09-23-2010, 06:39 AM
[quote name='vc13130' timestamp='1285190524' post='3108']
I have an exposure issue with my Tamron 60 f/2 as well.
[/quote]
Are you sure this was really a aperture error? The Di 60 is a macro lens and it's common for F-mount macro lenses to report the effective aperture to the camera ... which increases with decreasing focus distance. So, what's wide open or f/2.2 at infinity becomes effectively f/2.8 (or even less) at close distances ... where closer starts at around 5 m, IIRC (sorry, can't test at the moment).
-- Markus
I have an exposure issue with my Tamron 60 f/2 as well.
[/quote]
Are you sure this was really a aperture error? The Di 60 is a macro lens and it's common for F-mount macro lenses to report the effective aperture to the camera ... which increases with decreasing focus distance. So, what's wide open or f/2.2 at infinity becomes effectively f/2.8 (or even less) at close distances ... where closer starts at around 5 m, IIRC (sorry, can't test at the moment).
-- Markus
Editor
opticallimits.com
opticallimits.com