Timeline for What is the advantage of a lens with a curved focal plane?
Current License: CC BY-SA 3.0
13 events
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| Oct 4, 2019 at 9:12 | comment | added | user82065 | One interesting thing to look at with regards to this would be: what do the focal 'planes' of good rangefinder lenses look like? Because with a rangefinder you have no real option other than focus and recompose, and there are rangefinder-specific lenses of very high quality. So if they tend to be approximately spherical that would be interesting. | |
| Dec 19, 2016 at 18:20 | comment | added | db9dreamer | @MichaelClark I value your stamp of approval as highly as I do your other contributions to the site. | |
| Dec 16, 2016 at 20:47 | comment | added | Michael C | @dav1dsm1th Well, just because they're not perfectly flat doesn't mean they're perfectly spherical either. They're usually an irregular wavy shape somewhere in between. But please continue to think my (perhaps incorrectly perceived by you) stamp of approval regarding how well your answer actually answers the question that was asked is such a valuable badge of honor. | |
| Nov 28, 2016 at 21:25 | comment | added | db9dreamer | Again, thanks for confirming my answer is correct @MichaelClark | |
| Nov 28, 2016 at 6:35 | comment | added | Michael C | @dav1dsm1th All lenses have field curvature until they're corrected for it to one degree or another. There is no refractive lens with a theoretically flat field of focus. The fact that most modern lenses get close enough that we don't notice doesn't mean lenses inherently have a flat field of focus, it just means we're getting pretty good at making lenses that look like they do. | |
| Sep 23, 2016 at 22:30 | comment | added | db9dreamer | I have no idea @PhilipKendall | |
| Sep 23, 2016 at 20:36 | comment | added | Philip Kendall♦ | @dav1dsm1th How many lenses have the truly spherical field of focus which is required for focus+ recompose to work? | |
| Sep 23, 2016 at 15:20 | comment | added | db9dreamer | Thanks for confirming my answer is correct @MichaelClark | |
| Sep 23, 2016 at 15:17 | history | edited | db9dreamer | CC BY-SA 3.0 |
made answer specific to spherical focal plane (as per the question)
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| Sep 23, 2016 at 11:53 | comment | added | Lee Saxon | Agree with Michael. More than the multi-point AF comment, there's the problem that the exact shape of this curvature varies wildly between lenses and the chances of the trigonometry actually matching up for this to work are astronomical. | |
| Sep 23, 2016 at 3:14 | comment | added | Michael C | What you say is correct, but I doubt that's a primary consideration for why most shooters who choose to use such a lens do so. With multi-point AF systems that cover much of the FoV and live view focusing that covers the entire frame, focus and recompose is no longer needed to near the extent it was when manual focus aids were only in the center of the viewfinder. | |
| Sep 22, 2016 at 19:47 | history | edited | db9dreamer | CC BY-SA 3.0 |
typo in embedded image
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| Sep 22, 2016 at 16:06 | history | answered | db9dreamer | CC BY-SA 3.0 |