11-13-2017, 12:45 PM
I'd like to debate the question wether a phase detection or contrast detection AF needs more effort to deliver fast, yet precise focussing? On DSLR we use to have ultrasonic drives, which basically are fast and the precision comes from AF as the drives often countercorrect the primarily movement (at least in AF-C ).
In mirrorless, linear steppers or servos are often used. To increase their power, manufacturers use two or three of them in larger lenses.
The Fuji 100-400 is covering the range of a 150-600 on FF. Compared to it's bigger counterparts, it's more expensive - but not necessarily better. And on FF, the better primes like 300/2.8 are also no cheapos. This is only about FL equivalence - if one needs f/2.8 to avoid highest ISOs, the APS-C or µ4/3 f/2.8 gibes the same shutter speed as a FF f/2.8. A Canon EF 300/2.8 L is double the price of the Leica 200/2.8, so I think, the proportions need to be seen in the speed of the lens.
On Photography Life I read a couple of blog entries of Thomas Stirr, who's a big fan of Nikon series 1 like this one here https://photographylife.com/photographin...esentation
Maybe it's really time to see the benefits of smaller formats not only in terms of reduced weight and used bag space, but also the much easier DoF at reasonable apertures.
In mirrorless, linear steppers or servos are often used. To increase their power, manufacturers use two or three of them in larger lenses.
The Fuji 100-400 is covering the range of a 150-600 on FF. Compared to it's bigger counterparts, it's more expensive - but not necessarily better. And on FF, the better primes like 300/2.8 are also no cheapos. This is only about FL equivalence - if one needs f/2.8 to avoid highest ISOs, the APS-C or µ4/3 f/2.8 gibes the same shutter speed as a FF f/2.8. A Canon EF 300/2.8 L is double the price of the Leica 200/2.8, so I think, the proportions need to be seen in the speed of the lens.
On Photography Life I read a couple of blog entries of Thomas Stirr, who's a big fan of Nikon series 1 like this one here https://photographylife.com/photographin...esentation
Maybe it's really time to see the benefits of smaller formats not only in terms of reduced weight and used bag space, but also the much easier DoF at reasonable apertures.