07-07-2012, 07:18 AM
Hi Reinier,
very likely, the changes between the first and the second Make of the 28-105 USM will
not influence lensprofiles ... as you see here ...
http://www.canon.com/camera-museum/camera/lens/ef/data/standard_zoom/ef_28~105_35~45_usm.html?p=2
http://www.canon.com/camera-museum/camera/lens/ef/data/standard_zoom/ef_28~105_35~45ii_usm.html?p=2
... the optical construction is the same.
There is a change in the number of aperture blades (5 -> 7) which eventually makes a difference
for bokeh (and vignetting?).
To see, if the profile of the 24-105 is simillar to the one of the 28-105 (personally, I doubt it), you could try
PTlens ( http://www.epaperpress.com/ptlens/ ). The testversion 10 conversions ... if you convert
the same picture at 28, 35, 50, 80 and 105 with both profiles, you will see the difference or you
will see that the difference is "small enough".
Just a thought ... Rainer
very likely, the changes between the first and the second Make of the 28-105 USM will
not influence lensprofiles ... as you see here ...
http://www.canon.com/camera-museum/camera/lens/ef/data/standard_zoom/ef_28~105_35~45_usm.html?p=2
http://www.canon.com/camera-museum/camera/lens/ef/data/standard_zoom/ef_28~105_35~45ii_usm.html?p=2
... the optical construction is the same.
There is a change in the number of aperture blades (5 -> 7) which eventually makes a difference
for bokeh (and vignetting?).
To see, if the profile of the 24-105 is simillar to the one of the 28-105 (personally, I doubt it), you could try
PTlens ( http://www.epaperpress.com/ptlens/ ). The testversion 10 conversions ... if you convert
the same picture at 28, 35, 50, 80 and 105 with both profiles, you will see the difference or you
will see that the difference is "small enough".
Just a thought ... Rainer