03-15-2011, 03:55 AM
[quote name='Brightcolours' timestamp='1300112348' post='6756']
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".
[/quote]
Yes, then it seems that the TC-17e II is more appropriate.
Currently I have the following lenses: AF-S 16-35 f4G vr, AF 24-85 f2.8-4D, AF 80-200 f2.8D, AF 50 1.8D, AF 85 1.8D. If the AF 80-200 f2.8D were not too heavy for travel I would not consider another long FL lens.
If the 70-300vr is soft in the range 200-300mm as many have said, then I am not very interested in buying it since then it will add little to my lens set.
So far it seems the AF 105 f2.8 vr macro is the most appropriate one to consider. It is a very good macro lens, has vr and a not so big weight, and with TC-17e II I will have too Fls: 105 and 180.
Many thanks to all who have given me valuable advices.
Frank
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".
[/quote]
Yes, then it seems that the TC-17e II is more appropriate.
Currently I have the following lenses: AF-S 16-35 f4G vr, AF 24-85 f2.8-4D, AF 80-200 f2.8D, AF 50 1.8D, AF 85 1.8D. If the AF 80-200 f2.8D were not too heavy for travel I would not consider another long FL lens.
If the 70-300vr is soft in the range 200-300mm as many have said, then I am not very interested in buying it since then it will add little to my lens set.
So far it seems the AF 105 f2.8 vr macro is the most appropriate one to consider. It is a very good macro lens, has vr and a not so big weight, and with TC-17e II I will have too Fls: 105 and 180.
Many thanks to all who have given me valuable advices.
Frank