06-03-2010, 09:02 PM
[quote name='Rainer' date='03 June 2010 - 09:55 PM' timestamp='1275598508' post='156']
Can you "deabbreviate" this for me?
[/quote]
"Residual spherical aberrations" - the lens suffers from focus shifts when stopping down.
The focus information is obtained at max. aperture so it's slightly off at other settings. At close focus distances this is a relevant problem.
RSAs are not so uncommon in this class.
Can you "deabbreviate" this for me?
[/quote]
"Residual spherical aberrations" - the lens suffers from focus shifts when stopping down.
The focus information is obtained at max. aperture so it's slightly off at other settings. At close focus distances this is a relevant problem.
RSAs are not so uncommon in this class.