|
Forum: Pentax News and Rumors
02-05-2015, 07:59 AM
|
| |
You mean the red ones; the dashed ones indicate meridional (as opposed to sagittal).
If I remember correctly, greater distance between the meridional and sagittal MTF curves indicates higher astigmatism, so it looks like the 150-450 may have more of that at the long end.
Another interesting thing to note is that the levels don't change all that much between the first and the second image in each pair (which I have to assume represent performance wide open and at f/8 respectively, in the absence of any other guidance), which would seem to indicate a fairly wide range of apertures that will give close-to-optimum sharpness.
But not having much experience with expensive telephoto lenses, I don't know how common that is in this class.
|
|
Forum: Pentax News and Rumors
02-04-2015, 09:29 PM
|
| |
I've seen a few posts quoting this now; everyone seems to be parsing it as:
Sensor system with reduced {movement and rotation compensation} system
Am I the only one who read it as:
Sensor system with {{reduced movement} and {rotation compensation}} system
where "reduced movement" is an awkward translation of what should have been "shake reduction"?
|
