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Sony FF mirrorless lens size
On Fri, 8 Apr 2016 15:59:11 -0400, PeterN
wrote: On 4/5/2016 11:57 PM, Eric Stevens wrote: On Tue, 05 Apr 2016 22:06:05 -0400, nospam wrote: In article , Eric Stevens wrote: If you check this article: http://www.fujix-forum.com/threads/w...-professional- mirrorless-was-a-fatal-mistake.54299/ the author is claiming that because the body is small, the lenses must be bigger to maintain the distance to the sensor. But is it perhaps because Sony is using an old lens design (suitable for DSLRs where the lens is further away from the sensor)? And if Sony used a different lens design, the lenses could be smaller (with the rear element closer to the sensor)? I don't think so. With any lens, except at the very center, light rays approach the sensor at an angle to the surface. The closer that the lens is to the surface, the greater that the angle will be. There is a limit to the angularity that a sensor will accept and hence a limit on how close to the sensor that the lens can be. what matters is the exit pupil of the lens, not the back focus distance. Yes, but keeping the exit pupil forward requires a longer lens, hence defeating the attempt to obtain a shorter lens. you're ignoring that the closer the exit pupil is, the smaller the coverage circle is. you're *not* going to get a 4mm lens covering full frame, for example, but that length is common on cellphone cameras. But so what? We are talking about full frame, not cellphone cameras. You seem to have an insatiable urge to feed trolls. I had stopped at that point. nospam has not replied. And now you pick up the thread. :-( -- Regards, Eric Stevens |
#22
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Sony FF mirrorless lens size
In article ,
PeterN wrote: On 4/5/2016 11:57 PM, Eric Stevens wrote: On Tue, 05 Apr 2016 22:06:05 -0400, nospam wrote: In article , Eric Stevens wrote: If you check this article: http://www.fujix-forum.com/threads/w...-professional- mirrorless-was-a-fatal-mistake.54299/ the author is claiming that because the body is small, the lenses must be bigger to maintain the distance to the sensor. But is it perhaps because Sony is using an old lens design (suitable for DSLRs where the lens is further away from the sensor)? And if Sony used a different lens design, the lenses could be smaller (with the rear element closer to the sensor)? I don't think so. With any lens, except at the very center, light rays approach the sensor at an angle to the surface. The closer that the lens is to the surface, the greater that the angle will be. There is a limit to the angularity that a sensor will accept and hence a limit on how close to the sensor that the lens can be. what matters is the exit pupil of the lens, not the back focus distance. Yes, but keeping the exit pupil forward requires a longer lens, hence defeating the attempt to obtain a shorter lens. you're ignoring that the closer the exit pupil is, the smaller the coverage circle is. you're *not* going to get a 4mm lens covering full frame, for example, but that length is common on cellphone cameras. But so what? We are talking about full frame, not cellphone cameras. You seem to have an insatiable urge to feed trolls. Some of them are cute! ;-p -- teleportation kills |
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