10-08-2013, 09:00 PM
I'm just experimenting a bit with my Fuji x100 and some
screw-on teleconverters. Most will lead to heavy vignetting,
but some interestingly do not vignette at all. Nevertheless,
even most of those that do not vignette have poor borders
an very pronounced pincusion distortion along with heavy CA.
I do not have a PTlens-profile for any of my test-objects, but
eventually I can get along for now if I use the profile of a
completely different lens that also produces strong pincushion
distortion.
So far, my best find is the Canon EF 70-300 (non L , non DO)
at 300mm on fullframe. (2.58%) ... I need to apply this profile
two times (which already overcompensates a little).
Anyone of you knows a lens that has more pincushion distortion
(regardless of camera system and sensorformat or lens and
focallength)? I just want to try some other PTlens profiles
in order to check if a converter along with stopping down and
correction of the distortion and CA might serve as a 50 - 80mm
substitute for the x100.
Rainer
screw-on teleconverters. Most will lead to heavy vignetting,
but some interestingly do not vignette at all. Nevertheless,
even most of those that do not vignette have poor borders
an very pronounced pincusion distortion along with heavy CA.
I do not have a PTlens-profile for any of my test-objects, but
eventually I can get along for now if I use the profile of a
completely different lens that also produces strong pincushion
distortion.
So far, my best find is the Canon EF 70-300 (non L , non DO)
at 300mm on fullframe. (2.58%) ... I need to apply this profile
two times (which already overcompensates a little).
Anyone of you knows a lens that has more pincushion distortion
(regardless of camera system and sensorformat or lens and
focallength)? I just want to try some other PTlens profiles
in order to check if a converter along with stopping down and
correction of the distortion and CA might serve as a 50 - 80mm
substitute for the x100.
Rainer