica Monochrom with Pentax F-E 4/17mm I didn't "see" those effects before reviewing the picture, without LV on MM1 only did "imagine" that they are on the picture Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! Leica Monochrom with Pentax F-E 4/17mm I didn't "see" those effects before reviewing the picture, without LV on MM1 only did "imagine" that they are on the picture ' data-webShareUrl='https://www.l-camera-forum.com/topic/300869-lenses-with-circular-aperture-at-all-stops/?do=findComment&comment=3811705'>More sharing options...
Advertisement Posted September 2, 2019 Posted September 2, 2019 Hi a.noctilux, Take a look here Lenses with circular aperture at all stops. I'm sure you'll find what you were looking for!
evikne Posted September 2, 2019 Share #22 Posted September 2, 2019 (edited) @adan Thank you for the thorough explanation of aperture design! But I would gladly accepted a thicker lens if that's what it takes for a nicer bokeh. At least for a 50mm. 😉 Edited September 2, 2019 by evikne Link to post Share on other sites More sharing options...
NigelG Posted September 2, 2019 Share #23 Posted September 2, 2019 Maybe Leica need to get Miyazaki Sadayasu on the case - the 73 f1.5 has "disappearing" blades.....(it's an optical illusion I know but they seem to appear from nowhere.) . 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! 3 3 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/300869-lenses-with-circular-aperture-at-all-stops/?do=findComment&comment=3811845'>More sharing options...
Michael Geschlecht Posted September 3, 2019 Share #24 Posted September 3, 2019 Hello Everybody, Leitz & other lens makers went to 6 or so diaphram blades when they started manufacturing lenses that stopped down to the preset aperture when a person pushed the shutter release. 1 of the reasons for doing this was the complexity of the mechanisms involved: Less parts to move: Less to potentially go wrong. And less effort along with a smoother shutter release. Best Regards, Michael Link to post Share on other sites More sharing options...
evikne Posted September 3, 2019 Share #25 Posted September 3, 2019 On 9/2/2019 at 4:39 PM, NigelG said: Maybe Leica need to get Miyazaki Sadayasu on the case - the 73 f1.5 has "disappearing" blades.....(it's an optical illusion I know but they seem to appear from nowhere.) . 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! Magic! 🤩 Link to post Share on other sites More sharing options...
Gregm61 Posted September 4, 2019 Share #26 Posted September 4, 2019 I have a 135mm f4 Elmar from the 1960’s, a beautiful example and the aperture mexhanism is pretty darn close to perfectly round across the range. Link to post Share on other sites More sharing options...
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