[quote name='Brightcolours' timestamp='1294071231' post='5321']
We can see here that it is NOT the optical design... so it must be that the aperture is not correct. Have you checked exposure durations?
[/quote]
That was my idea, too. In fact, the aperture not fully closing is the only reason that seems to make sense. However, I checked durations and "unfortunately" they are flawless:
f/5.6: 1/40s
f/8.0: 1/20
f/11: 1/10
f/16: 1/5
f/22: 1/2.5
The resulting files show no shift in exposure (f/22 files aren't any brighter).
Honestly, I'm absolutely clueless about the reason for the high f/22 resolution. Will be interesting to see if the lens shows the same behaviour on the D7000.
-- Markus
We can see here that it is NOT the optical design... so it must be that the aperture is not correct. Have you checked exposure durations?
[/quote]
That was my idea, too. In fact, the aperture not fully closing is the only reason that seems to make sense. However, I checked durations and "unfortunately" they are flawless:
f/5.6: 1/40s
f/8.0: 1/20
f/11: 1/10
f/16: 1/5
f/22: 1/2.5
The resulting files show no shift in exposure (f/22 files aren't any brighter).
Honestly, I'm absolutely clueless about the reason for the high f/22 resolution. Will be interesting to see if the lens shows the same behaviour on the D7000.
-- Markus
Editor
opticallimits.com
opticallimits.com