Upload & Sell: Off
| p.22 #19 · Sony RX1 FF Mirrorless (fixed lens) |
Makten wrote:The E-mount is still larger than the M-mount, so I don't see the problem with FF. They probably chose the size to make very small cameras possible (the mount is taller than the NEX-5 body).
But at the same time, the M-mount has a longer flange distance, which puts the bottleneck further from the sensor plane, so the E-mount layout would be a challenge for telecentric lenses - which are, ironically, better suited to digital sensors, while the M system was designed around more symmetric lenses.
I don't understand this comment. Having a large mount makes it easier to design lenses, as does having the mount closer to the sensor. The Sony has the advantage in both places. If you want to design a long focal length lens, you simply move the elements further away from the sensor, super-easy, and no downside, other than size (which you saved in the first place by having a close mount).
Btw, I believe that tele centric lens design refers to making a lens *shorter* than its focal length would normally lead you to expect, given a classic design. I am guessing that you were referring to long focal length lenses.
Large mount, yes. Mount closer to the sensor, I think it depends on sensor size to mount ratio. To us an extreme example, imagine how hard it would be to to make a lens for a 35mm sensor in a 40mm diameter mount that is only 5mm away from the sensor. If the sensor is large compared to the mount throat diameter, and the mount throat is close the sensor, things start getting in the way, and you might have a very high angle of incidence. With an aps-c sensor in the e-mount, this doesn't seem to be an issue, but we'll see how the 35mm sensor does.
Telecentric lens design just means that the light rays come out of lens with at less of an angle when hitting the sensor. These tend to be more retrofocal and long.