03-14-2011, 02:19 PM
[quote name='Frank' timestamp='1300108900' post='6751']
Hi Markus:
How is the combination AF-s 105 2.8vr + TC-14E II? I guess that the larger magnification the more loss of image quality so could this combination give better quality than AF-s 105 2.8vr + TC-17E II?
Frank
[/quote]
It is true that the bigger the focal length multiplication is, the bigger the impact is on at least the resolution of the lens. A tele converter crops the optics of the lens, you "smear" the resolving power of the center of the lens over a bigger area of the sensor.
With 2x TC's often you get a clear resolution hit, only with the sharpest of lenses you do not really notice this. With good 1.4x TC's results with a sharp lens usually still give a sharp impression. 1.7x TC's are a nice compromise between 2x and 1.4x TC's.
The 1.4x TC will make the 105mm f2.8 into an 147mm f4 lens... not sure if that is long enough for you, that is for you to decide. Macro lenses take longer to focus than average, due to a longer (more precise) focus path. Try one to see if this will impact your enjoyment when using it as moderate tele or not.
I have a 1.7x TC from Soligor myself, and on my Tamron 90mm 2.8 it delivers sharp enough results (on 12mp APS-C). On my 70-200 f4, wide open, it starts to be noticeably "soft".
Hi Markus:
How is the combination AF-s 105 2.8vr + TC-14E II? I guess that the larger magnification the more loss of image quality so could this combination give better quality than AF-s 105 2.8vr + TC-17E II?
Frank
[/quote]
It is true that the bigger the focal length multiplication is, the bigger the impact is on at least the resolution of the lens. A tele converter crops the optics of the lens, you "smear" the resolving power of the center of the lens over a bigger area of the sensor.
With 2x TC's often you get a clear resolution hit, only with the sharpest of lenses you do not really notice this. With good 1.4x TC's results with a sharp lens usually still give a sharp impression. 1.7x TC's are a nice compromise between 2x and 1.4x TC's.
The 1.4x TC will make the 105mm f2.8 into an 147mm f4 lens... not sure if that is long enough for you, that is for you to decide. Macro lenses take longer to focus than average, due to a longer (more precise) focus path. Try one to see if this will impact your enjoyment when using it as moderate tele or not.
I have a 1.7x TC from Soligor myself, and on my Tamron 90mm 2.8 it delivers sharp enough results (on 12mp APS-C). On my 70-200 f4, wide open, it starts to be noticeably "soft".